Systematics/Phytogeography / Taxonomie/ Section
Chouinard, Brianna N , Starr, Julian R. , Naczi, Robert F. C. .
Barcodes and relationships of the North American sedges, north of Mexico (Carex, Cariceae, Cyperaceae).
With over 560 taxa in nearly every terrestrial habitat, the genus Carex (sedges) represents one of the most significant plant groups in the Flora of North America (FNA) region in terms of its ecology and diversity. Unfortunately, identifying and arranging this diversity into natural groups has been a considerable challenge due to the genus’ great diversity and reduced morphology. We are examining the utility of four coding (matK, rpoC1, rpoB, rbcL) and three non-coding (psbA–trnH, atpF-atpH, psbK-psbI) chloroplast markers as potential plant barcoding regions for recognizing North American Carex species and for determining their relationships. Three samples representing the distribution of each taxon will be sequenced for a total of 1677 samples for the FNA region. To date, two thirds of this sampling has been accomplished. Initial results indicate that the highest species resolution is obtained using matK alone. For some sections, like Carex section Phyllostachyae, matK can resolve the majority of species and provide nearly as many informative characters as the ITS region of nrDNA. Combining matK with additional coding loci does not improve species resolution, although statistical support for trees increases. Phylogenetic analyses of combined coding sequences produce trees that clearly distinguish and support the three major clades (Core Carex, Caricoid, Vignea) obtained in previous studies.
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1 - Canadian Museum of Nature / University of Ottawa, Research Division / Department of Biology, PO Box 3443 stn \"D\" / Gendron Hall, room 160, 30 Marie Curie, Ottawa, Ontario, K1P 6P4 / K1N 6N5, Canada
2 - Canadian Museum of Nature / University of Ottawa, Research Division / Department of Biology, PO Box 3443 stn D / Gendron Hall, room 160, 30 Marie Curie, Ottawa, Ontario, K1P 6P4 / K1N 6N5, Canada
3 - Delaware State University, Claude E. Phillips Herbarium, Department Agriculture & Natural Resources, 1200 N Dupont Highway, Dover, Delaware, 19901-2277, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Room 1/Woodward
Date: Monday, July 28th, 2008
Time: 2:00 PM