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Abstract Detail


Systematics Section

Roalson, Eric [1], Chung, Kyong-Sook [2], Hipp, Andrew L. [2], Laws, Elizabeth I. [1], Stack, Gordon P. [1].

Contributions of low copy number nDNA and cpDNA spacers towards a phylogeny of Carex subgenus Vignea (Cyperaceae).

Carex (Cyperaceae) is one of the most diverse and most taxonomically difficult groups of angiosperms, with more than 2000 recognized species and 70+ sections. Taxonomy of the genus is further complicated by the fact that Carex is paraphyletic relative to the other four genera of Cariceae. One of the few Carex lineages consistently supported as monophyletic is Carex subgenus Vignea. Relationships within Vignea, however, are poorly understood, and molecular phylogenetic analyses to date have suggested that most sections are polyphyletic. Complicating our understanding of this lineage is the fact that all current phylogenetic hypotheses in the subgenus have used nrDNA spacers as their data source, and these have been recently shown to be affected in Vignea by shallow and deep lineage sorting, persistence of non-recombining paralogs within species, and possibly hybridization. In an attempt to clarify relationships in this clade and provide a framework for studies of character evolution, biogeography, and classification, we will present preliminary data from low copy number nuclear gene families and cpDNA spacer regions to assess their abilities to accurately reconstruct lineage diversification in Carex subgenus Vignea.


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1 - Washington State University, School of Biological Sciences, Po Box 644236, Pullman, Washington, 99164-4236, USA
2 - The Morton Arboretum, 4100 Illinois Route 53, Lisle, IL, 60532-1293, USA

Keywords:
Carex
Cyperaceae
nuclear genes
phylogenetics.

Presentation Type: Oral Paper:Papers for BSA Sections
Session: 68
Location: Cottonwood D/Snowbird Center
Date: Wednesday, July 29th, 2009
Time: 1:45 PM
Number: 68004
Abstract ID:406


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