subject:(Postharvest)

1. 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: MS, Food Science, 2013, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/sparks_sara_a_201305_ms

► 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)

Subjects/Keywords: postharvest

…33 Figure 3: Generalized Postharvest Handling System… …41 Figure 4: Postharvest Handling System for Pineapples… …44 Figure 5: Areas of Economic Concern in Postharvest Handling System… …46 Figure 6: Food Safety Concerns in Postharvest Handling System… …49 Figure 7: Overall Concerns in Postharvest Handling System…

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APA (6^th Edition):

Sparks, S. A. (2013). Postharvest handling systems for fresh fruits and vegetables in sub-Saharan Africa and potential enhancement by the Aid for Trade initiative. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/sparks_sara_a_201305_ms

Chicago Manual of Style (16^th 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.” 2013. Masters Thesis, University of Georgia. Accessed October 23, 2019. http://purl.galileo.usg.edu/uga_etd/sparks_sara_a_201305_ms.

MLA Handbook (7^th 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.” 2013. Web. 23 Oct 2019.

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] [Masters thesis]. University of Georgia; 2013. [cited 2019 Oct 23]. Available from: http://purl.galileo.usg.edu/uga_etd/sparks_sara_a_201305_ms.

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. [Masters Thesis]. University of Georgia; 2013. Available from: http://purl.galileo.usg.edu/uga_etd/sparks_sara_a_201305_ms

Massey University

2. 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

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APA (6^th 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 (16^th Edition):

Hashmi, Majid Suhail. “Hypobaric treatment : an innovative approach to control postharvest diseases of strawberries.” 2014. Doctoral Dissertation, Massey University. Accessed October 23, 2019. http://hdl.handle.net/10179/5638.

MLA Handbook (7^th Edition):

Hashmi, Majid Suhail. “Hypobaric treatment : an innovative approach to control postharvest diseases of strawberries.” 2014. Web. 23 Oct 2019.

Vancouver:

Hashmi MS. Hypobaric treatment : an innovative approach to control postharvest diseases of strawberries. [Internet] [Doctoral dissertation]. Massey University; 2014. [cited 2019 Oct 23]. 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

Massey University

3. 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

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APA (6^th 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 (16^th Edition):

Samarakoon, Himani Chamila. “Ethylene flux in postharvest kiwifruit systems.” 2013. Masters Thesis, Massey University. Accessed October 23, 2019. http://hdl.handle.net/10179/5189.

MLA Handbook (7^th Edition):

Samarakoon, Himani Chamila. “Ethylene flux in postharvest kiwifruit systems.” 2013. Web. 23 Oct 2019.

Vancouver:

Samarakoon HC. Ethylene flux in postharvest kiwifruit systems. [Internet] [Masters thesis]. Massey University; 2013. [cited 2019 Oct 23]. 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

Cornell University

4. Branstrom, Isabel Ane. POSTHARVEST COLD STORAGE AFFECTS FLOWER LIFE AND PHYSIOLOGY OF POTTED TULIPS .

Degree: 2018, Cornell University

URL: http://hdl.handle.net/1813/59487

► Postharvest cold storage is a common practice by potted tulip growers to respond to quality and timing demands. Plants are placed into cold storage at… (more)

Subjects/Keywords: postharvest; Plant sciences; Horticulture; Tulips

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APA (6^th Edition):

Branstrom, I. A. (2018). POSTHARVEST COLD STORAGE AFFECTS FLOWER LIFE AND PHYSIOLOGY OF POTTED TULIPS . (Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/59487

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Branstrom, Isabel Ane. “POSTHARVEST COLD STORAGE AFFECTS FLOWER LIFE AND PHYSIOLOGY OF POTTED TULIPS .” 2018. Thesis, Cornell University. Accessed October 23, 2019. http://hdl.handle.net/1813/59487.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Branstrom, Isabel Ane. “POSTHARVEST COLD STORAGE AFFECTS FLOWER LIFE AND PHYSIOLOGY OF POTTED TULIPS .” 2018. Web. 23 Oct 2019.

Vancouver:

Branstrom IA. POSTHARVEST COLD STORAGE AFFECTS FLOWER LIFE AND PHYSIOLOGY OF POTTED TULIPS . [Internet] [Thesis]. Cornell University; 2018. [cited 2019 Oct 23]. Available from: http://hdl.handle.net/1813/59487.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Branstrom IA. POSTHARVEST COLD STORAGE AFFECTS FLOWER LIFE AND PHYSIOLOGY OF POTTED TULIPS . [Thesis]. Cornell University; 2018. Available from: http://hdl.handle.net/1813/59487

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Guelph

5. Flemming, Carly. Investigating the effect of postharvest parameters on 'Redhaven' peaches .

Degree: 2017, University of Guelph

URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11522

► The objective of this study was to investigate the effect that postharvest parameters, including, harvest maturity and pre-cooling treatments, have on the sensory and physicochemical… (more)

Subjects/Keywords: Postharvest; Sensory evaluation; Peaches

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APA (6^th Edition):

Flemming, C. (2017). Investigating the effect of postharvest parameters on 'Redhaven' peaches . (Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11522

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Flemming, Carly. “Investigating the effect of postharvest parameters on 'Redhaven' peaches .” 2017. Thesis, University of Guelph. Accessed October 23, 2019. https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11522.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Flemming, Carly. “Investigating the effect of postharvest parameters on 'Redhaven' peaches .” 2017. Web. 23 Oct 2019.

Vancouver:

Flemming C. Investigating the effect of postharvest parameters on 'Redhaven' peaches . [Internet] [Thesis]. University of Guelph; 2017. [cited 2019 Oct 23]. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11522.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Flemming C. Investigating the effect of postharvest parameters on 'Redhaven' peaches . [Thesis]. University of Guelph; 2017. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11522

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: 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)

Subjects/Keywords: Phospholipase D; Hexanal; Postharvest; Strawberry

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APA (6^th Edition):

Brandt, R. (2019). Effect of Hexanal Formulations on the Postharvest Quality and Gene Expression of Strawberry (Fragaria x ananassa Duch.). (Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14761

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Brandt, Robert. “Effect of Hexanal Formulations on the Postharvest Quality and Gene Expression of Strawberry (Fragaria x ananassa Duch.). ” 2019. Thesis, University of Guelph. Accessed October 23, 2019. https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14761.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Brandt, Robert. “Effect of Hexanal Formulations on the Postharvest Quality and Gene Expression of Strawberry (Fragaria x ananassa Duch.). ” 2019. Web. 23 Oct 2019.

Vancouver:

Brandt R. Effect of Hexanal Formulations on the Postharvest Quality and Gene Expression of Strawberry (Fragaria x ananassa Duch.). [Internet] [Thesis]. University of Guelph; 2019. [cited 2019 Oct 23]. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14761.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Brandt R. Effect of Hexanal Formulations on the Postharvest Quality and Gene Expression of Strawberry (Fragaria x ananassa Duch.). [Thesis]. University of Guelph; 2019. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/14761

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Massey University

7. Doleh, Leila. Curing kiwifruit : physical, physiological and storage impacts.

Degree: Master of Food Science and 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)

Subjects/Keywords: Kiwifruit – Postharvest losses – Prevention; Kiwifruit – Postharvest physiology; Kiwifruit – Storage

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APA (6^th 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 (16^th Edition):

Doleh, Leila. “Curing kiwifruit : physical, physiological and storage impacts.” 2018. Masters Thesis, Massey University. Accessed October 23, 2019. http://hdl.handle.net/10179/14696.

MLA Handbook (7^th Edition):

Doleh, Leila. “Curing kiwifruit : physical, physiological and storage impacts.” 2018. Web. 23 Oct 2019.

Vancouver:

Doleh L. Curing kiwifruit : physical, physiological and storage impacts. [Internet] [Masters thesis]. Massey University; 2018. [cited 2019 Oct 23]. 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

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

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APA (6^th 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 (16^th Edition):

Liu, John. “The Plant Circadian Clock: Roles in Jasmonate Accumulation and Postharvest Plant Performance.” 2015. Doctoral Dissertation, Rice University. Accessed October 23, 2019. http://hdl.handle.net/1911/88094.

MLA Handbook (7^th Edition):

Liu, John. “The Plant Circadian Clock: Roles in Jasmonate Accumulation and Postharvest Plant Performance.” 2015. Web. 23 Oct 2019.

Vancouver:

Liu J. The Plant Circadian Clock: Roles in Jasmonate Accumulation and Postharvest Plant Performance. [Internet] [Doctoral dissertation]. Rice University; 2015. [cited 2019 Oct 23]. 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

Sardar Patel University

9. 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

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APA (6^th 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 (16^th Edition):

Gol, Neeta B. “Postharvest quality maintenance and shelf life extension of some commercially important perishable horticultural commodities;.” 2013. Thesis, Sardar Patel University. Accessed October 23, 2019. 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 (7^th Edition):

Gol, Neeta B. “Postharvest quality maintenance and shelf life extension of some commercially important perishable horticultural commodities;.” 2013. Web. 23 Oct 2019.

Vancouver:

Gol NB. Postharvest quality maintenance and shelf life extension of some commercially important perishable horticultural commodities;. [Internet] [Thesis]. Sardar Patel University; 2013. [cited 2019 Oct 23]. 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

University of Pretoria

10. 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

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APA (6^th 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 (16^th 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 October 23, 2019. http://hdl.handle.net/2263/28370.

MLA Handbook (7^th Edition):

Havenga, Wilma. “Mode of action of Bacillus subtilis ATCC 55466 as biocontrol agent of postharvest diseases of avocados.” 2011. Web. 23 Oct 2019.

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 2019 Oct 23]. 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 Pretoria

11. [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

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APA (6^th 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 (16^th 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 October 23, 2019. http://upetd.up.ac.za/thesis/available/etd-02132006-082309/.

MLA Handbook (7^th Edition):

author], [No. “Mode of action of Bacillus subtilis ATCC 55466 as biocontrol agent of postharvest diseases of avocados .” 2011. Web. 23 Oct 2019.

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 2019 Oct 23]. 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

12. 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

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APA (6^th 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 (16^th 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 October 23, 2019. http://hdl.handle.net/10523/4127.

MLA Handbook (7^th 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. 23 Oct 2019.

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 2019 Oct 23]. 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

13. 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

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APA (6^th 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 (16^th 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 October 23, 2019. http://hdl.handle.net/1957/40440.

MLA Handbook (7^th 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. 23 Oct 2019.

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 2019 Oct 23]. 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

University of Hawaii – Manoa

14. Manenoi, Ashariya. Papaya fruit xylanase : translation and activity during fruit softening.

Degree: PhD, 2009, University of Hawaii – Manoa

URL: http://hdl.handle.net/10125/11672

Also available by subscription via World Wide Web

xv, 148 leaves, bound col. ill., col. charts 29 cm

Subjects/Keywords: Papaya – Ripening; Papaya – Postharvest physiology; Xylanases

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APA (6^th Edition):

Manenoi, A. (2009). Papaya fruit xylanase : translation and activity during fruit softening. (Doctoral Dissertation). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/11672

Chicago Manual of Style (16^th Edition):

Manenoi, Ashariya. “Papaya fruit xylanase : translation and activity during fruit softening.” 2009. Doctoral Dissertation, University of Hawaii – Manoa. Accessed October 23, 2019. http://hdl.handle.net/10125/11672.

MLA Handbook (7^th Edition):

Manenoi, Ashariya. “Papaya fruit xylanase : translation and activity during fruit softening.” 2009. Web. 23 Oct 2019.

Vancouver:

Manenoi A. Papaya fruit xylanase : translation and activity during fruit softening. [Internet] [Doctoral dissertation]. University of Hawaii – Manoa; 2009. [cited 2019 Oct 23]. Available from: http://hdl.handle.net/10125/11672.

Council of Science Editors:

Manenoi A. Papaya fruit xylanase : translation and activity during fruit softening. [Doctoral Dissertation]. University of Hawaii – Manoa; 2009. Available from: http://hdl.handle.net/10125/11672

Clemson University

15. 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

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APA (6^th 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 (16^th 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 October 23, 2019. https://tigerprints.clemson.edu/all_dissertations/792.

MLA Handbook (7^th Edition):

Enfield, Amy. “INFLUENCE OF THE POSTHARVEST ENVIRONMENT ON THE STORAGE POTENTIAL AND PROPAGATION PERFORMANCE OF UNROOTED CUTTINGS OF HERBACEOUS ORNAMENTALS.” 2011. Web. 23 Oct 2019.

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 2019 Oct 23]. 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

16. 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

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APA (6^th 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 (16^th Edition):

Barchenger, Derek. “Postharvest Storage and Nutraceutical Evaluation of Muscadine Grapes (Vitis rotundifolia Michx.).” 2014. Masters Thesis, University of Arkansas. Accessed October 23, 2019. https://scholarworks.uark.edu/etd/2364.

MLA Handbook (7^th Edition):

Barchenger, Derek. “Postharvest Storage and Nutraceutical Evaluation of Muscadine Grapes (Vitis rotundifolia Michx.).” 2014. Web. 23 Oct 2019.

Vancouver:

Barchenger D. Postharvest Storage and Nutraceutical Evaluation of Muscadine Grapes (Vitis rotundifolia Michx.). [Internet] [Masters thesis]. University of Arkansas; 2014. [cited 2019 Oct 23]. 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

Cornell University

17. Doerflinger, Franziska. Starch Metabolism In Apple Fruit And Its Relationship With Maturation And Ripening .

Degree: 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: Cheng,Lailiang (committeeMember), Rickard,Bradley J. (committeeMember).

Subjects/Keywords: apple (Malus domestica); starch; postharvest physiology

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APA (6^th Edition):

Doerflinger, F. (2015). Starch Metabolism In Apple Fruit And Its Relationship With Maturation And Ripening . (Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/40631

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Doerflinger, Franziska. “Starch Metabolism In Apple Fruit And Its Relationship With Maturation And Ripening .” 2015. Thesis, Cornell University. Accessed October 23, 2019. http://hdl.handle.net/1813/40631.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Doerflinger, Franziska. “Starch Metabolism In Apple Fruit And Its Relationship With Maturation And Ripening .” 2015. Web. 23 Oct 2019.

Vancouver:

Doerflinger F. Starch Metabolism In Apple Fruit And Its Relationship With Maturation And Ripening . [Internet] [Thesis]. Cornell University; 2015. [cited 2019 Oct 23]. Available from: http://hdl.handle.net/1813/40631.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Doerflinger F. Starch Metabolism In Apple Fruit And Its Relationship With Maturation And Ripening . [Thesis]. Cornell University; 2015. Available from: http://hdl.handle.net/1813/40631

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Stellenbosch University

18. 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

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APA (6^th 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 (16^th Edition):

Arendse, Ebrahiema. “Determining optimum storage conditions for pomegranate fruit (cv. Wonderful).” 2014. Masters Thesis, Stellenbosch University. Accessed October 23, 2019. http://hdl.handle.net/10019.1/86523.

MLA Handbook (7^th Edition):

Arendse, Ebrahiema. “Determining optimum storage conditions for pomegranate fruit (cv. Wonderful).” 2014. Web. 23 Oct 2019.

Vancouver:

Arendse E. Determining optimum storage conditions for pomegranate fruit (cv. Wonderful). [Internet] [Masters thesis]. Stellenbosch University; 2014. [cited 2019 Oct 23]. 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 South Africa

19. 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)

Subjects/Keywords: Cutflowers; Gerbera jamesonii; Postharvest; Preservatives; Stem bending

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APA (6^th 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 (16^th 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 October 23, 2019. http://hdl.handle.net/10500/23269.

MLA Handbook (7^th Edition):

Maluleke, Mdungazi Knox. “Determination of the optimal preservatives for preventing stem bending of Gebera jamesonii "Black Diamond".” 2016. Web. 23 Oct 2019.

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 2019 Oct 23]. 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

University of Johannesburg

20. 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.

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APA (6^th 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 (16^th 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 October 23, 2019. 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 (7^th Edition):

Mhlophe, Sibongile Dorothy. “Use of 1-methylcyclopropene, modified atmosphere and imazalil to extend the storage life of 'Santa' tomatoes.” 2012. Web. 23 Oct 2019.

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 2019 Oct 23]. 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 Guelph

21. Ige, Oderonke Dorothy. Comparison of the quality aspects of organic and conventional green beans (Phaseolus vulgaris L.) .

Degree: 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)

Subjects/Keywords: Green beans; Quality; Antioxidant; Organic; Conventional; Postharvest

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APA (6^th Edition):

Ige, O. D. (2012). Comparison of the quality aspects of organic and conventional green beans (Phaseolus vulgaris L.) . (Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3505

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ige, Oderonke Dorothy. “Comparison of the quality aspects of organic and conventional green beans (Phaseolus vulgaris L.) .” 2012. Thesis, University of Guelph. Accessed October 23, 2019. https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3505.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ige, Oderonke Dorothy. “Comparison of the quality aspects of organic and conventional green beans (Phaseolus vulgaris L.) .” 2012. Web. 23 Oct 2019.

Vancouver:

Ige OD. Comparison of the quality aspects of organic and conventional green beans (Phaseolus vulgaris L.) . [Internet] [Thesis]. University of Guelph; 2012. [cited 2019 Oct 23]. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3505.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ige OD. Comparison of the quality aspects of organic and conventional green beans (Phaseolus vulgaris L.) . [Thesis]. University of Guelph; 2012. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3505

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Kansas State University

22. 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

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APA (6^th 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 (16^th Edition):

McDaniel, Austin. “Effective pack practices to control postharvest diseases in small berries.” 2019. Masters Thesis, Kansas State University. Accessed October 23, 2019. http://hdl.handle.net/2097/40073.

MLA Handbook (7^th Edition):

McDaniel, Austin. “Effective pack practices to control postharvest diseases in small berries.” 2019. Web. 23 Oct 2019.

Vancouver:

McDaniel A. Effective pack practices to control postharvest diseases in small berries. [Internet] [Masters thesis]. Kansas State University; 2019. [cited 2019 Oct 23]. 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 KwaZulu-Natal

23. [No author]. Biochemical and microbiological changes in sugarcane stalks during a simulated harvest-to-crush delay.

Degree: Biochemistry, 2008, University of KwaZulu-Natal

URL: http://hdl.handle.net/10413/10843

► Post-harvest cane deterioration in the South African sugar industry results in significant revenue loss that is estimated to be in the region of ZAR 60… (more)

▼ Post-harvest cane deterioration in the South African sugar industry results in significant revenue loss that is estimated to be in the region of ZAR 60 million per annum. Despite these large losses, precise biological data relating to the process of cane deterioration under South African conditions is limited. Severity of deterioration is influenced by a number of factors, including the length of the harvest-to-crush delay (HTCD), ambient temperature and harvesting practices. For example, burning of cane prior to harvest may result in rind splitting, which provides entry for microbes, particularly Leuconostoc mesenteroides that may exacerbate deterioration. The effect of these factors on deterioration was examined by quantifying the biochemical and microbiological changes that occur in sugarcane stalks after harvest, with the influence of length of HTCD, degree of L. mesenteroides infection and ambient temperature receiving attention. The primary novelty of the work resides in the analysis of deterioration under tightly regulated temperatures, which were designed to reflect diurnal variations typically experienced during summer and winter in the South African sugar belt. In addition, inoculation of mature internodes with a consistent titre of L. mesenteroides was used as a means to mimic a consistent level of infection of harvested stalks by the bacterium. Metabolites selected for analysis were those both native to the stalk and produced as by-products of microbial metabolism, viz. sucrose, glucose, fructose, ethanol, lactic acid, dextran and mannitol. Simulated HTCDs under summer temperatures resulted in increasing glucose and fructose levels with time, which contrasted to the approximately constant levels of these hexose sugars under winter conditions. Commonly referred to as ‘purity’ in an industrial context, precise determination of the concentration of these hexoses in cane consignments could potentially indicate the extent of deterioration. Despite the detection of a basal concentration of lactic acid in unspoiled cane, the observed increase in concentration of this organic acid over the simulated summer HTCD suggests that this metabolite could also potentially serve as an indicator for postharvest deterioration. In contrast, the investigation indicated that ethanol was an unsuitable biochemical marker for deterioration of L. mesenteroides infected cane. An inability to detect dextran and mannitol in the samples, combined with consistent sucrose levels and variable mill room data, suggest that extreme proliferation of L. mesenteroides is facilitated primarily by in-field practices, particularly the manner in which cane is prepared prior to harvest and transport to the mill. Bacterial proliferation and infection by L. mesenteroides of inoculated stalks were monitored by standard selective culturing techniques. Despite the limited detection of L. mesenteroides-associated metabolites, culture-based analyses revealed that the bacterium was the dominant bacterial species within the… Advisors/Committee Members: Hunter, Charles (advisor), Watt, Derek (advisor).

Subjects/Keywords: Sugarcane – Postharvest physiology – South Africa.; Sugarcane – Postharvest losses – South Africa.; Temperature.; Leuconostoc – South Africa.; Biochemistry.

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APA (6^th Edition):

author], [. (2008). Biochemical and microbiological changes in sugarcane stalks during a simulated harvest-to-crush delay. (Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/10843

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

author], [No. “Biochemical and microbiological changes in sugarcane stalks during a simulated harvest-to-crush delay. ” 2008. Thesis, University of KwaZulu-Natal. Accessed October 23, 2019. http://hdl.handle.net/10413/10843.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

author], [No. “Biochemical and microbiological changes in sugarcane stalks during a simulated harvest-to-crush delay. ” 2008. Web. 23 Oct 2019.

Vancouver:

author] [. Biochemical and microbiological changes in sugarcane stalks during a simulated harvest-to-crush delay. [Internet] [Thesis]. University of KwaZulu-Natal; 2008. [cited 2019 Oct 23]. Available from: http://hdl.handle.net/10413/10843.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

author] [. Biochemical and microbiological changes in sugarcane stalks during a simulated harvest-to-crush delay. [Thesis]. University of KwaZulu-Natal; 2008. Available from: http://hdl.handle.net/10413/10843

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

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APA (6^th 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 (16^th Edition):

Li, Mo. “Developing non-destructive techniques to predict 'Hayward' kiwifruit storability.” 2017. Doctoral Dissertation, Massey University. Accessed October 23, 2019. http://hdl.handle.net/10179/13147.

MLA Handbook (7^th Edition):

Li, Mo. “Developing non-destructive techniques to predict 'Hayward' kiwifruit storability.” 2017. Web. 23 Oct 2019.

Vancouver:

Li M. Developing non-destructive techniques to predict 'Hayward' kiwifruit storability. [Internet] [Doctoral dissertation]. Massey University; 2017. [cited 2019 Oct 23]. 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. 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

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APA (6^th 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 (16^th Edition):

Meyer, Celeste. “Carbohydrates and leaf blackening of Protea cut flowers.” 2003. Masters Thesis, Stellenbosch University. Accessed October 23, 2019. http://hdl.handle.net/10019.1/53320.

MLA Handbook (7^th Edition):

Meyer, Celeste. “Carbohydrates and leaf blackening of Protea cut flowers.” 2003. Web. 23 Oct 2019.

Vancouver:

Meyer C. Carbohydrates and leaf blackening of Protea cut flowers. [Internet] [Masters thesis]. Stellenbosch University; 2003. [cited 2019 Oct 23]. 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

University of Helsinki

26. Kai Cheong, Ng. Efficient and Reliable Evaluation of Strawberry Grey Mould Resistance by Inoculation and The Strawberry Endophyte Content after Pseudomonas Fluorescens Application.

Degree: Department of Agricultural Sciences; Helsingfors universitet, Agrikultur- och forstvetenskapliga fakulteten, Institutionen för lantsbruksvetenskaper, 2016, University of Helsinki

URL: http://hdl.handle.net/10138/166924

► Garden strawberry (Fragaria x ananassa Duch.) is one of the most important soft fruit crops in Finland. Every year, over ten thousand tonnes of strawberries… (more)

Subjects/Keywords: Biocontrol; Botrytis Rot; Breeding; Phenotype Evaluation; Postharvest; Endophyte; Växtproduktionsvetenskap; Plant Production Science; Kasvintuotantotieteet; Biocontrol; Botrytis Rot; Breeding; Phenotype Evaluation; Postharvest; Endophyte

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APA (6^th Edition):

Kai Cheong, N. (2016). Efficient and Reliable Evaluation of Strawberry Grey Mould Resistance by Inoculation and The Strawberry Endophyte Content after Pseudomonas Fluorescens Application. (Masters Thesis). University of Helsinki. Retrieved from http://hdl.handle.net/10138/166924

Chicago Manual of Style (16^th Edition):

Kai Cheong, Ng. “Efficient and Reliable Evaluation of Strawberry Grey Mould Resistance by Inoculation and The Strawberry Endophyte Content after Pseudomonas Fluorescens Application.” 2016. Masters Thesis, University of Helsinki. Accessed October 23, 2019. http://hdl.handle.net/10138/166924.

MLA Handbook (7^th Edition):

Kai Cheong, Ng. “Efficient and Reliable Evaluation of Strawberry Grey Mould Resistance by Inoculation and The Strawberry Endophyte Content after Pseudomonas Fluorescens Application.” 2016. Web. 23 Oct 2019.

Vancouver:

Kai Cheong N. Efficient and Reliable Evaluation of Strawberry Grey Mould Resistance by Inoculation and The Strawberry Endophyte Content after Pseudomonas Fluorescens Application. [Internet] [Masters thesis]. University of Helsinki; 2016. [cited 2019 Oct 23]. Available from: http://hdl.handle.net/10138/166924.

Council of Science Editors:

Kai Cheong N. Efficient and Reliable Evaluation of Strawberry Grey Mould Resistance by Inoculation and The Strawberry Endophyte Content after Pseudomonas Fluorescens Application. [Masters Thesis]. University of Helsinki; 2016. Available from: http://hdl.handle.net/10138/166924

Massey University

27. Cheng, Qingmin. Effects of temperature and coating treatment on gas exchange of 'Braeburn' apples.

Degree: Master of Applied Science, 1999, Massey University

URL: http://hdl.handle.net/10179/10579

► Achieving modified atmosphere (MA) effects on fruit through the use of surface coatings relies upon a suitable degree of internal atmosphere modification, which is strongly… (more)

▼ Achieving modified atmosphere (MA) effects on fruit through the use of surface coatings relies upon a suitable degree of internal atmosphere modification, which is strongly dependent upon both respiration rate and skin permeance to gases. In this study, skin porosity, skin permeance, internal partial pressures of oxygen and carbon dioxide, and respiration rate were measured at 0°C, 10°C, 20°C and 30°C in non-coated 'Braeburn' apples. Variation in respiration rate, internal partial pressures of oxygen and carbon dioxide, skin permeance to oxygen and carbon dioxide, and the extent to which all of these gas exchange characteristics affected by temperatures of 0°C, 5°C, 10°C, 15°C, 20°C were characterised in both non-coated and coated 'Braebum' apples. Coating treatments were 0, 0.2, 0.4, 0.6, 0.8 and 1.0 times either a 2% (w/w) solution of hydroxypropylcellulose (HPC) in distilled water, or a commercial formulation of carnauba wax and shellac coating, achieved by mixing the full strength solutions with distilled water. There was a 6- or 10-fold difference in respiration rate between fruit kept at 0°C and 20°C, or 0°C and 30°C, whilst the relative permeance to both O 2 and CO 2 differed only a factor of 1.7 or 1.5 in non-coated fruit. The differing effects of temperature upon these two variables were responsible for the depression of internal O 2 and elevation of internal CO 2 associated with increase in temperature from 0°C to 20°C or 30°C. There was no evidence that porosity was dependent on temperature, suggesting that the increasing permeance with higher temperatures may have resulted from increasing permeance of the cuticle. The modification of internal atmosphere composition in carnauba-coated fruit depended upon coating concentration and temperature. The effects of HPC coating on internal atmosphere, especially on internal CO 2 were less marked than those of temperature. In non-coated fruit, the magnitude of decline in internal O 2 was slightly greater than the increase in internal CO 2 over the temperature range in the experiment. For apples that were respiring aerobically, this indicates that the fruit skin had a slightly higher permeance to CO 2 than to O 2 . Since O 2 diffuses through pores were readily than CO 2 , gas exchange of these fruit appeared not to be pore dominated. The suppression of gas exchange by shellac coating was consistent with the coating blocking pores on the fruit surface to an extent that depended on coating concentration. The less pronounced effects of HPC coating in both skin permeance and internal gases were consistent with a coating that loosely covered the fruit surface rather than blocking the pores. Low concentrations of shellac coating achieved low internal O 2 levels at higher temperatures but had only slight effects on internal atmosphere composition at low temperatures. Higher concentrations that achieved MA benefit at low temperatures resulted in fermentation at higher temperatures. Given the natural variability in skin permeance, and the…

Subjects/Keywords: Apples; Postharvest technology; Postharvest physiology; Effect of temperature on

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cheng, Q. (1999). Effects of temperature and coating treatment on gas exchange of 'Braeburn' apples. (Masters Thesis). Massey University. Retrieved from http://hdl.handle.net/10179/10579

Chicago Manual of Style (16^th Edition):

Cheng, Qingmin. “Effects of temperature and coating treatment on gas exchange of 'Braeburn' apples.” 1999. Masters Thesis, Massey University. Accessed October 23, 2019. http://hdl.handle.net/10179/10579.

MLA Handbook (7^th Edition):

Cheng, Qingmin. “Effects of temperature and coating treatment on gas exchange of 'Braeburn' apples.” 1999. Web. 23 Oct 2019.

Vancouver:

Cheng Q. Effects of temperature and coating treatment on gas exchange of 'Braeburn' apples. [Internet] [Masters thesis]. Massey University; 1999. [cited 2019 Oct 23]. Available from: http://hdl.handle.net/10179/10579.

Council of Science Editors:

Cheng Q. Effects of temperature and coating treatment on gas exchange of 'Braeburn' apples. [Masters Thesis]. Massey University; 1999. Available from: http://hdl.handle.net/10179/10579

Massey University

28. Al-Harthy, Abdul-Aziz Salim. Postharvest treatments to extend the storage life of feijoa (Acca sellowiana).

Degree: PhD, Food Technology, 2010, Massey University

URL: http://hdl.handle.net/10179/2064

► Feijoas (Acca sellowiana) have a short harvest season and a limited postharvest life. In feijoa, usually there is a large variation between individual fruit in… (more)

▼ Feijoas (Acca sellowiana) have a short harvest season and a limited postharvest life. In feijoa, usually there is a large variation between individual fruit in terms of size, colour, chemical composition and physiological stage. This variation could be attributed to the time of fruit set which is relatively long, which leads to great variation in fruit maturity. In order for the New Zealand feijoa industry to export to distant markets a postharvest life of at least 6 weeks is required. Determining the maturity index of a crop is vital especially for trade regulations and marketing strategy. Feijoa do not change colour significantly during ripening, so the only unequivocal way of assessing fruit maturity is to cut the fruit open. An internal maturity rating scale has been developed by Plant and Food Research primarily based on locular development. The use of ‘touch picking’ depending on fruit retention force is considered the most practical and reliable method for the time being for determining minimum harvest maturity of feijoa. The aims of this work were to investigate options for a non-destructive method in determining maturity index of feijoa fruit compared to the internal maturity rating scale; extending storage life of feijoa fruit by cool storage and controlled atmosphere conditions to allow long distance sea freight to increase export opportunities; and to develop an understanding of feijoa ripening physiology in relation to ethylene and propylene treatments. In this study, differences between the commercial pack houses in identifying the optimum fruit maturity of feijoa at harvest were large. Compression firmness was more reliable than acoustic firmness in determining maturity stages of different feijoa cultivars, but acoustic firmness was quite reliable for some cultivars. The Sinclair unit device was not suitable for measuring maturity index of feijoa fruit tested. Spin-spin relaxation time (T2) and half height peak (ΔH2) determined by NMR showed promise for identifying fruit maturity. In general, these non-destructive techniques used in this experiment showed some promise but further work is required to understand why the differences between cultivars and regions happen. Chemical changes such as total soluble solids, dry matter and titratable acidity were found unhelpful in determining maturity stages of feijoa fruits. There was no significant reduction in TSS or dry matter with maturity, but there was a clear reduction in titratable acidity. Even with this clear trend with titratable acidity, it is not helpful as it is still a destructive measurement, nevertheless the internal chemical changes may be able to be estimated with a non-destructive technique such as Near Infrared Spectroscopy (NIRS). A combination of non-destructive methods such as firmness with NIR may be better than depending on a single index in identifying fruit maturity. In addition, the data clearly demonstrated that fruit at any particular internal maturity rating were clearly shown to have a wide range of firmness values, total…

Subjects/Keywords: Feijoa; Acca sellowiana; Postharvest treatment; Cool storage; Food technology; Fruit maturity identification; Controlled atmosphere storage; Postharvest loss of quality

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APA (6^th Edition):

Al-Harthy, A. S. (2010). Postharvest treatments to extend the storage life of feijoa (Acca sellowiana). (Doctoral Dissertation). Massey University. Retrieved from http://hdl.handle.net/10179/2064

Chicago Manual of Style (16^th Edition):

Al-Harthy, Abdul-Aziz Salim. “Postharvest treatments to extend the storage life of feijoa (Acca sellowiana).” 2010. Doctoral Dissertation, Massey University. Accessed October 23, 2019. http://hdl.handle.net/10179/2064.

MLA Handbook (7^th Edition):

Al-Harthy, Abdul-Aziz Salim. “Postharvest treatments to extend the storage life of feijoa (Acca sellowiana).” 2010. Web. 23 Oct 2019.

Vancouver:

Al-Harthy AS. Postharvest treatments to extend the storage life of feijoa (Acca sellowiana). [Internet] [Doctoral dissertation]. Massey University; 2010. [cited 2019 Oct 23]. Available from: http://hdl.handle.net/10179/2064.

Council of Science Editors:

Al-Harthy AS. Postharvest treatments to extend the storage life of feijoa (Acca sellowiana). [Doctoral Dissertation]. Massey University; 2010. Available from: http://hdl.handle.net/10179/2064

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)

Subjects/Keywords: Postharvest; Lettuce; Bioactives; postharvest light; LED; Caco-2

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APA (6^th 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 (16^th 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 October 23, 2019. http://hdl.handle.net/10523/9213.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

MLA Handbook (7^th Edition):

Kerr, Chelsea. “Postharvest storage of loose leaf lettuce (Lactuca sativa); the role of light, nutrients, bioactive levels and potential health benefits .” Web. 23 Oct 2019.

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 2019 Oct 23]. 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.

Stellenbosch University

30. 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

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th Edition):

Kritzinger, Imke. “Postharvest moisture loss in Japanese plums.” 2019. Doctoral Dissertation, Stellenbosch University. Accessed October 23, 2019. http://hdl.handle.net/10019.1/105958.

MLA Handbook (7^th Edition):

Kritzinger, Imke. “Postharvest moisture loss in Japanese plums.” 2019. Web. 23 Oct 2019.

Vancouver:

Kritzinger I. Postharvest moisture loss in Japanese plums. [Internet] [Doctoral dissertation]. Stellenbosch University; 2019. [cited 2019 Oct 23]. 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

Open Access Theses and Dissertations