You searched for subject:(Postharvest).
Showing records 1 – 30 of
402 total matches.
◁ [1] [2] [3] [4] [5] … [14] ▶
Massey University
1.
Doleh, Leila.
Curing kiwifruit : physical, physiological and storage impacts.
Degree: M. Phil., Food Technology, 2018, Massey University
URL: http://hdl.handle.net/10179/14696 
► Curing of ‘Hayward’ kiwifruit is a postharvest approach to reduce decay and maintain quality during long-term storage. Curing occurs immediately after harvest, with fruit placed…
(more)
▼ Curing of ‘Hayward’ kiwifruit is a postharvest approach to reduce decay and maintain quality during long-term storage. Curing occurs immediately after harvest, with fruit placed in picking bins in a covered packhouse space for a few days. Curing contributes to fruit quality by allowing the picking scar to heal (resulting in reduced Botrytis rot) and allows a proportion of
water loss, resulting in fruit cells that are less turgid and hence less prone to mechanical damage during packing. In the contemporary packhouse, curing is also used to buffer logistical challenges, since stockpiling fruit has advantages in ensuring the packing line continues to process fruit. In kiwifruit, the rates of cooling to storage temperature have previously been
identified as an influence on long-term storage outcomes, including firmness and storage breakdown development (SBD). Little is known about how curing contributes to long-term storage, yet there is potential to impact post-storage fruit quality given that curing occurs immediately prior to packing and cooling. There is a lack of knowledge regarding the range of conditions which fruit are exposed to when bins are stacked under non-controlled conditions. It is also unknown how these conditions may influence fruit quality (i.e. fruit softening and SBD development) after long-term storage. This thesis incorporates monitoring of within bin environmental conditions to assess possible in-stack heterogeneity during curing.
Subjects/Keywords: Kiwifruit;
Postharvest losses;
Prevention;
Postharvest physiology;
Storage
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Doleh, L. (2018). Curing kiwifruit : physical, physiological and storage impacts. (Masters Thesis). Massey University. Retrieved from http://hdl.handle.net/10179/14696
Chicago Manual of Style (16th Edition):
Doleh, Leila. “Curing kiwifruit : physical, physiological and storage impacts.” 2018. Masters Thesis, Massey University. Accessed January 16, 2021.
http://hdl.handle.net/10179/14696.
MLA Handbook (7th Edition):
Doleh, Leila. “Curing kiwifruit : physical, physiological and storage impacts.” 2018. Web. 16 Jan 2021.
Vancouver:
Doleh L. Curing kiwifruit : physical, physiological and storage impacts. [Internet] [Masters thesis]. Massey University; 2018. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10179/14696.
Council of Science Editors:
Doleh L. Curing kiwifruit : physical, physiological and storage impacts. [Masters Thesis]. Massey University; 2018. Available from: http://hdl.handle.net/10179/14696
Massey University
2.
Franklin, Deena Kelsey.
Characterising texture and cellular level responses of 'Centurion' blueberries during storage in different weight loss conditions.
Degree: Master of Food Technology, 2019, Massey University
URL: http://hdl.handle.net/10179/15461
► Postharvest blueberry softening hinders consumer acceptance and correlates with high moisture loss during storage. Such textural variations have been attributed to factors such as turgor,…
(more)
▼ Postharvest blueberry softening hinders consumer acceptance and correlates with high moisture loss during storage. Such textural variations have been attributed to factors such as turgor, cell wall modifications and other microstructural changes in the outer cell layers of the fruit. This thesis investigated the impact of moisture loss on blueberry quality, as well as the structure/function relationships associated with fruit texture characteristics during postharvest using an integrated physical and microstructural approach.
Four different weight loss conditions (62%, 76%, 93% and 98% RH) were evaluated over a three week postharvest storage period to assess blueberry texture parameters using a texture analyser, where microstructural changes were assessed by light microscopy and optical coherence tomography (OCT).
Under high weight loss conditions there was an increase in berry softening and a decrease in texture characteristics whereas an increase in berry firmness, hardness and gumminess was observed during storage under low weight loss conditions.
Light microscopy clearly illustrated microstructural differences among ‘Centurion’ blueberries stored in different weight loss conditions, in retention of cell shape, degree of cell to cell wall contact, the amount of space between cells and cell wall integrity. When berries lost moisture during storage, epidermal and subepidermal cells retained their integrity, and parenchyma cells lost integrity leading to collapse which may contribute to overall fruit quality during postharvest.
3D OCT images showed no obvious differentiation between large cells at each weight loss treatment, however significant differences were observed in the microstructure between each storage period. In general the microstructure of medium to large cells in the parenchyma tissue showed an increase in average surface area and total surface area after each storage period.
In summary, low weight loss storage conditions help to preserve blueberry texture and quality, whilst maintaining cellular structure and integrity during postharvest storage. It is recommended blueberries are stored between 95 – 99% RH and at a low temperatures to prevent moisture loss during postharvest.
Subjects/Keywords: Blueberries;
Storage;
Postharvest physiology;
Postharvest technology
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Franklin, D. K. (2019). Characterising texture and cellular level responses of 'Centurion' blueberries during storage in different weight loss conditions. (Masters Thesis). Massey University. Retrieved from http://hdl.handle.net/10179/15461
Chicago Manual of Style (16th Edition):
Franklin, Deena Kelsey. “Characterising texture and cellular level responses of 'Centurion' blueberries during storage in different weight loss conditions.” 2019. Masters Thesis, Massey University. Accessed January 16, 2021.
http://hdl.handle.net/10179/15461.
MLA Handbook (7th Edition):
Franklin, Deena Kelsey. “Characterising texture and cellular level responses of 'Centurion' blueberries during storage in different weight loss conditions.” 2019. Web. 16 Jan 2021.
Vancouver:
Franklin DK. Characterising texture and cellular level responses of 'Centurion' blueberries during storage in different weight loss conditions. [Internet] [Masters thesis]. Massey University; 2019. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10179/15461.
Council of Science Editors:
Franklin DK. Characterising texture and cellular level responses of 'Centurion' blueberries during storage in different weight loss conditions. [Masters Thesis]. Massey University; 2019. Available from: http://hdl.handle.net/10179/15461
Massey University
3.
Hashmi, Majid Suhail.
Hypobaric treatment : an innovative approach to control postharvest diseases of strawberries.
Degree: PhD, Food Technology, 2014, Massey University
URL: http://hdl.handle.net/10179/5638
► Fungal decay is one of the major causes of postharvest losses in strawberries. Conventionally fungicides have been used to control fungal decay. However, fungicides have…
(more)
▼ Fungal decay is one of the major causes of postharvest losses in strawberries. Conventionally fungicides have been used to control fungal decay. However, fungicides have been questioned as a sustainable and safe method. Pre-storage application of short-term hypobaric treatment is one of the potential non-chemical methods for reducing fungal decay. In this study efficacy of postharvest hypobaric treatments to control natural rot development in strawberries was evaluated and analysed for the possible induction of resistance. Treatment of strawberries with hypobaric pressure (50 kPaa for 4 h at 20 °C) consistently reduced rot development in subsequent storage at 20 or 5 °C. An in vitro study found that the rate of radial growth of colonies of Botrytis cinerea and Rhizopus stolonifer was unaffected by hypobaric treatment. Moreover, post-hypobaric treated strawberries inoculated immediately or 12 h after treatment with corresponding fungi led to significant (P< 0.05) rot reduction during storage at 20 °C. Bio-chemical analysis of strawberries suggested that hypobaric treatment upregulated the activities of defence-related enzymes with phenylalanine ammonia-lyase (PAL) and chitinase peaking 12 h after treatment, while peroxidase (POD) increased immediately after treatment. These results provide evidence that the mechanism of action of hypobaric treatment is induction of the defence system within the fruit rather than a direct effect on fungal viability. Furthermore, the 4 h delay in cooling required for hypobaric treatment did not cause greater rots compared to immediate cooling at-harvest. Therefore treatment is recommended to be applied at low temperature immediately after harvest. Despite these scientific results, a combination of hypobaric treatment and cold storage may not be sufficient for extending commercial storage life of strawberries. For more effective application, probably hypobaric treatment should be regarded as a hurdle technology to be used in conjunction with other physical treatments such as (UV-C, heat and ultrasound) and/or volatile chemical treatments.
Subjects/Keywords: Strawberries;
Postharvest technology
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hashmi, M. S. (2014). Hypobaric treatment : an innovative approach to control postharvest diseases of strawberries. (Doctoral Dissertation). Massey University. Retrieved from http://hdl.handle.net/10179/5638
Chicago Manual of Style (16th Edition):
Hashmi, Majid Suhail. “Hypobaric treatment : an innovative approach to control postharvest diseases of strawberries.” 2014. Doctoral Dissertation, Massey University. Accessed January 16, 2021.
http://hdl.handle.net/10179/5638.
MLA Handbook (7th Edition):
Hashmi, Majid Suhail. “Hypobaric treatment : an innovative approach to control postharvest diseases of strawberries.” 2014. Web. 16 Jan 2021.
Vancouver:
Hashmi MS. Hypobaric treatment : an innovative approach to control postharvest diseases of strawberries. [Internet] [Doctoral dissertation]. Massey University; 2014. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10179/5638.
Council of Science Editors:
Hashmi MS. Hypobaric treatment : an innovative approach to control postharvest diseases of strawberries. [Doctoral Dissertation]. Massey University; 2014. Available from: http://hdl.handle.net/10179/5638
Georgia Tech
4.
Adebola, Olufunke T.
Market-based approaches for postharvest loss reduction.
Degree: PhD, International Affairs, 2020, Georgia Tech
URL: http://hdl.handle.net/1853/62762
► Do farmers in contract farming (CF) arrangements have lower levels of postharvest losses than do farmers who do not participate in contract farming? Does our…
(more)
▼ Do farmers in contract farming (CF) arrangements have lower levels of
postharvest losses than do farmers who do not participate in contract farming? Does our current understanding of
postharvest losses overlook other critical causes of loss? According to the Food and Agriculture Organization (FAO), about 1.3 billion tons of food, representing nearly one-third of annual global food production, is lost or wasted before it reaches the final consumer. In Africa, 18 percent of cereals is lost
postharvest. Technologies have traditionally been deployed towards reducing these losses. However, the success of technology solutions has been inconclusive in Africa. In light of this, market-led approaches to reducing losses are becoming mainstream in the
postharvest loss literature. The research finds that farmers who participated in formal contract farming schemes experienced lower
postharvest loss than farmers who did not. However, farmers participating in informal contracting schemes suffered more significant
postharvest loss than did farmers in formal schemes or no schemes at all. The research also finds that while contract farming is an effective market-based policy for increasing food production and reducing losses, several institutional and cultural factors can hinder the communities from maximizing the potential benefits of contract farming. It also finds that the current understanding of
postharvest loss is limited because the issue has been approached at the macro-level. To improve our knowledge and governance of
postharvest losses, researchers must move from the macro-theoretical level to consider the micro-practical level and examine other unanswered, ignored, and unaccounted-for social and policy issues that drive
postharvest losses.
Advisors/Committee Members: Boston, Thomas (advisor), Colton, Jonathan (committee member), Winders, William (committee member), Best, Michael (committee member), Kumar, Neha (committee member).
Subjects/Keywords: Postharvest loss; Contract farming; Ghana
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Adebola, O. T. (2020). Market-based approaches for postharvest loss reduction. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/62762
Chicago Manual of Style (16th Edition):
Adebola, Olufunke T. “Market-based approaches for postharvest loss reduction.” 2020. Doctoral Dissertation, Georgia Tech. Accessed January 16, 2021.
http://hdl.handle.net/1853/62762.
MLA Handbook (7th Edition):
Adebola, Olufunke T. “Market-based approaches for postharvest loss reduction.” 2020. Web. 16 Jan 2021.
Vancouver:
Adebola OT. Market-based approaches for postharvest loss reduction. [Internet] [Doctoral dissertation]. Georgia Tech; 2020. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/1853/62762.
Council of Science Editors:
Adebola OT. Market-based approaches for postharvest loss reduction. [Doctoral Dissertation]. Georgia Tech; 2020. Available from: http://hdl.handle.net/1853/62762
University of Tasmania
5.
Edgley, M.
Causes and mechanisms of red drupelet reversion in blackberries.
Degree: 2019, University of Tasmania
URL: https://eprints.utas.edu.au/32134/7/Edgley_whole_thesis_ex_pub_mat.pdf
;
https://eprints.utas.edu.au/32134/1/Edgley_whole_thesis.pdf
;
Edgley,
M
ORCID:
0000-0002-0847-5487
<https://orcid.org/0000-0002-0847-5487>
2019
,
'Causes
and
mechanisms
of
red
drupelet
reversion
in
blackberries',
PhD
thesis,
University
of
Tasmania.
► Red drupelet reversion (RDR) is a physiological disorder of blackberries, whereby individual or groups of drupelets that are black at harvest revert to red, usually…
(more)
▼ Red drupelet reversion (RDR) is a physiological disorder of blackberries, whereby individual or groups of drupelets that are black at harvest revert to red, usually after the fruit has been harvested and placed into cool storage. RDR reduces the visual and physical quality of the fruit and is considered a major physiological disorder of commercial blackberries. This thesis examined the physiochemical changes that occur during RDR development and investigated pre and postharvest factors associated with the development of the disorder.
The physiochemical properties of drupelets that were affected and unaffected by RDR were examined. The total anthocyanin concentration in black, partially red, and fully red drupelets was 1841 mg kg(-1), 1064 mg kg(-1) and 769 mg kg(-1) by fresh weight respectively. Anthocyanins containing acylated or disaccharide sugar moieties were more stable than anthocyanins with non-acylated and monosaccharide sugar moieties. The pH of partially red (3.05) and fully red drupelets (3.01) was lower than that of black drupelets (3.32). The firmness, measured by penetrometer, of partially red (1.90 N) and fully red drupelets (1.77 N) was lower than fully black drupelets (2.39 N). Electrolyte leakage over 24 h was higher from partially red (84.8 %) and fully red drupelets (90.0 %) than fully black drupelets (64.9 %). Examination by light and electron microscopy showed consistent cell disruption, separation and loss of integrity in the upper mesocarp of affected drupelets. The physiochemical symptoms associated with the development of RDR were consistent with mechanical injury, causing cell decompartmentalisation and subsequent anthocyanin degradation.
The effects of handling fruit and climatic factors at harvest on RDR incidence and severity were investigated during 10 harvests in 2017. Fruit that were handled during harvest had at least one drupelet develop RDR in 85 % of samples, while only 6 % of fruit that were not handled had any drupelets that developed the disorder.
The incidence and severity of RDR was significantly higher when fruit skin temperatures exceeded 23 °C during harvest, and these conditions were also associated with reduced skin firmness of drupelets that were affected and unaffected by RDR.
The degree of colour change following controlled, repeatable impact damage at a range of temperatures and subsequent storage conditions was measured by colourimeter. Impact injury caused a significant colour difference (ΔE) relative to the control fruit in 95 % of fruit. As temperature during impact and the subsequent rate of temperature change increased, the severity of colour change worsened.
The effects of nitrogen (N) application rate on RDR, fruit quality, and yield were investigated in a two-year trial. A high N application rate of 212 kg ha(-1) produced fruit with significantly higher incidence and severity of RDR than medium (106 kg ha(-1)) and low N (53 kg ha(-1)) rates. The high N treatment increased yield through increasing the number of harvestable…
Subjects/Keywords: Postharvest; physiology; fruit quality; reddening
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Edgley, M. (2019). Causes and mechanisms of red drupelet reversion in blackberries. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/32134/7/Edgley_whole_thesis_ex_pub_mat.pdf ; https://eprints.utas.edu.au/32134/1/Edgley_whole_thesis.pdf ; Edgley, M ORCID: 0000-0002-0847-5487 <https://orcid.org/0000-0002-0847-5487> 2019 , 'Causes and mechanisms of red drupelet reversion in blackberries', PhD thesis, University of Tasmania.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Edgley, M. “Causes and mechanisms of red drupelet reversion in blackberries.” 2019. Thesis, University of Tasmania. Accessed January 16, 2021.
https://eprints.utas.edu.au/32134/7/Edgley_whole_thesis_ex_pub_mat.pdf ; https://eprints.utas.edu.au/32134/1/Edgley_whole_thesis.pdf ; Edgley, M ORCID: 0000-0002-0847-5487 <https://orcid.org/0000-0002-0847-5487> 2019 , 'Causes and mechanisms of red drupelet reversion in blackberries', PhD thesis, University of Tasmania..
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Edgley, M. “Causes and mechanisms of red drupelet reversion in blackberries.” 2019. Web. 16 Jan 2021.
Vancouver:
Edgley M. Causes and mechanisms of red drupelet reversion in blackberries. [Internet] [Thesis]. University of Tasmania; 2019. [cited 2021 Jan 16].
Available from: https://eprints.utas.edu.au/32134/7/Edgley_whole_thesis_ex_pub_mat.pdf ; https://eprints.utas.edu.au/32134/1/Edgley_whole_thesis.pdf ; Edgley, M ORCID: 0000-0002-0847-5487 <https://orcid.org/0000-0002-0847-5487> 2019 , 'Causes and mechanisms of red drupelet reversion in blackberries', PhD thesis, University of Tasmania..
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Edgley M. Causes and mechanisms of red drupelet reversion in blackberries. [Thesis]. University of Tasmania; 2019. Available from: https://eprints.utas.edu.au/32134/7/Edgley_whole_thesis_ex_pub_mat.pdf ; https://eprints.utas.edu.au/32134/1/Edgley_whole_thesis.pdf ; Edgley, M ORCID: 0000-0002-0847-5487 <https://orcid.org/0000-0002-0847-5487> 2019 , 'Causes and mechanisms of red drupelet reversion in blackberries', PhD thesis, University of Tasmania.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Guelph
6.
Brandt, Robert.
Effect of Hexanal Formulations on the Postharvest Quality and Gene Expression of Strawberry (Fragaria x ananassa Duch.).
Degree: MS, Department of Plant Agriculture, 2019, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14761
► Food waste is a major concern with the growing world population. Research was conducted using hexanal based formulations to improve the shelf-life of strawberry. Pre-harvest…
(more)
▼ Food waste is a major concern with the growing world population. Research was conducted using hexanal based formulations to improve the shelf-life of strawberry. Pre-harvest sprays of the Enhanced Freshness Formulation (EFF) were applied to field grown strawberries. The applications had minimal effect on characteristics such as blemishes per fruit, firmness and weight change. Greenhouse grown strawberries were treated
postharvest with hexanal vapour and did show minimal improvements to shelf-life although a cultivar effect was observed. qRT-PCR was performed on five cultivars that received a pre-harvest treatment of EFF. Different genes were assessed including cell wall and membrane modifying enzymes, ripening related transcription factors, and ethylene related proteins. EFF application altered expression of both membrane and ethylene related genes. When control treated fruit were analyzed for expression changes throughout development, results indicated cultivar differences as previously reported. In summary hexanal application had minimal effects on strawberry
postharvest quality.
Advisors/Committee Members: Sullivan, J. Alan (advisor).
Subjects/Keywords: Phospholipase D; Hexanal; Postharvest; Strawberry
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Brandt, R. (2019). Effect of Hexanal Formulations on the Postharvest Quality and Gene Expression of Strawberry (Fragaria x ananassa Duch.). (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14761
Chicago Manual of Style (16th Edition):
Brandt, Robert. “Effect of Hexanal Formulations on the Postharvest Quality and Gene Expression of Strawberry (Fragaria x ananassa Duch.).” 2019. Masters Thesis, University of Guelph. Accessed January 16, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14761.
MLA Handbook (7th Edition):
Brandt, Robert. “Effect of Hexanal Formulations on the Postharvest Quality and Gene Expression of Strawberry (Fragaria x ananassa Duch.).” 2019. Web. 16 Jan 2021.
Vancouver:
Brandt R. Effect of Hexanal Formulations on the Postharvest Quality and Gene Expression of Strawberry (Fragaria x ananassa Duch.). [Internet] [Masters thesis]. University of Guelph; 2019. [cited 2021 Jan 16].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14761.
Council of Science Editors:
Brandt R. Effect of Hexanal Formulations on the Postharvest Quality and Gene Expression of Strawberry (Fragaria x ananassa Duch.). [Masters Thesis]. University of Guelph; 2019. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14761
Massey University
7.
Samarakoon, Himani Chamila.
Ethylene flux in postharvest kiwifruit systems.
Degree: M. Phil., Food Technology, 2013, Massey University
URL: http://hdl.handle.net/10179/5189
► Damaged or rotten kiwifruit or change of environmental conditions (temperature) through the supply chain may trigger premature ripening and softening of sound fruit as a…
(more)
▼ Damaged or rotten kiwifruit or change of environmental conditions (temperature) through the supply chain may trigger premature ripening and softening of sound fruit as a result of the expected higher rates of ethylene production caused by these events. This thesis quantified some of the key factors which will govern ethylene composition within a commercial kiwifruit package (targeting ‘Hayward’ variety) as a preliminary step for constructing a predictive model that enable interpreting of ethylene from the sensor which could be used in detecting quality of kiwifruit within a package.
Ethylene production was found to be strongly associated with kiwifruit firmness and temperature of ‘Hayward’ kiwifruit. Maximal ethylene production (16,000 to 120,000 times that of minimal production) was observed when kiwifruit firmness reached less than 13 N suggesting that detection of ethylene concentration within a kiwifruit box should be able to be used to provide a reasonable estimate of the firmness of the fruit within the package. Lower rates of ethylene production were measured at 0 and 2 °C in comparison to previously reported data due to the advantage of using a newly developed high sensitivity ethylene detector, ETD-300 in present study. Ethylene production data obtained at a broad range of potential supply chain temperatures (0, 2, 5, 10 and 20 °C) concluded that at higher temperature (10 and 20 °C) initiation of an observable increase in ethylene production occurs at an earlier stage of firmness (10.5-13 N) while firmness of kiwifruit should reduce more (5.6-5.7 N) to observe this at lower temperature (0 and 2 °C). A simple mathematical model was developed which can be used to predict the ethylene production of ‘Hayward’ kiwifruit given a known fruit quality (firmness) and temperature condition.
Impact injured ‘Hayward’ kiwifruit produced high ethylene as a typical ‘stress/wound’ physiological response and results strongly indicated that temperature plays a significant role in controlling synthesis of wound ethylene by showing no effect at 0 °C and 2-3 times increase of ethylene production at 20 °C than at 5 °C. Two fold increase of rate of ethylene production was observed with different degree of impact damage (30, 60 and 120 cm drop heights) adding evidence to the effect of severity/degree of injury on increase of wound induced ethylene. Moreover, results
of two different maturity levels of kiwifruit demonstrated the further effect of firmness reduction of kiwifruit on increase of impact injury ethylene production.
A one to twenty times increase in ethylene evolution rate for ‘Hayward’ kiwifruit following subsequent transfer to a higher temperature from a lower temperature (0?2 °C, 2?5 °C, 5?10 °C, 10?20 °C) was demonstrated. Mathematical estimation of the desorbed ethylene at each transient increase of temperature using Henry’s law revealed that there are other factors (via ethylene synthesis pathway) contribute to the escalation of ethylene evolution observed during and immediately subsequent to an increase in…
Subjects/Keywords: Kiwifruit;
Postharvest technology;
Ethylene flux
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Samarakoon, H. C. (2013). Ethylene flux in postharvest kiwifruit systems. (Masters Thesis). Massey University. Retrieved from http://hdl.handle.net/10179/5189
Chicago Manual of Style (16th Edition):
Samarakoon, Himani Chamila. “Ethylene flux in postharvest kiwifruit systems.” 2013. Masters Thesis, Massey University. Accessed January 16, 2021.
http://hdl.handle.net/10179/5189.
MLA Handbook (7th Edition):
Samarakoon, Himani Chamila. “Ethylene flux in postharvest kiwifruit systems.” 2013. Web. 16 Jan 2021.
Vancouver:
Samarakoon HC. Ethylene flux in postharvest kiwifruit systems. [Internet] [Masters thesis]. Massey University; 2013. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10179/5189.
Council of Science Editors:
Samarakoon HC. Ethylene flux in postharvest kiwifruit systems. [Masters Thesis]. Massey University; 2013. Available from: http://hdl.handle.net/10179/5189
Rice University
8.
Liu, John.
The Plant Circadian Clock: Roles in Jasmonate Accumulation and Postharvest Plant Performance.
Degree: PhD, Natural Sciences, 2015, Rice University
URL: http://hdl.handle.net/1911/88094
► Nearly all organisms have evolved circadian clocks that allow them to anticipate and prepare for cyclical changes in their environment, such as those associated with…
(more)
▼ Nearly all organisms have evolved circadian clocks that allow them to anticipate and prepare for cyclical changes in their environment, such as those associated with the transitions from night to day and between seasons. The plant circadian clock functions nearly cell autonomously, regulating rhythmic behaviors in a variety of processes that range from the transcriptional level up to organismal level. Although great progress has been made in determining how the clock functions in plants, not much is known about the clock’s physiological relevance on particular plant processes. Specifically, the clock influences plant defense against Trichoplusia ni (T. ni), as well as basal rhythmic accumulation of jasmonic acid (JA), a plant hormone involved in the regulation of resistance against insect herbivores such as T. ni and necrotrophic fungi such as Botrytis cinerea (B. cinerea). Additionally, the clock affects the accumulation of glucosinolates, secondary metabolites involved in plant insect resistance, in both Arabidopsis and
postharvest cabbage (Brassica oleracea). Here we show that rhythmic accumulation of basal JA may be transcriptionally regulated through clock controlled JA-biosynthesis gene transcript accumulation. Additionally, the clock may influence rhythmic accumulation of gene transcripts involved in JA biosynthesis independently of JA-positive feedback. Furthermore, while SA and JA act antagonistically, we note that decreased SA does not influence differential accumulation of JA-biosynthesis related gene transcripts. We also show that phase-entrainment dependent plant resistance to T. ni is influenced in part by aliphatic glucosinolates. Finally, we demonstrate that
postharvest vegetables kept in light/dark cycles maintain appearance, tissue integrity, chlorophyll levels, and glucosinolate levels for longer periods of time when compared to
postharvest vegetables stored in constant light or constant dark. Moreover,
postharvest plants exhibit improved resistance to B. cinerea when kept under light/dark cycles when compared to constant light storage.
Advisors/Committee Members: Bartel, Bonnie (advisor), Gustin, Michael (committee member), Matsuda, Seiichi (committee member), Zhong, Weiwei (committee member), Braam, Janet (committee member).
Subjects/Keywords: Arabidopsis; circadian clock; jasmonic acid; jasmonates; postharvest; postharvest performance
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Liu, J. (2015). The Plant Circadian Clock: Roles in Jasmonate Accumulation and Postharvest Plant Performance. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/88094
Chicago Manual of Style (16th Edition):
Liu, John. “The Plant Circadian Clock: Roles in Jasmonate Accumulation and Postharvest Plant Performance.” 2015. Doctoral Dissertation, Rice University. Accessed January 16, 2021.
http://hdl.handle.net/1911/88094.
MLA Handbook (7th Edition):
Liu, John. “The Plant Circadian Clock: Roles in Jasmonate Accumulation and Postharvest Plant Performance.” 2015. Web. 16 Jan 2021.
Vancouver:
Liu J. The Plant Circadian Clock: Roles in Jasmonate Accumulation and Postharvest Plant Performance. [Internet] [Doctoral dissertation]. Rice University; 2015. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/1911/88094.
Council of Science Editors:
Liu J. The Plant Circadian Clock: Roles in Jasmonate Accumulation and Postharvest Plant Performance. [Doctoral Dissertation]. Rice University; 2015. Available from: http://hdl.handle.net/1911/88094
University of Pretoria
9.
[No author].
Mode of action of Bacillus subtilis ATCC 55466 as
biocontrol agent of postharvest diseases of avocados
.
Degree: 2011, University of Pretoria
URL: http://upetd.up.ac.za/thesis/available/etd-02132006-082309/
► Avocados are an economically important crop in South Africa and are mainly exported to Europe. As with any other tropical and subtropical crop, avocados are…
(more)
▼ Avocados are an economically important crop in South
Africa and are mainly exported to Europe. As with any other
tropical and subtropical crop, avocados are prone to pre- and
postharvest diseases. Until recently, chemical control was the only
effective measure to control fungal avocado pathogens In 1987, a
Bacillus subtilis isolate was found that showed promise as a
biocontrol agent in both pre- and
postharvest applications to
control
postharvest diseases. However, over time variable results
has been obtained in semi commercial trials. From the original B.
subtilis isolate several subcultures have been made and used over a
15 year period in various experimental trials. The dual culture
technique was used to compare the biocontrol activity of the
subcultures against
postharvest pathogens (Colletotrichum
gloeosporioides, Phomopsis perseae, Dothiorella aromatica and
Lasiodiplodia theobromae). The subcultures differed significantly
in their effectiveness and genetic stability. No difference between
the subcultures could be found when DNA fingerprinting using RISA
PCR was used. The most effective subculture, MI-14, was used in
further studies. The mode of action employed by a biocontrol agent
is of utmost importance and can be used to enhance its efficacy. In
a previous study it was hypothesized that antibiosis as well as
competition for nutrients and space is the modes of action involved
in biocontrol of B. subtilis against
postharvest pathogens of
avocado. The direct interaction between B. subtilis and C.
gloeosporioides on avocado fruit were observed using scanning
electron microscopy. Cells of B. subtilis were observed to colonize
the hyphae of C gloeosporioides. In some instances, hyphal walls
were lysed in the presence of B. subtilis and may be due to the
presence of enzymes or antibiotic substances. Conidia of C.
gloeosporioides did not germinate in the presence of B. subtilis.
Diffusible inhibitory metabolites active against C. gloeosporioides
were produced in vitro by B. subtilis. Inhibitory volatile
substances were also produced by B. subtilis and were found to be
active against P. perseae, D. aromatica and L. theobromae but not
C. gloeosporioides. Siderophores production as well as chitinase,
amylase, lipase and proteinase activity were also observed and may
play a role in antagonism. Antibiotic production by B. subtilis is
a well-known phenomenon. Most antibiotics are polypeptides and
lipopeptides. The involvement of phenolic metabilites in biocontrol
by B subtilis is less known. A seven-day-old culture of B. subtilis
in a minimal medium was analyzed for the presence of free acid
phenolic compounds active against fungi. Free acid phenolic
metabolites were found and separated using layer chromatography.
TLC plates containing the separated spots were sprayed with
Clasdosporium cladosporioides and plates were observed for
inhibition zones. The phenolic substances were present at 7.06 ±
0.95 mg gallic acid ml-1. The phenolic substances fall in the
hydroxycinamic acid group due to their fluorescent coloring under…
Advisors/Committee Members: Prof L Korsten (advisor).
Subjects/Keywords: Bacillus subtilis;
Avocados;
Postharvest diseases;
UCTD
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
author], [. (2011). Mode of action of Bacillus subtilis ATCC 55466 as
biocontrol agent of postharvest diseases of avocados
. (Masters Thesis). University of Pretoria. Retrieved from http://upetd.up.ac.za/thesis/available/etd-02132006-082309/
Chicago Manual of Style (16th Edition):
author], [No. “Mode of action of Bacillus subtilis ATCC 55466 as
biocontrol agent of postharvest diseases of avocados
.” 2011. Masters Thesis, University of Pretoria. Accessed January 16, 2021.
http://upetd.up.ac.za/thesis/available/etd-02132006-082309/.
MLA Handbook (7th Edition):
author], [No. “Mode of action of Bacillus subtilis ATCC 55466 as
biocontrol agent of postharvest diseases of avocados
.” 2011. Web. 16 Jan 2021.
Vancouver:
author] [. Mode of action of Bacillus subtilis ATCC 55466 as
biocontrol agent of postharvest diseases of avocados
. [Internet] [Masters thesis]. University of Pretoria; 2011. [cited 2021 Jan 16].
Available from: http://upetd.up.ac.za/thesis/available/etd-02132006-082309/.
Council of Science Editors:
author] [. Mode of action of Bacillus subtilis ATCC 55466 as
biocontrol agent of postharvest diseases of avocados
. [Masters Thesis]. University of Pretoria; 2011. Available from: http://upetd.up.ac.za/thesis/available/etd-02132006-082309/
University of Otago
10.
Siva Manikam, Raseetha Vani.
Feasibility of using combined Proton Transfer Reaction Mass Spectrometry (PTR-MS) technique and biochemical analyses to assess the quality of broccoli florets during postharvest storage, handling and temperature treatments
.
Degree: 2013, University of Otago
URL: http://hdl.handle.net/10523/4127
► The objective of this research was to gain a better understanding of the relationship between changes in volatiles release, colour and biochemical markers (i.e. pigment…
(more)
▼ The objective of this research was to gain a better understanding of the relationship between changes in volatiles release, colour and biochemical markers (i.e. pigment content, antioxidant levels, activity of enzymes and oxidative damage levels) during
postharvest storage and mechanical damage. This study attempted to find potential volatile markers, using Proton Transfer Reaction Mass Spectrometry (PTR-MS), that were statistically correlated with biochemical and physiological changes associated with
postharvest storage and mechanical damage. Multivariate statistical analysis and regression analysis using Partial Least Squares Regression (PLSR) was used to evaluate possible correlations. It is hypothesized that volatile markers in combination with biochemical analyses can be used to assess quality changes during
postharvest storage and handling of broccoli.
The intensity of protonated volatile organic compounds with the mass ions m/z 33 and m/z 49 were tentatively identified as methanol and methanethiol. While both increased, methanol was the dominant volatile detected. The increase of these mass ions was observed at the onset of senescence (Day 3, 23 °C), at which point chlorophyll breakdown was initiated, resulting in colour change from green to yellow. Validations were carried out using cytokinin 6-benzylaminopurine (BAP) which delays the onset of senescence for several days. Application of BAP delayed senescence in a concentration dependent manner, with 50 ppm or above BAP slowed the rate of senescence, as determined by chlorophyll loss measurement. Application of BAP also slowed the rate of methanol release. Colour change as a marker for the onset of senescence was validated using markers of oxidative damage and defence, which are known to be key indicators of the onset and progression of senescence. Depending on the BAP concentrations, measurements of antioxidant enzymes, non-enzymatic antioxidants and markers of oxidative damage confirmed that senescence was delayed. To further determine if the release of methanol was due to major cellular disruption, which occurs during senescence, broccoli florets at different stages of senescence were subjected to severe mechanical damage and the damaged tissues were monitored for up to six hours.
In addition, broccoli florets were subjected to different temperature treatments ranging from -18 to 100 °C to simulate different types of cellular and metabolic disruption. The stage of senescence prior to mechanical damage was the critical factor determining the cellular and metabolic integrity of broccoli samples six hours following the damage event although mechanical damage accelerated the breakdown of photosynthetic pigments, the inactivation of antioxidant enzymes, the degradation of non-enzymatic antioxidants and increases in the levels of oxidative damage and methanol.
The temperature treatments (-18, 50, 70 and 100 °C) disrupted cellular metabolism as evidenced by changes in the activities of several enzymes (POD, SOD, CAT and AAO) and led to significant increases in…
Advisors/Committee Members: Oey, Indrawati (advisor).
Subjects/Keywords: broccoli;
PTR-MS;
quality;
postharvest;
PLSR
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Siva Manikam, R. V. (2013). Feasibility of using combined Proton Transfer Reaction Mass Spectrometry (PTR-MS) technique and biochemical analyses to assess the quality of broccoli florets during postharvest storage, handling and temperature treatments
. (Doctoral Dissertation). University of Otago. Retrieved from http://hdl.handle.net/10523/4127
Chicago Manual of Style (16th Edition):
Siva Manikam, Raseetha Vani. “Feasibility of using combined Proton Transfer Reaction Mass Spectrometry (PTR-MS) technique and biochemical analyses to assess the quality of broccoli florets during postharvest storage, handling and temperature treatments
.” 2013. Doctoral Dissertation, University of Otago. Accessed January 16, 2021.
http://hdl.handle.net/10523/4127.
MLA Handbook (7th Edition):
Siva Manikam, Raseetha Vani. “Feasibility of using combined Proton Transfer Reaction Mass Spectrometry (PTR-MS) technique and biochemical analyses to assess the quality of broccoli florets during postharvest storage, handling and temperature treatments
.” 2013. Web. 16 Jan 2021.
Vancouver:
Siva Manikam RV. Feasibility of using combined Proton Transfer Reaction Mass Spectrometry (PTR-MS) technique and biochemical analyses to assess the quality of broccoli florets during postharvest storage, handling and temperature treatments
. [Internet] [Doctoral dissertation]. University of Otago; 2013. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10523/4127.
Council of Science Editors:
Siva Manikam RV. Feasibility of using combined Proton Transfer Reaction Mass Spectrometry (PTR-MS) technique and biochemical analyses to assess the quality of broccoli florets during postharvest storage, handling and temperature treatments
. [Doctoral Dissertation]. University of Otago; 2013. Available from: http://hdl.handle.net/10523/4127
Oregon State University
11.
Vollmer, Gregory S.
The effect of residue removal and burning on the growth of Festuca longifolia Thuill. and Festuca rubra L. subsp. commutata Gaud. established for seed production.
Degree: MS, Crop Science, 1986, Oregon State University
URL: http://hdl.handle.net/1957/40440
► Hard Fescue (Festuca longifolia Thuill.) has potential for in creased turf use but does not respond well to normal seed production management practices in Oregon.…
(more)
▼ Hard Fescue (Festuca longifolia Thuill.) has potential for in
creased turf use but does not respond well to normal seed production
management practices in Oregon. Field burning (the normal residue
management practice) results in reduced seed yields in commercial hard
fescue seed production fields but stimulates seed production in Chewings
fescue (Festuca rubra L. subsp. commutata Gaud.) and other species. The purpose of this study was to describe differences in
tillering patterns in hard fescue and Chewings fescue in response to
various post harvest residue management treatments.
Burn and crewcut (clip and vacuum) post harvest residue management treatments were applied on two different dates. Information on
number and type of tiller units and tillers produced, dry weights,
leaf number and length, tiller fertility and components of yield was
collected through one seed production season.
Differences in hard and Chewings fescue were indicated by cultivar
x management interactions in many of the components measured.
Chewings fescue has the ability to recover from all but the most severe (late burn) management by November while tiller numbers were
reduced in all but the least severe (early crewcut) management in hard
fescue on that date.
Differences were also observed in the type of tiller produced.
Hard fescue produced a higher percentage of aerial tillers than did
the Chewings fescue. These aerial tillers did not survive beyond
February and made no apparent contribution to yield. No differences
were observed in the number of early season basal tillers. A high
vegetative tiller population was maintained in hard fescue until
harvest while in Chewings fescue dry matter production was concentrated in fertile tillers.
The superior seed yield of the Chewings fescue cultivar was due
to a 30% greater number of fertile tillers per unit area and a 25%
greater mean seed weight. Differences in seed yield between species
cannot be simply attributed to the availability of early season basal
tillers for floral induction but are due to the effects of intertiller
competition, dry matter partitioning and the genetic propensity
to favor seed production over the maintenance of vegetative tillers.
In this study, normal (early) burning did not reduce the seed
yield of the hard fescue cultivars. This was attributed to the pretreatment
flail chop and partial removal of harvest litter. This
suggests that a modified burn management system may increase or main
tain hard fescue seed yield.
Advisors/Committee Members: Youngberg, Harold (advisor), Chilcote, David (committee member).
Subjects/Keywords: Fescue – Postharvest technology
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Vollmer, G. S. (1986). The effect of residue removal and burning on the growth of Festuca longifolia Thuill. and Festuca rubra L. subsp. commutata Gaud. established for seed production. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/40440
Chicago Manual of Style (16th Edition):
Vollmer, Gregory S. “The effect of residue removal and burning on the growth of Festuca longifolia Thuill. and Festuca rubra L. subsp. commutata Gaud. established for seed production.” 1986. Masters Thesis, Oregon State University. Accessed January 16, 2021.
http://hdl.handle.net/1957/40440.
MLA Handbook (7th Edition):
Vollmer, Gregory S. “The effect of residue removal and burning on the growth of Festuca longifolia Thuill. and Festuca rubra L. subsp. commutata Gaud. established for seed production.” 1986. Web. 16 Jan 2021.
Vancouver:
Vollmer GS. The effect of residue removal and burning on the growth of Festuca longifolia Thuill. and Festuca rubra L. subsp. commutata Gaud. established for seed production. [Internet] [Masters thesis]. Oregon State University; 1986. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/1957/40440.
Council of Science Editors:
Vollmer GS. The effect of residue removal and burning on the growth of Festuca longifolia Thuill. and Festuca rubra L. subsp. commutata Gaud. established for seed production. [Masters Thesis]. Oregon State University; 1986. Available from: http://hdl.handle.net/1957/40440
Cornell University
12.
Doerflinger, Franziska.
Starch Metabolism In Apple Fruit And Its Relationship With Maturation And Ripening.
Degree: PhD, Horticultural Biology, 2015, Cornell University
URL: http://hdl.handle.net/1813/40631
► Harvest timing of apples, an important factor determining fruit quality after storage, is often based on maturity assessments that include the starch pattern iodine (SPI)…
(more)
▼ Harvest timing of apples, an important factor determining fruit quality after storage, is often based on maturity assessments that include the starch pattern iodine (SPI) test. The SPI test provides a visual indicator of starch degradation in the equatorial region of the fruit. SPI and starch concentrations in apple cultivars, and the effects of factors such as aminoethoxyvinylglycine (AVG) and 1-methylcyclopropene (1-MCP), have been investigated. SPI values increased as starch concentrations declined in 'Gala, 'Honeycrisp', 'McIntosh', and 'Empire' apples during maturation. The two factors have a curvilinear relationship for all cultivars. Declines in percentage of amylose were found to be linear and cultivar dependent. Computer-based image analysis of SPI-based staining revealed a wide range of values, and a linear correlation was found between SPI value and percentage stained area. Starch concentrations in stem-end tissues were lower than in equatorial and calyx-end tissues of 'Empire' and 'Gala' apples. AVG and 1-MCP applied preharvest to inhibit ethylene production and perception, respectively, had cultivar as well as application timing-dependent effects on maturation. Effects of these treatments on starch degradation were limited in both 'McIntosh' and 'Empire' fruit. Weak correlations were found for 'Empire' apples between harvest indices and differences in absorbance (IAD) readings, which reflect chlorophyll concentrations in the skin. However, preharvest treatment of fruit with AVG and 1-MCP altered the relationships between IAD and other harvest indices, especially the internal ethylene concentration (IEC). 'Empire' apples are susceptible to firm flesh browning when stored at temperatures close to 0 °C, or after treatment with
postharvest 1-MCP. This storage disorder causes major losses for the apple industry every year and no storage regime has been found so far to alleviate the problem. A full economic analysis indicated that there is an economic tradeoff between harvest date, occurrence of flesh browning, and likely net profits. Overall maturity assessment at harvest could be used as an indicator for storage disorders and/or storage length if factors such as differences in fruit maturation between cultivars and within the fruit are better understood.
Advisors/Committee Members: Watkins,Christopher Brian (chair), Cheng,Lailiang (committee member), Rickard,Bradley J. (committee member).
Subjects/Keywords: apple (Malus domestica); starch; postharvest physiology
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Doerflinger, F. (2015). Starch Metabolism In Apple Fruit And Its Relationship With Maturation And Ripening. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/40631
Chicago Manual of Style (16th Edition):
Doerflinger, Franziska. “Starch Metabolism In Apple Fruit And Its Relationship With Maturation And Ripening.” 2015. Doctoral Dissertation, Cornell University. Accessed January 16, 2021.
http://hdl.handle.net/1813/40631.
MLA Handbook (7th Edition):
Doerflinger, Franziska. “Starch Metabolism In Apple Fruit And Its Relationship With Maturation And Ripening.” 2015. Web. 16 Jan 2021.
Vancouver:
Doerflinger F. Starch Metabolism In Apple Fruit And Its Relationship With Maturation And Ripening. [Internet] [Doctoral dissertation]. Cornell University; 2015. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/1813/40631.
Council of Science Editors:
Doerflinger F. Starch Metabolism In Apple Fruit And Its Relationship With Maturation And Ripening. [Doctoral Dissertation]. Cornell University; 2015. Available from: http://hdl.handle.net/1813/40631
Sardar Patel University
13.
Gol, Neeta. B.
Postharvest quality maintenance and shelf life extension
of some commercially important perishable horticultural
commodities;.
Degree: 2013, Sardar Patel University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/50731
newline
Reference given in the end of each
chapter
Advisors/Committee Members: Rao Ramana, T.V..Subjects/Keywords: horticultural commodities; Postharvest
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gol, N. B. (2013). Postharvest quality maintenance and shelf life extension
of some commercially important perishable horticultural
commodities;. (Thesis). Sardar Patel University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/50731
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gol, Neeta B. “Postharvest quality maintenance and shelf life extension
of some commercially important perishable horticultural
commodities;.” 2013. Thesis, Sardar Patel University. Accessed January 16, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/50731.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gol, Neeta B. “Postharvest quality maintenance and shelf life extension
of some commercially important perishable horticultural
commodities;.” 2013. Web. 16 Jan 2021.
Vancouver:
Gol NB. Postharvest quality maintenance and shelf life extension
of some commercially important perishable horticultural
commodities;. [Internet] [Thesis]. Sardar Patel University; 2013. [cited 2021 Jan 16].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/50731.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gol NB. Postharvest quality maintenance and shelf life extension
of some commercially important perishable horticultural
commodities;. [Thesis]. Sardar Patel University; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/50731
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Stellenbosch University
14.
Arendse, Ebrahiema.
Determining optimum storage conditions for pomegranate fruit (cv. Wonderful).
Degree: MScFoodSc, Food Science, 2014, Stellenbosch University
URL: http://hdl.handle.net/10019.1/86523
► ENGLISH ABSTRACT: The development of science-based management tools and appropriate postharvest handling protocols are required for the determination of optimal storage performance of pomegranate fruit.…
(more)
▼ ENGLISH ABSTRACT: The development of science-based management tools and appropriate
postharvest handling protocols are required for the determination of optimal storage performance of pomegranate fruit. The South African pomegranate industry experiences considerable fruit quality losses due to the lack of knowledge on optimal storage and handling practices. The cultivar ‘Wonderful’ is the widely grown in South Africa; however, to date there is currently limited scientific knowledge on the storage requirements. To develop quality standards for the export market, knowledge of optimum storage conditions are required to provide an understanding of
postharvest quality attributes and consumer organoleptic perceptions. The overall aim of this research was to provide science-based management tools for the storage performance of pomegranate fruit (cv. Wonderful).
The research reported in Chapter 3 focused on the physiological responses of pomegranate fruit at different storage temperatures. Commercially harvested fruit were stored at 5±0.7°C, 7.5±0.3°C and 10±0.5°C with 92±2% RH and at room temperature (21±3°C, 65±6% RH) for 5 months. Fruit respiration and physiological disorders during long term storage were investigated. During storage, low temperatures evidently resulted in lower respiration rates; however, respiration rate increased gradually after 2 months resulting in higher respiration rates at 5°C than 7.5°C after 3 month storage period. Overall, fruit became more susceptible to internal and external disorders as storage period progressed. Storage of fruit longer than 2 months at 5°C resulted in chilling injury and this was observed over the 5 month storage period. Fruit stored at 21°C and 10°C were discarded after 1 and 4 months, respectively, due to complete fruit loss to decay and peel shrinkage. Furthermore, the severity of browning increased with storage temperatures, although this became more severe at 5°C after 3 months. Therefore, to maintain a relatively low respiration rate and minimize physiological disorders, the cv. Wonderful should be stored at 5°C and >92% RH for storage period up to 3 months. In Chapter 4, the effects of temperature and storage duration on pomegranate fruit quality and mechanical properties were conducted. This study revealed that weight loss increased with rise in temperature and storage duration with the primary source of moisture loss being the fruit skin (peel), which resulted in significant reduction in peel thickness with prolonged storage period. The CIE (L*, a*, b* and C*) colour parameters of fruit and arils decreased during storage. However, the hue (hº) for whole fruit increased as a result of browning incidence, and decreased in arils suggesting an increase in redness. Significant increases in total soluble solids (TSS), pH, TSS:TA and BrimA were observed with significant decreases in titratable acidity (TA) occurring throughout the storage period. Storage temperature and duration significantly affected majority of the investigated mechanical properties. Puncture…
Advisors/Committee Members: Opara, U. L., Stellenbosch University. Faculty of AgriSciences. Dept. of Food Science..
Subjects/Keywords: Pomegranate – Storage; Pomegranate – Handling; Pomegranate – Postharvest technology
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Arendse, E. (2014). Determining optimum storage conditions for pomegranate fruit (cv. Wonderful). (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/86523
Chicago Manual of Style (16th Edition):
Arendse, Ebrahiema. “Determining optimum storage conditions for pomegranate fruit (cv. Wonderful).” 2014. Masters Thesis, Stellenbosch University. Accessed January 16, 2021.
http://hdl.handle.net/10019.1/86523.
MLA Handbook (7th Edition):
Arendse, Ebrahiema. “Determining optimum storage conditions for pomegranate fruit (cv. Wonderful).” 2014. Web. 16 Jan 2021.
Vancouver:
Arendse E. Determining optimum storage conditions for pomegranate fruit (cv. Wonderful). [Internet] [Masters thesis]. Stellenbosch University; 2014. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10019.1/86523.
Council of Science Editors:
Arendse E. Determining optimum storage conditions for pomegranate fruit (cv. Wonderful). [Masters Thesis]. Stellenbosch University; 2014. Available from: http://hdl.handle.net/10019.1/86523
University of Johannesburg
15.
Mhlophe, Sibongile Dorothy.
Use of 1-methylcyclopropene, modified atmosphere and imazalil to extend the storage life of 'Santa' tomatoes.
Degree: 2012, University of Johannesburg
URL: http://hdl.handle.net/10210/6304
► M.Sc.
Loss of quality occurs when tomatoes are stored for more than approximately 3-5 weeks at 12 °C. The most common disorders found in tomatoes…
(more)
▼ M.Sc.
Loss of quality occurs when tomatoes are stored for more than approximately 3-5 weeks at 12 °C. The most common disorders found in tomatoes during storage are colour development to an unacceptable shade of red, softening, shrivelling due to moisture loss, loss of flavour and fungal infections. Storage life of tomatoes is generally extended by storage under refrigeration. Further, extension of shelf life can be achieved by modified atmosphere packaging (MAP). This is done by sealing actively respiring produce in polymeric film packages to modify the 0, and CO, levels within the package atmosphere. Also, 1-methylcyclopropene (1-MCP) has been proven to be an effective postharvest treatment to prolong the storage life of tomatoes. In the present study four trails were conducted. In the first trial the effects of 1-MCP dosage rate and the colour stage of harvest on the quality of `Santa' tomatoes stored for 4 weeks at 12 °C were investigated. The results indicated that ripening related changes were delayed following 1-MCP treatment. 1-MCP treated fruit were firmer, had reduced TA losses, slower colour development, and reduced physiological disorders associated with long term storage. The stage of ripeness influenced the efficacy of 1-MCP on slowing down the tomato ripening process. 1-MCP was of little benefit for fruit treated at stage 4 of ripeness. In contrast, particularly when the 1-MCP dosage was high, 1-MCP markedly delayed ripening in fruit harvested at colour stage 2 and 3, but the quality attributes such as SSC were better in treated fruits harvested at stage 3. Relatively little difference was observed between 250 and 500 nL.L -I 1-MCP and thus 500 nL.Con fruit harvested at stage 3 of ripeness was used in the remaining experiments. Effects of MAP, 1-MCP and imazalil either as combined treatments or as single treatments were studied for their effect on the quality of tomatoes. Ripening related changes were delayed and loss of weight was significantly reduced following 1-MCP treatment and MA packaging in 17 gm thickness bags. Elevated CO, in MAP after a long storage period induced anaerobic metabolism with the generation of off-odurs and the proliferation of anaerobic microbes. Selected doses of imazalil (0, 0.5, 0.05, 0.005 and 0.0005 g.L.1 ) were evaluated for their effect on the fungal infections on tomato fruits. Imazalil at a rate of 0.005 g.L"' was found to reduce fungal infections by 50% when used in combination with MAP and 1-MCP. The combination of imazalil and MAP therefore appears to be the best treatment combination to facilitate export of 'Santa' tomatoes by sea. However, with regards to reducing the loss of TA, treatment with 1-MCP would be beneficial.
Subjects/Keywords: Tomatoes - Postharvest physiology - Research - South Africa.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mhlophe, S. D. (2012). Use of 1-methylcyclopropene, modified atmosphere and imazalil to extend the storage life of 'Santa' tomatoes. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/6304
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mhlophe, Sibongile Dorothy. “Use of 1-methylcyclopropene, modified atmosphere and imazalil to extend the storage life of 'Santa' tomatoes.” 2012. Thesis, University of Johannesburg. Accessed January 16, 2021.
http://hdl.handle.net/10210/6304.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mhlophe, Sibongile Dorothy. “Use of 1-methylcyclopropene, modified atmosphere and imazalil to extend the storage life of 'Santa' tomatoes.” 2012. Web. 16 Jan 2021.
Vancouver:
Mhlophe SD. Use of 1-methylcyclopropene, modified atmosphere and imazalil to extend the storage life of 'Santa' tomatoes. [Internet] [Thesis]. University of Johannesburg; 2012. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10210/6304.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mhlophe SD. Use of 1-methylcyclopropene, modified atmosphere and imazalil to extend the storage life of 'Santa' tomatoes. [Thesis]. University of Johannesburg; 2012. Available from: http://hdl.handle.net/10210/6304
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Pretoria
16.
Havenga, Wilma.
Mode of action
of Bacillus subtilis ATCC 55466 as biocontrol agent of postharvest
diseases of avocados.
Degree: Microbiology and Plant
Pathology, 2011, University of Pretoria
URL: http://hdl.handle.net/2263/28370
► Avocados are an economically important crop in South Africa and are mainly exported to Europe. As with any other tropical and subtropical crop, avocados are…
(more)
▼ Avocados are an economically important crop in South
Africa and are mainly exported to Europe. As with any other
tropical and subtropical crop, avocados are prone to pre- and
postharvest diseases. Until recently, chemical control was the only
effective measure to control fungal avocado pathogens In 1987, a
Bacillus subtilis isolate was found that showed promise as a
biocontrol agent in both pre- and
postharvest applications to
control
postharvest diseases. However, over time variable results
has been obtained in semi commercial trials. From the original B.
subtilis isolate several subcultures have been made and used over a
15 year period in various experimental trials. The dual culture
technique was used to compare the biocontrol activity of the
subcultures against
postharvest pathogens (Colletotrichum
gloeosporioides, Phomopsis perseae, Dothiorella aromatica and
Lasiodiplodia theobromae). The subcultures differed significantly
in their effectiveness and genetic stability. No difference between
the subcultures could be found when DNA fingerprinting using RISA
PCR was used. The most effective subculture, MI-14, was used in
further studies. The mode of action employed by a biocontrol agent
is of utmost importance and can be used to enhance its efficacy. In
a previous study it was hypothesized that antibiosis as well as
competition for nutrients and space is the modes of action involved
in biocontrol of B. subtilis against
postharvest pathogens of
avocado. The direct interaction between B. subtilis and C.
gloeosporioides on avocado fruit were observed using scanning
electron microscopy. Cells of B. subtilis were observed to colonize
the hyphae of C gloeosporioides. In some instances, hyphal walls
were lysed in the presence of B. subtilis and may be due to the
presence of enzymes or antibiotic substances. Conidia of C.
gloeosporioides did not germinate in the presence of B. subtilis.
Diffusible inhibitory metabolites active against C. gloeosporioides
were produced in vitro by B. subtilis. Inhibitory volatile
substances were also produced by B. subtilis and were found to be
active against P. perseae, D. aromatica and L. theobromae but not
C. gloeosporioides. Siderophores production as well as chitinase,
amylase, lipase and proteinase activity were also observed and may
play a role in antagonism. Antibiotic production by B. subtilis is
a well-known phenomenon. Most antibiotics are polypeptides and
lipopeptides. The involvement of phenolic metabilites in biocontrol
by B subtilis is less known. A seven-day-old culture of B. subtilis
in a minimal medium was analyzed for the presence of free acid
phenolic compounds active against fungi. Free acid phenolic
metabolites were found and separated using layer chromatography.
TLC plates containing the separated spots were sprayed with
Clasdosporium cladosporioides and plates were observed for
inhibition zones. The phenolic substances were present at 7.06 ±
0.95 mg gallic acid ml-1. The phenolic substances fall in the
hydroxycinamic acid group due to their fluorescent coloring under…
Advisors/Committee Members: Prof L Korsten (advisor).
Subjects/Keywords: Bacillus
subtilis;
Avocados; Postharvest
diseases;
UCTD
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Havenga, W. (2011). Mode of action
of Bacillus subtilis ATCC 55466 as biocontrol agent of postharvest
diseases of avocados. (Masters Thesis). University of Pretoria. Retrieved from http://hdl.handle.net/2263/28370
Chicago Manual of Style (16th Edition):
Havenga, Wilma. “Mode of action
of Bacillus subtilis ATCC 55466 as biocontrol agent of postharvest
diseases of avocados.” 2011. Masters Thesis, University of Pretoria. Accessed January 16, 2021.
http://hdl.handle.net/2263/28370.
MLA Handbook (7th Edition):
Havenga, Wilma. “Mode of action
of Bacillus subtilis ATCC 55466 as biocontrol agent of postharvest
diseases of avocados.” 2011. Web. 16 Jan 2021.
Vancouver:
Havenga W. Mode of action
of Bacillus subtilis ATCC 55466 as biocontrol agent of postharvest
diseases of avocados. [Internet] [Masters thesis]. University of Pretoria; 2011. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/2263/28370.
Council of Science Editors:
Havenga W. Mode of action
of Bacillus subtilis ATCC 55466 as biocontrol agent of postharvest
diseases of avocados. [Masters Thesis]. University of Pretoria; 2011. Available from: http://hdl.handle.net/2263/28370
University of Guelph
17.
Ige, Oderonke Dorothy.
Comparison of the quality aspects of organic and conventional green beans (Phaseolus vulgaris L.).
Degree: MS, Department of Plant Agriculture, 2012, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3505
► The nutritional quality and antioxidant activity of organic and conventional green beans were compared in a series of experiments. Firmness, percent dry matter, carotenoids and…
(more)
▼ The nutritional quality and antioxidant activity of organic and conventional green beans were compared in a series of experiments. Firmness, percent dry matter, carotenoids and chlorophyll contents, respiration rate, vitamin C and proteins were evaluated. Hydroxyl radical scavenging activity, SOD, APX and POX were also analysed. In a second experiment, organic green beans treated with hexanal formulations were stored with untreated at 12⁰C in the refrigerator for a period of three weeks during two seasons. The results of the experiment showed higher levels of most of the parameters measured in organic green beans (with significant differences in firmness, carotenoids and chlorophyll b), except for respiration, vitamin C, antioxidant activity(hydroxyl radical scavenging) and APX where conventional green beans were higher and showed significant differences in respiration and vitamin C. The storage experiment showed a decrease in firmness and fresh weight and increase in respiration during storage for both seasons. Carotenoids and chlorophyll contents showed decrease in concentrations during the first week and increased during the second week of storage.
Advisors/Committee Members: Paliyath, Gopinadhan (advisor).
Subjects/Keywords: Green beans; Quality; Antioxidant; Organic; Conventional; Postharvest
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ige, O. D. (2012). Comparison of the quality aspects of organic and conventional green beans (Phaseolus vulgaris L.). (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3505
Chicago Manual of Style (16th Edition):
Ige, Oderonke Dorothy. “Comparison of the quality aspects of organic and conventional green beans (Phaseolus vulgaris L.).” 2012. Masters Thesis, University of Guelph. Accessed January 16, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3505.
MLA Handbook (7th Edition):
Ige, Oderonke Dorothy. “Comparison of the quality aspects of organic and conventional green beans (Phaseolus vulgaris L.).” 2012. Web. 16 Jan 2021.
Vancouver:
Ige OD. Comparison of the quality aspects of organic and conventional green beans (Phaseolus vulgaris L.). [Internet] [Masters thesis]. University of Guelph; 2012. [cited 2021 Jan 16].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3505.
Council of Science Editors:
Ige OD. Comparison of the quality aspects of organic and conventional green beans (Phaseolus vulgaris L.). [Masters Thesis]. University of Guelph; 2012. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3505
University of South Africa
18.
Maluleke, Mdungazi Knox.
Determination of the optimal preservatives for preventing stem bending of Gebera jamesonii "Black Diamond"
.
Degree: 2016, University of South Africa
URL: http://hdl.handle.net/10500/23269
► Postharvest stem bending is one of the most detrimental factors that affect postharvest quality life of Gerbera jamesonii cutflower varieties. Stem bending is of economic…
(more)
▼ Postharvest stem bending is one of the most detrimental factors that affect
postharvest quality life of Gerbera jamesonii cutflower varieties. Stem bending is of economic importance in the cutflower industry in South Africa because it negatively affects the overall total sales. Growers and retailers want to improve the
postharvest vaselife of this crop using suitable preservatives. The aim of this study was to determine suitable preservatives and optimal vaselife conditions that could prevent or minimise
postharvest stem bending of Gerbera jamesonii “Black diamond”.
The variety “Black diamond was selected and treated with four different floral preservative solutions. The relationship between stem bending and absorption rate of the preservative solutions was established. The data gathered indicated that there was a significant difference to the solution absorption rate and stem bending. Stem bending differed from 0 to 38 degrees. Stems treated on control, preservative 3 and 4 recorded the highest degrees of bending, while preservative 1 and 2 recorded the lowest degrees of stem bending within 12 day period. The performance results of the preservatives and control repeated three times under the same experimental conditions showed that preservative 1 and 2 can be used to minimise
postharvest stem bending of Gerbera jamesonii ‘Black diamond’
Advisors/Committee Members: Moja, S. J (advisor), Van Staden, E. M (advisor).
Subjects/Keywords: Cutflowers;
Gerbera jamesonii;
Postharvest;
Preservatives;
Stem bending
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Maluleke, M. K. (2016). Determination of the optimal preservatives for preventing stem bending of Gebera jamesonii "Black Diamond"
. (Masters Thesis). University of South Africa. Retrieved from http://hdl.handle.net/10500/23269
Chicago Manual of Style (16th Edition):
Maluleke, Mdungazi Knox. “Determination of the optimal preservatives for preventing stem bending of Gebera jamesonii "Black Diamond"
.” 2016. Masters Thesis, University of South Africa. Accessed January 16, 2021.
http://hdl.handle.net/10500/23269.
MLA Handbook (7th Edition):
Maluleke, Mdungazi Knox. “Determination of the optimal preservatives for preventing stem bending of Gebera jamesonii "Black Diamond"
.” 2016. Web. 16 Jan 2021.
Vancouver:
Maluleke MK. Determination of the optimal preservatives for preventing stem bending of Gebera jamesonii "Black Diamond"
. [Internet] [Masters thesis]. University of South Africa; 2016. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10500/23269.
Council of Science Editors:
Maluleke MK. Determination of the optimal preservatives for preventing stem bending of Gebera jamesonii "Black Diamond"
. [Masters Thesis]. University of South Africa; 2016. Available from: http://hdl.handle.net/10500/23269
Clemson University
19.
Enfield, Amy.
INFLUENCE OF THE POSTHARVEST ENVIRONMENT ON THE STORAGE POTENTIAL AND PROPAGATION PERFORMANCE OF UNROOTED CUTTINGS OF HERBACEOUS ORNAMENTALS.
Degree: PhD, Plant and Environmental Science, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/792
► Plants propagated from vegetative cuttings have become an increasingly important market in the United States. Significant economic losses occur annually due to poor performance, damage…
(more)
▼ Plants propagated from vegetative cuttings have become an increasingly important market in the United States. Significant economic losses occur annually due to poor performance, damage or death of cuttings. This occurs in large part due to the industry's lack of knowledge of the proper
postharvest environments to provide to cuttings. This project was conducted to improve the understanding of the
postharvest physiology of unrooted cuttings in order to optimize performance and longevity. Experiments were conducted to quantify the effect of temperature on respiration and ethylene production rates of unrooted cuttings. Additionally, the effect of the stock plant environment on the initial carbohydrate concentration of cuttings and the subsequent
postharvest performance was also explored. Respiration rates of vegetative cuttings were greatest 2 h after harvest and decreased rapidly during the first 24 h. As
postharvest temperature increased, the initial respiration rate increased. Regardless of how long poinsettia cuttings were stored at 10 °, when they were transferred to 20 ° respiration rates increased. A decline in rooting quality was noticeable 2 to 4 d prior to a decline in shoot quality. Storage potential of poinsettia cuttings was maximal at 10°. Ethylene production in vegetative cuttings was directly correlated to storage temperature. As storage temperature increased, ethylene production increased. Poinsettia cuttings harvested in the evening produced more ethylene than cuttings harvested in the morning. Stock plant growing environment also impacts cutting
postharvest performance. Adventitious root formation in propagation is related to the carbohydrate status of the unrooted cuttings. Carbohydrate levels were 2.5-times greater in plants that were grown in high-light than plants grown in low-light conditions. Carbohydrate status was not significantly correlated with ethylene production; however, rooting performance was positively correlated with carbohydrate status, as carbohydrate concentrations increased, rooting increased.
Advisors/Committee Members: Brown-Faust, James, Rajapakse , Nihal, Whiteside , William S, Adelberg , Jeffrey.
Subjects/Keywords: ethylene; postharvest; respiration; vegetative cuttings; Horticulture
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Enfield, A. (2011). INFLUENCE OF THE POSTHARVEST ENVIRONMENT ON THE STORAGE POTENTIAL AND PROPAGATION PERFORMANCE OF UNROOTED CUTTINGS OF HERBACEOUS ORNAMENTALS. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/792
Chicago Manual of Style (16th Edition):
Enfield, Amy. “INFLUENCE OF THE POSTHARVEST ENVIRONMENT ON THE STORAGE POTENTIAL AND PROPAGATION PERFORMANCE OF UNROOTED CUTTINGS OF HERBACEOUS ORNAMENTALS.” 2011. Doctoral Dissertation, Clemson University. Accessed January 16, 2021.
https://tigerprints.clemson.edu/all_dissertations/792.
MLA Handbook (7th Edition):
Enfield, Amy. “INFLUENCE OF THE POSTHARVEST ENVIRONMENT ON THE STORAGE POTENTIAL AND PROPAGATION PERFORMANCE OF UNROOTED CUTTINGS OF HERBACEOUS ORNAMENTALS.” 2011. Web. 16 Jan 2021.
Vancouver:
Enfield A. INFLUENCE OF THE POSTHARVEST ENVIRONMENT ON THE STORAGE POTENTIAL AND PROPAGATION PERFORMANCE OF UNROOTED CUTTINGS OF HERBACEOUS ORNAMENTALS. [Internet] [Doctoral dissertation]. Clemson University; 2011. [cited 2021 Jan 16].
Available from: https://tigerprints.clemson.edu/all_dissertations/792.
Council of Science Editors:
Enfield A. INFLUENCE OF THE POSTHARVEST ENVIRONMENT ON THE STORAGE POTENTIAL AND PROPAGATION PERFORMANCE OF UNROOTED CUTTINGS OF HERBACEOUS ORNAMENTALS. [Doctoral Dissertation]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_dissertations/792
University of Arkansas
20.
Barchenger, Derek.
Postharvest Storage and Nutraceutical Evaluation of Muscadine Grapes (Vitis rotundifolia Michx.).
Degree: MS, 2014, University of Arkansas
URL: https://scholarworks.uark.edu/etd/2364
► A major limiting factor in muscadine grape (Vitis rotundifolia Michx.) commercialization is deterioration during storage. One solution for extending market seasons and preventing market…
(more)
▼ A major limiting factor in muscadine grape (Vitis rotundifolia Michx.) commercialization is deterioration during storage. One solution for extending market seasons and preventing market saturation for fresh muscadines could be the release of new cultivars with improved
postharvest storability. Three studies were conducted; Study 1: The effect of fungicide treatments on muscadine genotype
postharvest storage and nutraceutical content; Study 2: An evaluation of a diverse range of genotypes for
postharvest storage potential and nutraceutical concentrations; and Study 3: The impact of
postharvest storage and berry segment on the nutraceutical composition of `Supreme'. Research on table grapes has shown that field fungicide applications increase storability, but little is known of their effect on muscadines. The effect of field applications of fungicides on composition attributes during
postharvest storage was evaluated on five muscadine cultivars (Nesbitt, Southern Jewel, Summit, Supreme, and Tara) and five breeding selections from the University of Arkansas Fruit Breeding Program. There were two field treatments (no fungicide and fungicide). For the fungicide treatment, alternating applications of two fungicides were applied at 14 d intervals during berry development. Fruit was harvested and composition attributes including berry volume, titratable acidity (TA), pH, soluble solids (%), soluble solids to titratable acidity ratio (SS/TA), color (L*, Chroma, and hue), firmness (force to penetrate berry skins), weight loss (%), and unmarketable fruit (%) were evaluated every 7 d for three weeks. An additional eight cultivars and selections from non-fungicide-treated vines were subjected to
postharvest storage potential evaluations. These included AM 02, AM 03, AM 18, AM 26, AM 28, `Delicious', `Fry', and `Ison', as well as the genotypes from the non-fungicide-sprayed vines of genotypes in Study 1 (AM 01, AM 04, AM 15, AM 27, `Nesbitt', `Southern Jewel', `Summit', `Supreme', and `Tara') to broaden the evaluation and comparison among genotypes for
postharvest storage potential, and aid in the development of an Arkansas muscadine storage protocol. Additionally, a third study was conducted with `Supreme' to determine the retention of nutraceutical compounds during storage on the berry segments of flesh (pulp and skin), seeds, and whole berries and to evaluate the variability in nutraceutical compounds among different vine of a single genotype. The storage attributes of force to penetrate the berry skin, percent weight loss, and percent unmarketable were all improved with fungicide applications, while the difference in percent volume change was minimal. Field fungicide applications had no effect on muscadine berry color (Chroma, hue angle, and L*) or berry composition (pH, TA, SS/TA, and soluble solids). There were some effects of field fungicide applications impacted some nutraceutical levels, however results varied. Weight loss, percent unmarketable, and force have potential for routine measurements in
postharvest…
Advisors/Committee Members: John R. Clark, Renee T. Threlfall, M. Elana Garcia.
Subjects/Keywords: Fungicide; Muscadine; Nutraceuticals; Postharvest; Storage; Horticulture
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Barchenger, D. (2014). Postharvest Storage and Nutraceutical Evaluation of Muscadine Grapes (Vitis rotundifolia Michx.). (Masters Thesis). University of Arkansas. Retrieved from https://scholarworks.uark.edu/etd/2364
Chicago Manual of Style (16th Edition):
Barchenger, Derek. “Postharvest Storage and Nutraceutical Evaluation of Muscadine Grapes (Vitis rotundifolia Michx.).” 2014. Masters Thesis, University of Arkansas. Accessed January 16, 2021.
https://scholarworks.uark.edu/etd/2364.
MLA Handbook (7th Edition):
Barchenger, Derek. “Postharvest Storage and Nutraceutical Evaluation of Muscadine Grapes (Vitis rotundifolia Michx.).” 2014. Web. 16 Jan 2021.
Vancouver:
Barchenger D. Postharvest Storage and Nutraceutical Evaluation of Muscadine Grapes (Vitis rotundifolia Michx.). [Internet] [Masters thesis]. University of Arkansas; 2014. [cited 2021 Jan 16].
Available from: https://scholarworks.uark.edu/etd/2364.
Council of Science Editors:
Barchenger D. Postharvest Storage and Nutraceutical Evaluation of Muscadine Grapes (Vitis rotundifolia Michx.). [Masters Thesis]. University of Arkansas; 2014. Available from: https://scholarworks.uark.edu/etd/2364
Kansas State University
21.
McDaniel, Austin.
Effective
pack practices to control postharvest diseases in small
berries.
Degree: MS, Food Science
Institute, 2019, Kansas State University
URL: http://hdl.handle.net/2097/40073
► Postharvest losses can occur anywhere from harvesting to handling and shipping. In 2014, approximately $30 billion of fresh produce were lost in the United States…
(more)
▼ Postharvest losses can occur anywhere from harvesting
to handling and shipping. In 2014, approximately $30 billion of
fresh produce were lost in the United States food supply chain. In
particular, small fruits shelf-life can be reduced by weight loss,
stem scar injury, gray mold and ripe rot. It is important therefore
to find sustainable packing alternatives to protect produce,
increase shelf-life, minimize waste, and preserve resources. The
objectives of this study were to: 1) evaluate the mechanical,
physical and anti-fungal properties of pullulan packaging films
loaded with essential oil (EO) nanoemulsions; 2) investigate the
effectiveness of the formulated active packaging systems to extend
shelf-life and enhance strawberries’ quality.
Food-grade
emulsions with sub-micron droplets were used to encapsulate
cinnamaldehyde (CIN), eugenol (EUG) and thymol (THY) within either
a refined coconut oil (carrier) or palm stearin in pullulan
packaging systems. Different film combinations loaded with EO
nanoemulsions were studied. Tensile strength, moisture content and
antifungal activity against Rhizopus stolonifer, Alternaria spp.,
and Aspergillus niger were measured and compared to control
pullulan systems. A lower tensile strength (P > 0.05) was
measured for combinations loaded with EO nanoemulsions as compared
to films without active lipid solutions. Nevertheless, the active
combinations presented good elasticity and ductility. The control
formulations showed no antifungal activity. Conversely, active
combinations exhibited significant inhibition zones against
postharvest fungi (P < 0.05). Film containing CIN had the
biggest inhibition halos: 13.7, 15.7 and 14.5 mm were measured
against R. stolonifer, Alternaria and A. niger, respectively.
Pullulan films incorporated with CIN nanoemulsions were selected
for the field study. Fresh strawberries were harvested from a local
farm in Kansas and separated into two groups (control and
treatment). For each group, 10 strawberries were placed into a
molded fiber berry basket. A pullulan film was added at the bottom
of each container for the treated group. Samples were stored for up
to 10 days at 3°C and 12°C. Every 2 days microbial, visual, and
physiological quality parameters were evaluated. For treated
strawberries stored at 3°C, a reduction of 2 log CFU/g in yeast and
mold population was observed over the 10-day period (P <0.05),
as compared to the control. An improvement in visual quality was
noted for treated berries at both storage temperatures as compared
to the control group. Overall, a reduction of fungal and quality
decay in strawberries packaged with pullulan films incorporated
with nanoemulsions was observed. This study demonstrates the
potential application of pullulan active packaging systems as a
mean of controlling and reducing
postharvest disease in small
fruits during shipping and storage.
Advisors/Committee Members: Valentina TrinettaUmut Yucel.
Subjects/Keywords: Postharvest; Active
Packaging; Essential
Oils;
Pullulan
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
McDaniel, A. (2019). Effective
pack practices to control postharvest diseases in small
berries. (Masters Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/40073
Chicago Manual of Style (16th Edition):
McDaniel, Austin. “Effective
pack practices to control postharvest diseases in small
berries.” 2019. Masters Thesis, Kansas State University. Accessed January 16, 2021.
http://hdl.handle.net/2097/40073.
MLA Handbook (7th Edition):
McDaniel, Austin. “Effective
pack practices to control postharvest diseases in small
berries.” 2019. Web. 16 Jan 2021.
Vancouver:
McDaniel A. Effective
pack practices to control postharvest diseases in small
berries. [Internet] [Masters thesis]. Kansas State University; 2019. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/2097/40073.
Council of Science Editors:
McDaniel A. Effective
pack practices to control postharvest diseases in small
berries. [Masters Thesis]. Kansas State University; 2019. Available from: http://hdl.handle.net/2097/40073
University of Georgia
22.
Wright, Joy Marie.
Evaluation and chemical characterization of postharvest degreened bell peppers (Capsicum annuum).
Degree: 2014, University of Georgia
URL: http://hdl.handle.net/10724/20712
► Bell peppers are used as foods or flavorings and are consumed as green or colored fruits. During pepper season many green bells are sold at…
(more)
▼ Bell peppers are used as foods or flavorings and are consumed as green or colored fruits. During pepper season many green bells are sold at or below cost or rot in the field rather than being sold. Colored bells command a higher market price
and provide an alternate channel for the pepper crop. We investigated the potential of an on-farm degreening process for bell peppers. Ethylene treatments did not assist the degreening process. Holding sufficiently mature peppers at 20°C/90% relative
humidity (RH) provided significant degreening. The storage life of the degreened peppers was 7 to 14 days. With precautions against decay, this should allow sufficient time for distribution. Pepper maturation results in flavor and nutritional quality
differences. These characteristics of degreened peppers were studied, the expected changes occurred. Ascorbic acid, dry matter, and total soluble solids increased with maturation; titratable acidity and pH decreased. Volatile levels also decreased with
maturation.
Subjects/Keywords: Bell peppers; Capsicum annuum; maturation; degreening; Postharvest
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wright, J. M. (2014). Evaluation and chemical characterization of postharvest degreened bell peppers (Capsicum annuum). (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/20712
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wright, Joy Marie. “Evaluation and chemical characterization of postharvest degreened bell peppers (Capsicum annuum).” 2014. Thesis, University of Georgia. Accessed January 16, 2021.
http://hdl.handle.net/10724/20712.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wright, Joy Marie. “Evaluation and chemical characterization of postharvest degreened bell peppers (Capsicum annuum).” 2014. Web. 16 Jan 2021.
Vancouver:
Wright JM. Evaluation and chemical characterization of postharvest degreened bell peppers (Capsicum annuum). [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10724/20712.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wright JM. Evaluation and chemical characterization of postharvest degreened bell peppers (Capsicum annuum). [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/20712
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Georgia
23.
Sparks, Sara Ashley.
Postharvest handling systems for fresh fruits and vegetables in sub-Saharan Africa and potential enhancement by the Aid for Trade initiative.
Degree: 2014, University of Georgia
URL: http://hdl.handle.net/10724/28912
► To address food insecurity and high levels of postharvest loss in developing countries the postharvest handling systems in sub-Saharan Africa were characterized using a systems…
(more)
▼ To address food insecurity and high levels of postharvest loss in developing countries the postharvest handling systems in sub-Saharan Africa were characterized using a systems approach. The Commodity Systems Assessment Methodology (CSAM)
and analysis of interview transcripts were used to develop six models representing the postharvest handling system of four crops. Completion of the models identified areas where postharvest technologies could be most effective in reducing postharvest
loss in the food system. The potential of Aid for Trade to provide support for developing countries was explored. Allocations have the potential to provide needed linkages within the postharvest handling system to reduce loss. Investments in the economy,
trade capacity, and infrastructure of developing countries could improve the efficiency and reduce observed postharvest loss.
Subjects/Keywords: postharvest; postharvest handling; systems; fruit; vegetable; CSAM; aid for trade; developing countries
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sparks, S. A. (2014). Postharvest handling systems for fresh fruits and vegetables in sub-Saharan Africa and potential enhancement by the Aid for Trade initiative. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/28912
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sparks, Sara Ashley. “Postharvest handling systems for fresh fruits and vegetables in sub-Saharan Africa and potential enhancement by the Aid for Trade initiative.” 2014. Thesis, University of Georgia. Accessed January 16, 2021.
http://hdl.handle.net/10724/28912.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sparks, Sara Ashley. “Postharvest handling systems for fresh fruits and vegetables in sub-Saharan Africa and potential enhancement by the Aid for Trade initiative.” 2014. Web. 16 Jan 2021.
Vancouver:
Sparks SA. Postharvest handling systems for fresh fruits and vegetables in sub-Saharan Africa and potential enhancement by the Aid for Trade initiative. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10724/28912.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sparks SA. Postharvest handling systems for fresh fruits and vegetables in sub-Saharan Africa and potential enhancement by the Aid for Trade initiative. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/28912
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Massey University
24.
Li, Mo.
Developing non-destructive techniques to predict 'Hayward' kiwifruit storability.
Degree: PhD, Food Technology, 2017, Massey University
URL: http://hdl.handle.net/10179/13147
► A significant portion of New Zealand’s kiwifruit production is held as stock in local coolstores for extended periods of time before being exported. Many pre-harvest…
(more)
▼ A significant portion of New Zealand’s kiwifruit production is held as stock in
local coolstores for extended periods of time before being exported. Many pre-harvest
factors contribute to variation in fruit quality at harvest and during coolstorage, and
results in the difficulty in segregating fruit for their storage outcomes. The objective of
this work was to develop non-destructive techniques utilised at harvest to predict
storability of individual or batches of ‘Hayward’ kiwifruit based on (near) skin
properties. Segregation of fruit with low storage potential at harvest could enable that
fruit to be sold earlier in the season reducing total fruit loss and improving profitability
later in the season.
The potential for optical coherence tomography (OCT) to detect near surface
cellular structural differences in kiwifruit as a result of preharvest factors was
demonstrated through quantitative image analysis of 3D OCT images of intact fruit
from five commercial cultivars. Visualisation and characterisation of large parenchyma
cells in the outer pericarp of kiwifruit was achieved by developing an automated image
processing technique. This work established the usefulness of OCT to perform rapid
analysis and differentiation of the microstructures of sub-surface cells between kiwifruit
cultivars. However, the effects of preharvest conditions between batches of fruit within
a cultivar were not detectable from image analysis and hence, the ability to provide
segregation or prediction for fruit from the same cultivar was assumed to be limited.
Total soluble solids concentration (TSS) and flesh firmness (FF) are two
important quality attributes indicating the eating quality and storability of stored
kiwifruit. Prediction of TSS and FF using non-destructive techniques would allow
strategic marketing of fruit. This work demonstrated that visible-near-infrared (Vis-NIR)
spectroscopy could be utilised as the sole input at harvest, to provide quantitative
prediction of post-storage TSS by generating blackbox regression models. However the
level of accuracy achieved was not adequate for online sorting purposes. Quantitative
prediction of FF remained unsuccessful. Improved ways of physical measurements for
FF may help reduce the undesirable variation observed on the same fruit and increase
prediction capability.
More promising results were obtained by developing blackbox classification models using Vis-NIR spectroscopy at harvest to segregate storability of individual kiwifruit based on the export FF criterion of 1 kgf (9.8 N). Through appropriate machine learning techniques, the surface properties of fruit at harvest captured in the form of spectral data were correlated to post-storage FF via pattern recognition. The best prediction was obtained for fruit stored at 0°C for 125 days: approximately 50% of the soft fruit and 80% of the good fruit could be identified. The developed model was capable of performing classification both within (at the fruit level) and between grower lines. Model validation…
Subjects/Keywords: Kiwifruit;
Postharvest physiology;
Postharvest technology;
Storage;
Research Subject Categories::TECHNOLOGY::Chemical engineering::Food technology
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Li, M. (2017). Developing non-destructive techniques to predict 'Hayward' kiwifruit storability. (Doctoral Dissertation). Massey University. Retrieved from http://hdl.handle.net/10179/13147
Chicago Manual of Style (16th Edition):
Li, Mo. “Developing non-destructive techniques to predict 'Hayward' kiwifruit storability.” 2017. Doctoral Dissertation, Massey University. Accessed January 16, 2021.
http://hdl.handle.net/10179/13147.
MLA Handbook (7th Edition):
Li, Mo. “Developing non-destructive techniques to predict 'Hayward' kiwifruit storability.” 2017. Web. 16 Jan 2021.
Vancouver:
Li M. Developing non-destructive techniques to predict 'Hayward' kiwifruit storability. [Internet] [Doctoral dissertation]. Massey University; 2017. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10179/13147.
Council of Science Editors:
Li M. Developing non-destructive techniques to predict 'Hayward' kiwifruit storability. [Doctoral Dissertation]. Massey University; 2017. Available from: http://hdl.handle.net/10179/13147
Stellenbosch University
25.
Smit, Renate.
Postharvest phytosanitary disinfestation strategies using thermal and atmospheric stress: commodity and insect tolerances.
Degree: PhD, Conservation Ecology and Entomology, 2019, Stellenbosch University
URL: http://hdl.handle.net/10019.1/107254
► ENGLISH ABSTRACT: South African chill sensitive horticultural products deemed for export cannot be exported using certain phytosanitary cold sterilisation regimes, without negatively affecting fruit quality.…
(more)
▼ ENGLISH ABSTRACT: South African chill sensitive horticultural products deemed for export cannot be exported using certain phytosanitary cold sterilisation regimes, without negatively affecting fruit quality. Low temperature phytosanitary treatments are required to control a variety of pests, however in some cases, cold temperature treatments are ineffective against insects that display high levels of thermal tolerance. Developing alternative phytosanitary treatments is therefore crucial, and maintaining a balance between desirable fruit quality and effective control of insect pests is an important consideration throughout the process. In the present study, the potential of two
postharvest mitigation technologies were investigated to assess their potential in controlling targeted pests while maintaining fruit quality - CATTS (Controlled Atmosphere Temperature Treatment System) and ethyl formate fumigation. CATTS was investigated specifically as a potential
postharvest mitigation treatment for chill sensitive plum cultivars. CATTS technology incorporates heat and atmospheric stress to control insect pests. Key phytosanitary pests of South Africa which require control include the grain chinch bug, Macchiademus diplopterus (Distant) (Hemiptera: Lygaeidae), the banded fruit weevil, Phlyctinus callosus (Schöenherr) (Coleoptera: Curculionidae) and the false codling moth, Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae). In the first part of this dissertation, different temperature treatments in combination with controlled atmosphere were tested and fruit was cold-stored using two different cold storage regimes, namely standard cold sterilisation and the dual temperature regime, to examine the effectiveness of the CATTS treatments and cold storage for phytosanitary control. Finding a balance to maintain fruit quality and kill both internal and external pests proved challenging. As a pre-conditioning benefit of heat treatments was observed during the first season, treatments were aimed at enhancing this effect during the second season, to enable the fruit to withstand low temperatures for longer periods to control internal pests. The second part of this dissertation is an in-depth investigation into the physiology of Macchiademus diplopterus. This was conducted to provide insight into the thermo-tolerant ability of this pest, as CATTS treatments were found to be ineffective for phytosanitary control. The compositional changes that occur during aestivation were examined through biochemical (macromolecules) and molecular (soluble protein identification) analyses. These were performed on the insects before entering aestivation and during the aestivation period. To examine the biochemical compositional changes the insect undergoes during thermal stresses, insects from early and mid-aestivation were treated with different CATTS treatments and cold storage regimes (cold sterilisation and dual temperature regime). The insect mortality and macromolecule content in each aestivation period provided insight into the…
Advisors/Committee Members: Johnson, Shelley A., Jooste, Mariana, Addison, Pia, Stellenbosch University. Faculty of Agrisciences. Dept. of Conservation Ecology and Entomology..
Subjects/Keywords: Horticultural products; Phytosanitation; Fruit – Quality; Postharvest diseases and injuries – Biological control; Crops – Postharvest technology; Plant products – Postharvest physiology; Controlled Atmosphere Temperature Treatment System; UCTD
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Smit, R. (2019). Postharvest phytosanitary disinfestation strategies using thermal and atmospheric stress: commodity and insect tolerances. (Doctoral Dissertation). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/107254
Chicago Manual of Style (16th Edition):
Smit, Renate. “Postharvest phytosanitary disinfestation strategies using thermal and atmospheric stress: commodity and insect tolerances.” 2019. Doctoral Dissertation, Stellenbosch University. Accessed January 16, 2021.
http://hdl.handle.net/10019.1/107254.
MLA Handbook (7th Edition):
Smit, Renate. “Postharvest phytosanitary disinfestation strategies using thermal and atmospheric stress: commodity and insect tolerances.” 2019. Web. 16 Jan 2021.
Vancouver:
Smit R. Postharvest phytosanitary disinfestation strategies using thermal and atmospheric stress: commodity and insect tolerances. [Internet] [Doctoral dissertation]. Stellenbosch University; 2019. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10019.1/107254.
Council of Science Editors:
Smit R. Postharvest phytosanitary disinfestation strategies using thermal and atmospheric stress: commodity and insect tolerances. [Doctoral Dissertation]. Stellenbosch University; 2019. Available from: http://hdl.handle.net/10019.1/107254
Stellenbosch University
26.
Meyer, Celeste.
Carbohydrates and leaf blackening of Protea cut flowers.
Degree: MScAgric, Horticultural Sciences, 2003, Stellenbosch University
URL: http://hdl.handle.net/10019.1/53320
► ENGLISH ABSTRACT: Protea cut flowers are exported worldwide but the vase life of some species and cultivars is considerably shortened by post-harvest leaf blackening. Research…
(more)
▼ ENGLISH ABSTRACT: Protea cut flowers are exported worldwide but the vase life of some species and cultivars
is considerably shortened by post-harvest leaf blackening. Research has established
carbohydrate depletion to be positively correlated with this disorder. Consequently, a
study had been made of the carbohydrate status of various species and cultivars, as well
as the effect of supplemental glucose (pre and post-storage) on leaf blackening.
Glucose, fructose, sucrose and starch concentrations of various Protea species and
cultivars held in water were measured at harvest, and again at leaf blackening initiation.
All measured carbohydrates declined significantly in 'Carnival', 'Pink Ice' and 'Sheila'.
In 'Cardinal' all carbohydrate concentrations decreased significantly, except the sucrose
concentration in the inflorescence. 'Susara' and 'Ivy' had very high initial carbohydrate
concentrations in the leaves which decreased significantly. The very high initial
carbohydrate concentrations in the inflorescence of 'Ivy' declined significantly. 'Brenda'
differed from the other cultivars and species in that glucose concentrations increased over
time. Carbohydrate concentrations of most of the tested proteas declined significantly
from harvest to the initiation of leaf blackening. This highlighted the dependence of the
leaves and inflorescence on the carbohydrate reserves, further substantiating the
carbohydrate depletion theory. The inflorescences were characterized by high fructose
and glucose concentrations and low sucrose concentrations when compared to the leaves. It was hypothesized that glucose pulsing and cold storage at 1°C for three weeks would
significantly reduce leaf blackening. 'Brenda', 'Cardinal', 'Carnival', 'Pink Ice',
'Susara ' and 'Sylvia' had significantly less leaf blackening with glucose treatments of 4
and 10%. Leaf blackening of 'Sheila', P. cynaroides and P. grandiceps was not
significantly reduced by glucose pulsing. P. magnifica showed a small, but significant,
reduction in leaf blackening in response to the 3, 6 and 9% treatments after 10 days only,
but despite this, leaf blackening was unacceptably high. 'Pink Ice' harvested at the soft
tip stage had less leaf blackening than those harvested open or closed. Toxicity
symptoms on the leaves, and in some instances flowers, were observed at higher glucose
concentrations (8 and 10%) onP. grandiceps, P. cynaroides, 'Cardinal' and 'Sheila'. All
glucose treatments resulted in toxicity symptoms on P. magnifica. A decrease in nonstructural
carbohydrates post-harvest apparently occurs in all proteas but it appears that
only members of the Ligulatae respond to glucose.
Glucose pulsing followed by cold storage at 1°C for three weeks in combination with
post-storage glucose vase solutions, significantly reduced leaf blackening of some Protea
cultivars. Glucose (1 and 2%), with hypochlorite, significantly delayed leaf blackening
in 'Cardinal' and 'Sylvia' after seven days. Leaf blackening of 'Brenda', 'Carnival',
'Pink Ice'…
Advisors/Committee Members: Jacobs, G., Holcroft, D. M., Stellenbosch University. Faculty of AgriSciences. Dept. of Horticultural Sciences..
Subjects/Keywords: Protea – Postharvest losses; Cut flowers – Postharvest losses; Carbohydrates; Protea – Postharvest physiology; Dissertations – Horticulture
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Meyer, C. (2003). Carbohydrates and leaf blackening of Protea cut flowers. (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/53320
Chicago Manual of Style (16th Edition):
Meyer, Celeste. “Carbohydrates and leaf blackening of Protea cut flowers.” 2003. Masters Thesis, Stellenbosch University. Accessed January 16, 2021.
http://hdl.handle.net/10019.1/53320.
MLA Handbook (7th Edition):
Meyer, Celeste. “Carbohydrates and leaf blackening of Protea cut flowers.” 2003. Web. 16 Jan 2021.
Vancouver:
Meyer C. Carbohydrates and leaf blackening of Protea cut flowers. [Internet] [Masters thesis]. Stellenbosch University; 2003. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10019.1/53320.
Council of Science Editors:
Meyer C. Carbohydrates and leaf blackening of Protea cut flowers. [Masters Thesis]. Stellenbosch University; 2003. Available from: http://hdl.handle.net/10019.1/53320
Stellenbosch University
27.
Herbst, Willem Jacobus.
Kinetic evaluation of lipopeptide production by Bacillus amyloliquefaciens.
Degree: MEng, Process Engineering, 2017, Stellenbosch University
URL: http://hdl.handle.net/10019.1/101012
► ENGLISH SUMMARY: Crop losses, caused by phytopathogens and pests, are estimated to be as high as 83% worldwide. These losses along with the world's growing…
(more)
▼ ENGLISH SUMMARY: Crop losses, caused by phytopathogens and pests, are estimated to be as high as 83% worldwide. These losses along with the world's growing population put additional strain on food production and security which emphasise the need for improved crop protection strategies.
Chemically derived pesticides and fungicides are the preferred control strategy against
postharvest diseases, however their detrimental effect on the environment and human life have directed research towards alternative strategies. Biocontrol have been identified as an alternative since they are environmentally safe, biodegradable and show antagonistic behaviour against fungi, bacteria and even viruses.
Bacillus spp. have been shown to be effective as they produce the lipopeptides surfactin, iturin and fengycin. Direct application of the organism as cells and spores have been well documented and is the focus of commercially developed products. However, cell free lipopeptides have achieved greater inhibition against phytopathogens and are less sensitive to environmental factors. The study optimised upstream production of antifungal lipopeptides, iturin and fengycin by Bacillus amyloliquefaciens in controlled batch cultures. The effect of nitrogen source, concentration and dissolved oxygen availability were quantified through rigorous kinetic
[NEXT THREE PARAGRAPHS DID NOT COPY. PLEASE REFER TO ORIGINAL DOCUMENT]
production (158.15 mAU*min/g/l), highest maximum productivity (26.92 mAU*min/h) and competitively high selectivity (86.7%).
A decrease in dissolved oxygen availability, decreased antifungal lipopeptide production kinetics. Low oxygen conditions forced nitrate to be used as an alternative electron acceptor, decreasing the amount of nitrate available for lipopeptide production.
Optimum conditions cultured in the bioreactor performed better with respect to antifungal kinetics (maximum concentration, specific production and productivity) except µmax and CDW compared to the optimum reported in a previous study (8 g/l NH4NO3). Maximum concentration increased from 285.66 to 290.17 mAU*min, specific antifungal production from 51.85 to 58.1 mAU*min/g/l and productivity from 5.67 to 22.32 mAU*min/h.
Culture supernatant, concentrated by acid precipitation, were used for antifungal efficacy tests. Fungal inhibition was observed against Botrytis cinerea, Alternaria brassicicola, Monilinia fructigena, Penicillium expansum and Rhizopus stolonifer while no inhibition was observed against Aspergillus sclerotiorum.
The high effectiveness of antifungal lipopeptides in combination with kinetic data from this study indicate the potential to develop a standardised antifungal product for use against phytopathogens affecting post-harvest fruit. The effect of the process parameters on homologue production and ratio should be investigated, which could allow antifungal products to be tailored to contain specific homologues effective against specific phytopathogens. The use of continuous cultures for further kinetic evaluation and…
Advisors/Committee Members: Clarke, Kim Gail, Stellenbosch University. Faculty of Engineering. Dept. of Process Engineering..
Subjects/Keywords: Lipopeptides; Crops – Postharvest losses – Prevention; Plants, Protection of; Antifungal agents – Kinetic evaluation; Postharvest diseases and injuries; Phytopathogenic bacteria; Bacillus amyloliquefaciens; UCTD
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Herbst, W. J. (2017). Kinetic evaluation of lipopeptide production by Bacillus amyloliquefaciens. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/101012
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Herbst, Willem Jacobus. “Kinetic evaluation of lipopeptide production by Bacillus amyloliquefaciens.” 2017. Thesis, Stellenbosch University. Accessed January 16, 2021.
http://hdl.handle.net/10019.1/101012.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Herbst, Willem Jacobus. “Kinetic evaluation of lipopeptide production by Bacillus amyloliquefaciens.” 2017. Web. 16 Jan 2021.
Vancouver:
Herbst WJ. Kinetic evaluation of lipopeptide production by Bacillus amyloliquefaciens. [Internet] [Thesis]. Stellenbosch University; 2017. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10019.1/101012.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Herbst WJ. Kinetic evaluation of lipopeptide production by Bacillus amyloliquefaciens. [Thesis]. Stellenbosch University; 2017. Available from: http://hdl.handle.net/10019.1/101012
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Stellenbosch University
28.
Kritzinger, Imke.
Postharvest moisture loss in Japanese plums.
Degree: PhD, Horticulture, 2019, Stellenbosch University
URL: http://hdl.handle.net/10019.1/105958
► ENGLISH ABSTRACT: Plums exported from South Africa reach overseas markets after a long sea freight period. Yet consumers still expect fruit to be in perfect…
(more)
▼ ENGLISH ABSTRACT: Plums exported from South Africa reach overseas markets after a long sea freight
period. Yet consumers still expect fruit to be in perfect condition upon arrival at the
supermarket. While care is taken to limit moisture loss throughout the handling chain,
fruit still show the negative effects thereof. Reduced fruit quality due to moisture loss
may lead to rejection of export consignments at overseas markets, causing major
financial losses for South African producers.
The aim of this study was to investigate the role of the fruit cuticle in determining
moisture loss and susceptibility to shrivel development in Japanese plum cultivars.
Peel permeability differed between farms, seasons, cultivars, orchards and
developmental stage. In general, the water vapour permeance of the peel was higher
in cultivars that are susceptible to moisture loss and shrivelling. However, this was not
true in all cases and measuring pre-harvest water vapour permeance of the peel to
predict shrivel susceptibility was only successful in some cultivars.
Lenticel numbers differed between seasons and cultivars and clearly contribute to
moisture loss, but this contribution differs between cultivars. As the number of open
lenticels could not explain all the variation in peel permeability between cultivars,
cuticle composition must play an important role in determining peel permeability.
Cuticular composition differed significantly between cultivars and seasons. The
compound 2,4-bis (dimethyl benzyl) phenol was present in high concentration in both
cultivars. We propose that the combination of a rigid cuticle, due to high phenol
content, fewer tri-hydroxy acids, and high primary alcohol content, and its smaller
intercellular spaces, reduces ‘Songold’ cuticle deformation due to excessive
postharvest moisture loss. Since the hypodermal cells of ‘Songold’ are closer together,
their dehydration and collapse might not lead to significant shrinkage compared to the
other cultivars. The cuticle is rigid, which means that it is less likely to collapse when
the supporting cells underneath it shrink and collapse due to moisture loss.
Packaging solutions to reduce moisture loss need to be optimized for individual
cultivars since they vary so much in terms of susceptibility to moisture loss and shrivel.
Using Low-Density Poly-Ethylene packaging with 92 or 72 micro-perforations might
be a viable option to reduce moisture loss, while still preventing excessive in-package
humidity, decay and chilling injury. In seasons when high rates of moisture loss are
experienced, the use of these bags might reduce the number of consignments rejected
at overseas markets.
This study showed the complex interplay of different cuticle characteristics in response
to or as a result of, moisture loss. It would be interesting to investigate how
environmental signals lead to a certain cuticular response – which genes are involved,
how these genes activated and so forth. Elucidating some of the mechanisms involved
in the functioning…
Advisors/Committee Members: Lotze, E., Theron, K. I., Stellenbosch University. Faculty of Agrisciences. Dept. of Horticulture..
Subjects/Keywords: Fruit – Storage – Diseases and injuries; Japanese plum cultivars – Moisture loss; Fruit – Postharvest physiology; Japanese plums – Postharvest handling; UCTD
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kritzinger, I. (2019). Postharvest moisture loss in Japanese plums. (Doctoral Dissertation). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/105958
Chicago Manual of Style (16th Edition):
Kritzinger, Imke. “Postharvest moisture loss in Japanese plums.” 2019. Doctoral Dissertation, Stellenbosch University. Accessed January 16, 2021.
http://hdl.handle.net/10019.1/105958.
MLA Handbook (7th Edition):
Kritzinger, Imke. “Postharvest moisture loss in Japanese plums.” 2019. Web. 16 Jan 2021.
Vancouver:
Kritzinger I. Postharvest moisture loss in Japanese plums. [Internet] [Doctoral dissertation]. Stellenbosch University; 2019. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10019.1/105958.
Council of Science Editors:
Kritzinger I. Postharvest moisture loss in Japanese plums. [Doctoral Dissertation]. Stellenbosch University; 2019. Available from: http://hdl.handle.net/10019.1/105958
University of Otago
29.
Kerr, Chelsea.
Postharvest storage of loose leaf lettuce (Lactuca sativa); the role of light, nutrients, bioactive levels and potential health benefits
.
Degree: University of Otago
URL: http://hdl.handle.net/10523/9213
► A diet rich in fresh fruit and vegetables is associated with a reduced incidence of disease, this health benefit is largely due to bioactive compounds.…
(more)
▼ A diet rich in fresh fruit and vegetables is associated with a reduced incidence of disease, this health benefit is largely due to bioactive compounds. Bioactive compounds are mostly secondary metabolites, many of which help to protect plants during times of stress. Most vegetables are stored in the dark
postharvest and this can induce senescence, which often results in a loss of bioactive compounds. By improving
postharvest storage techniques, the loss of bioactive compounds could be reduced. The aim of this study was to investigate how storage in the light, supplied by full spectrum light emitting diodes (LED’s), affected the
postharvest storage life and bioactive molecule content of loose leaf lettuce (Lactuca sativa). In addition, how storage of lettuce in the presence or absence of light influences the bioprotective capacity simulated human digests of lettuce leaves have on cultured Caco-2 cells was also investigated. Lettuce plants were stored in either constant darkness, a photoperiod (8 h light: 16 h dark), or in constant light. Plants stored in the photoperiod had a greater antioxidant capacity than plants stored in either constant darkness or constant light. Lettuce plants stored in constant light were shown to be under oxidative stress and this negatively influenced both measures of quality and human cell bioprotective capacity, compared to plants stored under a photoperiod. The results of this study highlight a simple technology that enables both more bioactive compounds and a greater human cell bioprotective capacity to be retained during
postharvest storage of lettuce. This could potentially be of benefit to human health.
Advisors/Committee Members: Burritt, David (advisor).
Subjects/Keywords: Postharvest;
Lettuce;
Bioactives;
postharvest light;
LED;
Caco-2
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kerr, C. (n.d.). Postharvest storage of loose leaf lettuce (Lactuca sativa); the role of light, nutrients, bioactive levels and potential health benefits
. (Masters Thesis). University of Otago. Retrieved from http://hdl.handle.net/10523/9213
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Chicago Manual of Style (16th Edition):
Kerr, Chelsea. “Postharvest storage of loose leaf lettuce (Lactuca sativa); the role of light, nutrients, bioactive levels and potential health benefits
.” Masters Thesis, University of Otago. Accessed January 16, 2021.
http://hdl.handle.net/10523/9213.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
MLA Handbook (7th Edition):
Kerr, Chelsea. “Postharvest storage of loose leaf lettuce (Lactuca sativa); the role of light, nutrients, bioactive levels and potential health benefits
.” Web. 16 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Vancouver:
Kerr C. Postharvest storage of loose leaf lettuce (Lactuca sativa); the role of light, nutrients, bioactive levels and potential health benefits
. [Internet] [Masters thesis]. University of Otago; [cited 2021 Jan 16].
Available from: http://hdl.handle.net/10523/9213.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Council of Science Editors:
Kerr C. Postharvest storage of loose leaf lettuce (Lactuca sativa); the role of light, nutrients, bioactive levels and potential health benefits
. [Masters Thesis]. University of Otago; Available from: http://hdl.handle.net/10523/9213
Note: this citation may be lacking information needed for this citation format:
No year of publication.
University of Adelaide
30.
Porter, Kerry Louise.
The postharvest physiology of Chinese cabbage cv. 'Yuki' / by Kerry Porter.
Degree: 2003, University of Adelaide
URL: http://hdl.handle.net/2440/22065
Subjects/Keywords: Chinese cabbage Postharvest physiology.; Chinese cabbage Postharvest technology
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Porter, K. L. (2003). The postharvest physiology of Chinese cabbage cv. 'Yuki' / by Kerry Porter. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/22065
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Porter, Kerry Louise. “The postharvest physiology of Chinese cabbage cv. 'Yuki' / by Kerry Porter.” 2003. Thesis, University of Adelaide. Accessed January 16, 2021.
http://hdl.handle.net/2440/22065.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Porter, Kerry Louise. “The postharvest physiology of Chinese cabbage cv. 'Yuki' / by Kerry Porter.” 2003. Web. 16 Jan 2021.
Vancouver:
Porter KL. The postharvest physiology of Chinese cabbage cv. 'Yuki' / by Kerry Porter. [Internet] [Thesis]. University of Adelaide; 2003. [cited 2021 Jan 16].
Available from: http://hdl.handle.net/2440/22065.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Porter KL. The postharvest physiology of Chinese cabbage cv. 'Yuki' / by Kerry Porter. [Thesis]. University of Adelaide; 2003. Available from: http://hdl.handle.net/2440/22065
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] [3] [4] [5] … [14] ▶
. 
Open Access Theses and Dissertations