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Abstract Detail


Systematics Section

Garrett, Patrick C.  [1], Ingram, Amanda L. [1].

The utility of the plastid trnC-rpoB locus in resolving phylogenetic relationships in Eragrostis (Poaceae) .

Eragrostis Wolf is a genus of approximately 400 morphologically and anatomically diverse grasses distributed throughout the world's tropical and subtropical regions. DNA sequence data from nuclear GBSSI (waxy)and the plastid regions rps16 and trnL-F have improved our understanding of Eragrostis evolution: all regions have provided insight into the circumscription of the genus, and GBSSI data produce awell-resolved phylogeny within Eragrostis. Cladistic analyses of the plastid loci, however, fail to resolve a large polytomy at the base of a clade encompassing the vast majority of Eragrostis species. Resolving these relationships is essential for understanding the ways in which allopolyploidy has influenced character evolution, so this study seeks to explore the potential of the trnC-rpoBlocus in elucidating the evolutionary history of the genus. Sequences were obtained for a broad sample of Eragrostisspecies and were analyzed alone and in combination with rps16and trnL-F. trnC-rpoB alone did not vary sufficiently for resolving the divergence of core Eragrostis, but the combined analysis did show improved resolution.

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1 - Wabash College, Biology Department, PO Box 352, Crawfordsville, IN, 47933, USA

Keywords:
Eragrostis
Chloridoideae
Poaceae
trnC-rpoB
phylogenetics.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Khorassan Ballroom/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 5:30 PM
Number: PSY054
Abstract ID:43


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