Systematics/Phytogeography / Taxonomie/ Section
Harris, James G. , Dickey, Thayne , Knight, Julie A , Oliver, Jason , Paxton, David .
Phylogenetic relationships of Great Basin alpine and subalpine Draba (Brassicaceae) inferred from nrDNA ITS, Chalcone synthase, and trnL-trnF DNA sequences.
Draba, the largest genus in the Brassicaceae, is well represented in the high mountain ranges of the Great Basin in the western United States. Several species are endemic to single ranges, while many others are quite broadly distributed both within the Great Basin and beyond. Phylogenetic relationships among these geographically isolated Draba taxa are often unclear. Previous molecular studies of selected western North American Draba species using ITS sequence data demonstrated that they fall into two strongly supported clades, one consisting of aneuploid species and the other composed of euploid species. ITS sequence data, however, provided little within-clade resolution. The purpose of our study was to examine several Great Basin Draba species not included in previous molecular work in the genus. In addition to the ITS region, we included DNA sequence data from a low-copy nuclear gene (Chalcone synthase) and from the chloroplast genome (trnL-trnF spacer) to improve phylogenetic resolution.
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1 - Utah Valley University, Biology, 800 West University Pkwy., Orem, UT, 84058, USA
2 - Utah Valley University, Biology, 800 West University Pkwy, Orem, UT, 84058, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Room 1/Woodward
Date: Monday, July 28th, 2008
Time: 12:00 PM