| Abstract Detail
Conservation Biology Prince, Linda [1], Porter, J. Mark [2]. Phylogenetic position of Peirson’s Milkvetch within Astragalus section Inflati, subsection Proriferi. Peirson’s milkvetch [Astragalus magdalenae E.L. Greene var. peirsonii (Munz & McBurney) Barneby] is listed as an endangered species under the California Endangered Species Act and as a threatened species, under the federal Endangered Species Act. This little-known taxon is believed to occur only at the Algodones Dunes in Imperial County, near Borrego Springs, in San Diego County, California, and in the Gran Desierto of Sonora, Mexico. Currently, this taxon is treated as a variety of a much more widespread species; however, there is morphological evidence that species status may be more appropriate. We used DNA sequence data from a number of quickly evolving spacer regions of the chloroplast genome to address the relationships among Peirson’s milkvetch and other members of Astragalus sect. Inflati, subsect. Proriferi. We also collected population genetic data (fluorescent ISSRs) to assess the genetic diversity of the various populations of Astragalus magdalenae var. peirsonii relative to its more widespread relative Astragalus magdalenae var. magdalenae. These data indicate a sister relationship between the two named varieties, but also show higher numbers of sequence substitutions between the two taxa than among the other species of subsection Proriferi. These data provide evidence to support the recognition of Peirson’s milkvetch at the rank of species.
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1 - Rancho Santa Ana Botanic Garden, 1500 North College Avenue, Claremont, California, 91711-3157, USA
2 - Rancho Santa Ana Botanic Garden, 1500 North College Avenue, Claremont, CA, 91711-3157, USA
Keywords:
Astragalus
cpDNA
Fabaceae
fluorescent ISSRs
phylogenetics
population genetics.
Presentation Type: Poster:Posters for Topics
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P65008
Abstract ID:1947 |
