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Genetics Section

Ellis, Mark W. [1], Roper, Jessie M. [2], Gainer, Rochelle E. [1], Wolf, Paul G. [1].

Genetic analyses of Eriogonum corymbosum populations.

The shrubby buckwheat Eriogonum corymbosum is a widely distributed species in the western US that shows a good deal of morphological and ecological variation over its geographic range. The species is currently treated as a complex of taxonomic varieties. The group presents challenges as a result of a putative history of dispersion, isolation, divergence, and hybridization. The apparently distinctive combination of morphological characters and ecological conditions attributed to the disjunct metapopulation of E. corymbosum found in Clark County, NV, has resulted in the proposal of a new varietal placement for these plants. Our objective is to examine and compare the genetic variability within and among E. corymbosum plants in Clark County with the genetic variability within and among similar populations in the region, particularly Utah and Arizona. Cluster analyses using data from amplified fragment length poymorphisms (AFLPs) show the Nevada metapopulation to be relatively distinct. Using sequence data from chloroplast DNA, we found base-pair polymorphisms that separate the Nevada plants from those populations we found in our analyses to be most closely related. We will present our results that, based on AFLP and chloroplast sequence data, suggest the varietal designation for the Nevada metapopulation, in light of the level of genetic divergence, is warranted.


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1 - Utah State University, Department of Biology, College of Science, 5305 Old Main Hill, Logan, Utah, 84322, USA
2 - Utah State University, Biology, 5305 Old Main Hill, Logan, Utah, 84322, USA
3 - Utah State University, Department of Biology, College of Science, 5305 Old Main Hill, Logan, Utah, 84322, USA

Keywords:
population genetics
Phylogeography
conservation
Polygonaceae.

Presentation Type: Oral Paper
Session: 1-9
Location: 412/Hilton
Date: Monday, August 15th, 2005
Time: 10:15 AM
Abstract ID:307


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