Dissertation/Thesis Abstract

The effects of endophytic Epichloë species on host plant fitness of two native grasses, Poa alsodes and Achnatherum robustum
by Shymanovich, Tatsiana, Ph.D., The University of North Carolina at Greensboro, 2016, 175; 10123674
Abstract (Summary)

Most plants harbor microbial symbionts, which often affect host performance and fitness. Endophytic Epichloë species are systemic fungal microbial symbionts of many cool-season pooid grasses. Benefits to the host from Epichloë infection include increased resistance to stressful environmental factors, such as drought and limited soil nutrients, due to morphological and physiological changes. The major benefit of Epichloe infection is enhanced protection against herbivory due to production of fungal alkaloids. The fungal alkaloids have varying activity against invertebrate or mammalian grazers. Although Epichloë endophytes are well-studied in agronomic grasses such as tall fescue and perennial ryegrass, little is known about the how the presence of different endophyte species and their frequencies and distribution are related to environmental factors in native grasses. Using two native grasses to eastern [Poa alsodes (Grove Bluegrass)] and western [Achnatherum robustum (Sleepygrass)] North America, I addressed the following questions: 1) how are endophyte species distributed among populations along a latitudinal gradient, 2) what fungal alkaloids are produced by different endophyte species, 3) how do fungal alkaloids affect insect herbivores, and 4) what are the effects of different endophytes on host plant growth? (Abstract shortened by ProQuest.)

Indexing (document details)
Advisor: Faeth, Stanley H.
Commitee: Cech, Nadja B., Lacey, Elizabeth P., Remington, David L., Young, Carolyn A.
School: The University of North Carolina at Greensboro
Department: Biology
School Location: United States -- North Carolina
Source: DAI-B 77/10(E), Dissertation Abstracts International
Subjects: Biology, Molecular biology, Ecology
Keywords: Alkaloid detection, Alkaloid genotypes, Endophyte distribution, Epichloe species, Insect herbivory protection, Intraspecific hybrid
Publication Number: 10123674
ISBN: 978-1-369-00187-7
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