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You searched for +publisher:"Rutgers University" +contributor:("Oudemans, Peter V."). Showing records 1 – 2 of 2 total matches.

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Rutgers University

1. Beirn, Lisa A., 1985-. Molecular insights into the microbial community of annual bluegrass (poa annua l.) putting green turf.

Degree: PhD, Planning and Public Policy, 2016, Rutgers University

Annual bluegrass (Poa annua; ABG) putting green turf is a unique man-made environment that requires regular fertility inputs to maintain acceptable turfgrass quality and playability. While these inputs can affect foliar diseases such as anthracnose, caused by Colletotrichum cereale, little is known about their impact on microbial communities in this ecosystem. The objectives of this dissertation were to: 1) determine the frequency and distribution of C. cereale in the United States, 2) examine the resident microbial communities in the soil of ABG putting green turf over time using advanced molecular technologies, and 3) identify how nitrogen (N) and/or potassium (K) fertilization affects the distribution, diversity, and abundance of benign and pathogenic microorganisms in this system. More than 50 phyla, representing hundreds of species of archaea, bacteria, and fungi were identified. Above ground, this diversity was highlighted in the form of two distinct lineages of C. cereale, both able to cause anthracnose disease but exhibiting distinct host and geographic preferences. Below ground, the ABG rhizosphere supported a vast microbial community, despite high sand content and regular fertilization and pesticide applications. Few turfgrass pathogens were identified from the soil. However, tremendous variation was characterized within the nonpathogenic microbial community, with the rhizosphere of ABG hosting organisms capable of antibiotic production, fixing nitrogen, or serving as potential biocontrol agents or mycorrhizal partners. Over all, individual microbial groups were present in low abundance across all samples. Fertilization did not affect microbial diversity, but did alter the abundance of specific microbial groups. Changes associated with fertility treatments were limited to approximately 7% of the total archaea/bacteria and 23% of the total fungal community identified. In general, K and low rates of N increased abundance of archaea, bacteria, and fungi in the study sites. Seasonality also strongly influenced microbial communities, with samples collected in summer months clustering separately from those obtained in the spring. The research described here provides the first insight into the diverse microbial community residing in the soil of ABG putting green turf utilizing next-generation sequence-based analyses, and protocols developed to conduct this work should help facilitate future research examining the turfgrass microbiome.

Advisors/Committee Members: Clarke, Bruce B (chair), Crouch, Jo Anne (internal member), Bonos, Stacy (internal member), Oudemans, Peter V (internal member), DaCosta, Michelle (outside member).

Subjects/Keywords: Annual bluegrass; Plant-microbe relationships; Agricultural microbiology

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

APA (6th Edition):

Beirn, Lisa A., 1. (2016). Molecular insights into the microbial community of annual bluegrass (poa annua l.) putting green turf. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/49146/

Chicago Manual of Style (16th Edition):

Beirn, Lisa A., 1985-. “Molecular insights into the microbial community of annual bluegrass (poa annua l.) putting green turf.” 2016. Doctoral Dissertation, Rutgers University. Accessed January 15, 2021. https://rucore.libraries.rutgers.edu/rutgers-lib/49146/.

MLA Handbook (7th Edition):

Beirn, Lisa A., 1985-. “Molecular insights into the microbial community of annual bluegrass (poa annua l.) putting green turf.” 2016. Web. 15 Jan 2021.

Vancouver:

Beirn, Lisa A. 1. Molecular insights into the microbial community of annual bluegrass (poa annua l.) putting green turf. [Internet] [Doctoral dissertation]. Rutgers University; 2016. [cited 2021 Jan 15]. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/49146/.

Council of Science Editors:

Beirn, Lisa A. 1. Molecular insights into the microbial community of annual bluegrass (poa annua l.) putting green turf. [Doctoral Dissertation]. Rutgers University; 2016. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/49146/


Rutgers University

2. Waller, Timothy James, 1986-. Blueberry and cranberry floral stimulation of Colletotrichum fioriniae and other fruit rotting fungi.

Degree: PhD, Plant Biology, 2019, Rutgers University

Colletotrichum fioriniae is an important hemibiotrophic pathogen limiting both highbush blueberry (Vaccinium corymbosum L.) and cranberry (V. macrocarpon Aiton) production worldwide. Since fungicide applications during bloom are most effective in both crops, the link between host floral signals and pathogen disease cycles were investigated. C. fioriniae as well as two other latent infection forming cranberry fruit rot pathogens C. fructivorum (C. gloeosporioides s.l.) and Coleophoma cylindrospora (C. empetri s.l.) and a mature fruit infecting fungi Allantophomopsis lycopodena were investigated to better describe the temporal dynamics of pathogen stimulation in response to host derived signals produced during bloom. In order quantify this relationship and visualize pathogen responses, host signals isolated via water or chloroform were utilized in extract-dependent bioassays. The results showed that blueberry and cranberry (as well as multiple other ericaceous species) floral extracts (FEs) affected two important disease cycle stages by stimulating an increased rate (+ 200%) and quantity (+ 500%) of secondary conidiation (inoculum build-up) and appressorial formation (infection structures) of C. fioriniae and all other pathogens evaluated, except A. lycopodena, linking bloom period infecting fungi to floral signals. Conidia in the presence of FEs also conferred higher levels of disease on detached fruit than conidia alone, suggesting that apparent disease was a function of increased appressorial formation. Bioactivity was readily detected in floral rainwater runoff and became more stimulatory as proximity to flowers or the bloom period increased, thus indicating both mobility of floral signals and the importance of phenology-specific cues. Chloroform-based extractions provided a chemical mirror of the host cuticles first encountered by pathogens. Characterization of multiple tissue types elucidated fatty acid derivative compositional patterns, where specific stimulatory compounds were more abundant in flower cuticular waxes. Multiple fatty acids were identified that stimulated appressorial formation, however, hexadecanoic fatty acid derivatives were concluded to be the most likely source of stimulation due to the paired bioactivity observations and occurrence of this compound within both water- and chloroform-based extraction types. This research provides strong evidence that flowers contribute substantially to the disease cycle events of replication (sporulation and secondary conidiation) and infection of fruit by C. fioriniae and other bloom period infecting fungi, thus providing evidence as to why the bloom period is often referred to as the critical disease control window.

Advisors/Committee Members: Oudemans, Peter V. (chair), Hillman, Bradley I. (internal member), Kobayashi, Donald Y. (internal member), Polashock, James J. (outside member), School of Graduate Studies.

Subjects/Keywords: Colletotrichum; Blueberries  – Diseases and pests; Cranberries  – Diseases and pests

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Waller, Timothy James, 1. (2019). Blueberry and cranberry floral stimulation of Colletotrichum fioriniae and other fruit rotting fungi. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/61977/

Chicago Manual of Style (16th Edition):

Waller, Timothy James, 1986-. “Blueberry and cranberry floral stimulation of Colletotrichum fioriniae and other fruit rotting fungi.” 2019. Doctoral Dissertation, Rutgers University. Accessed January 15, 2021. https://rucore.libraries.rutgers.edu/rutgers-lib/61977/.

MLA Handbook (7th Edition):

Waller, Timothy James, 1986-. “Blueberry and cranberry floral stimulation of Colletotrichum fioriniae and other fruit rotting fungi.” 2019. Web. 15 Jan 2021.

Vancouver:

Waller, Timothy James 1. Blueberry and cranberry floral stimulation of Colletotrichum fioriniae and other fruit rotting fungi. [Internet] [Doctoral dissertation]. Rutgers University; 2019. [cited 2021 Jan 15]. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61977/.

Council of Science Editors:

Waller, Timothy James 1. Blueberry and cranberry floral stimulation of Colletotrichum fioriniae and other fruit rotting fungi. [Doctoral Dissertation]. Rutgers University; 2019. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61977/

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