Mississippi State University
Brooks, Christopher P.
Date of Degree
Graduate Thesis - Open Access
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.
Didesch, Taylor, "Exploring the role of host species and abiotic factors on epiphytic bacterial communities in prickly pear cactus" (2020). Theses and Dissertations. 2181.