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Systematics Section / ASPT

King, Matthew [1], Roalson, Eric [1].

Examination of molecular evolutionary dynamics of nrDNA in inferring phylogenetic relationships in Carex subgenus Vignea (Cyperaceae).

Carex subgenus Vignea (Cyperaceae) includes approximately 320 species and is organized into approximately 25 sections. Recent molecular phylogenetic studies have suggested that subgenus Vignea forms a well-supported monophyletic group, but relationships within Vignea are more problematic. Past classifications of Vignea have loosely placed most of the species into sections based on discontinuities in complex morphological characters and recent phylogenetic analyses has suggested that limits of several of these sections do not coincide with phylogenetic patterns. We will explore the role non-coding nuclear ribosomal DNA paralogs and psuedogenes play in confounding our assessment of the sectional and specific limits of many androgynous Vignea. The potential impact of hybridization and lineage sorting among supposedly distantly related taxa is currently under investigation. We will also discuss the impacts of these findings on positional homology of nrDNA sequences, and analyses that can identify these potential issues.


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1 - Washington State University, School of Biological Sciences, Po Box 644236, Pullman, Washington, 99164-4236, USA

Keywords:
Carex
Vignea
Cyperaceae
nrDNA
molecular phylogenetics
paralogs.

Presentation Type: Oral Paper
Session: 3-8
Location: Salon J - Austin Grand Ballroom/Hilton
Date: Monday, August 15th, 2005
Time: 10:30 AM
Abstract ID:207


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