Dissertation/Thesis Abstract

Exploring the Role of Host Species and Abiotic Factors on Epiphytic Bacterial Communities in Prickly Pear Cactus
by Didesch, Taylor, M.S., Mississippi State University, 2020, 111; 28028130
Abstract (Summary)

The microorganisms that live in and on a host (the microbiome) influence host phenotype, health, and behavior in plants and animals. However, the effects of the host and environment on the composition of microbiome communities are unclear. This is especially true in arid and semi-arid environments such as deserts that filter many microorganisms. This study investigated variation in phyllosphere microbiotal bacterial assemblages of prickly pear cactus (Opuntia) across differing spatial scales, ecoregions, and taxa throughout Texas at two timepoints. I expected bacterial assemblages to differ significantly among Texas ecoregions and among species. Results support significant influences on bacterial assemblage composition including ecoregion, taxonomy, and potentially seasonal time of sampling. The dry season timepoint yielded high microbial diversity and abundance across species and ecoregions, with different species and ecoregions harboring unique microbial communities. The rainy season timepoint yielded significantly lower levels of microbial diversity and abundance across species and ecoregions.

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Indexing (document details)
Advisor: Jordan, Heather
Commitee: Brooks, Christopher P., Barton, Brandon
School: Mississippi State University
Department: Biological Sciences
School Location: United States -- Mississippi
Source: MAI 82/2(E), Masters Abstracts International
Subjects: Ecology, Microbiology, Botany
Keywords: Cactus, Epiphyte, Microbiome, Phyllosphere
Publication Number: 28028130
ISBN: 9798664757675
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