Molecular Ecology and Evolution
Datwyler, Shannon .
Testing the hypothesis of the hybrid origin of Penstemon newberryi var. berryi (Plantaginaceae).
Penstemon subgenus Dasanthera (Plantaginaceae) is a small group of evergreen subshrubs characterized by the presence of wooly hairs on the anthers. Two distinct floral morphologies are found in the subgenus: purple-flowered species with anthers included in the corolla tube and magenta-pink flowered species with anthers exserted from the corolla tube. Intraspecific hybridization is common within the subgenus, both between purple-flowered species and between purple and magenta-flowered species. Penstemon newberryi, a magenta-colored species is widely distributed in the mountains of California. One variety, var. berryi varies from the typical floral morphology with intrapopulational variation in both corolla color and anther position. This study is testing the hypothesis of hybrid speciation in the origin of P.newberryi var. berryi. Three populations of P. newberyi var. newberryi, four populations of purple-flowered species (both P. davidsonii and P.cardwellii) and three populations of P.newberryi var. berryi were surveyed for variation in cpDNA haplotypes, AFLP variation and variation at eight microsatellite loci. Preliminary results show that P. newberryi and purple-flowered species can be discriminated based on cpDNA haplotypes. Furthermore, P. newberryi var. berryi shares haplotypes with both purple-flowered species and P.newberryi var. newberryi, supporting the hypothesis of the hybrid origin of P. newberryi var. berryi. Microsatellite and AFLP analyses are currently underway and will provide additional evidence to test this hypothesis.
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1 - CSU Sacramento, Biological Sciences, 6000 J Street, Sacramento, CA, 95819-6077, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Union B/Hyatt
Date: Monday, July 9th, 2012
Time: 1:30 PM