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Abstract Detail

Systematics Section/ASPT

Pembrook, James [1], Bruederle, Leo [1], Dunlop, Debra [2].

Phylogenetics of Carex section Scirpinae Tuckerman (Cyperaceae).

Although much research has been conducted addressing the molecular systematics of Carex L. (Cyperaceae), resolving relationships among subspecies and even species within sections remains elusive. Carex section Scirpinae Tuckerman is a small, predominately North American section distinguished by a dioecious breeding system and unispicate inflorescences. Dunlop’s (1990, 1997, 1999) treatments of the section recognized two species: Carex scirpoidea Michaux and C. curatorum Stacey, with the former including ssp. scirpoidea, ssp. convoluta (Kükenthal) Dunlop, ssp. pseudoscirpoidea (Rydberg) Dunlop, and ssp. stenochlaena (Holm) Löve & Löve. In order to generate phylogenetic hypotheses for the section, total genomic DNA was extracted, amplified, and sequenced for nuclear (ETS, ITS) and chloroplast (atpF, rps16) regions. Sequences were obtained for a minimum of two individuals for each of the taxa within the section; this sample included collections vouchered by Dunlop. Carex section Scirpinae including C. scabriuscula Mackenzie (sensu lato) forms a monophyletic clade with strong bootstrap support (100%) in combined nrDNA and cpDNA phylogenies. Carex scabriuscula also forms a well-supported (100%) monophyletic clade, as does section Scirpinae sensu stricto (99%). Although clear morphological differences separate the species and subspecies comprising Carex section Scirpinae, only C. scirpoidea ssp. pseudoscirpoidea segregates independently in the combined nrDNA and cpDNA phylogenies (84%); none of the other taxa within the section as delimited by Dunlop segregate independently in any phylogeny, including C. curatorum; this may reflect incomplete lineage sorting or past hybridization.

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1 - University of Colorado Denver, Integrative Biology, Campus Box 171, Denver, CO, 80217-3364, USA
2 - New England College, Biology, 98 Bridge Street, Henniker, NH, 03242, USA


Presentation Type: Poster:Posters for Sections
Session: P
Location: Grand Salon A - D/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 5:30 PM
Number: PSY066
Abstract ID:498
Candidate for Awards:Genetics Section Poster Award

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