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Abstract Detail


Systematics Section / ASPT

Simpson, Lorae [1], Datwyler, Shannon L [1].

Testing the Hypothesis of Hybrid Speciation in Penstemon newberryi var. berryi.

Hybrid speciation is a central issue in plant evolutionary biology. Penstemon (Veronicaceae) is the largest genus of plants endemic to North America, and is well known for examples of pollinator diversity and hybridization. Penstemon newberryi var. berryi is a geographically-isolated, but morphologically variable member of subg. Dasanthera. Based on morphological variation and diversity in pollinator visitation in subg. Dasanthera, we are investigating the hypothesis that P. newberryi var berryi is of hybrid origin between two species that differ in floral morphology and pollination biology. Using a combination of morphological data, pollinator observations, nectar characteristics, and molecular markers, we are examining variation 146 individuals representing eight populations from three taxa in the P. newberryi complex to test the hypothesis of hybrid speciation in P. newberryi var. berryi. Floral morphology and nectar characteristics differ among members of this complex, and are associated with the primary pollinators. Furthermore, amplified fragment length polymorphism (AFLP) markers are providing molecular data to further address the question of hybrid speciation. Preliminary analyses have revealed several potential markers that are found in potential parental species. The use of AFLP markers and supplemental morphological data will facilitate the assessment of a hybrid relationship and if proven will provide a greater understanding of the role of hybridization in the evolutionary history of Penstemon subg. Dasanthera.


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1 - California State University, Sacramento, Department of Biology, 6000 J Street, Sacramento, Ca, 95819, USA

Keywords:
none specified

Presentation Type: Poster:Posters for Sections
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P59056
Abstract ID:941


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