| Abstract Detail
Molecular Ecology and Evolution Pérez Alquicira, Jessica [1], Dominguez, César [1]. The evolution of the reproductive system of Oxalis alpina in the Sky Islands region (Southwestern USA and Northwestern Mexico). The evolution of the reproductive system is a fascinating field in evolutionary biology. The study of tristyly systems (three floral morphs and an incompatibility system that prevent self-fertilization and fertilization between stigma and anther at the same level) are especially interesting due to the great susceptibility of evolving into other reproductive systems. In this work we study the evolution of tristyly in Oxalis alpina in the Sky Islands region, a place where populations are at the top of a mountain, and are isolated (one of them in a wide expanse of desert). We have found that in each mountain range the mating system is different. For example, we can see typical tristylous populations where the three morphs are in the same proportions, as well as distylous populations where one of the morphs has disappeared. Also, we have found an enormous variation in the frequency of the morphs. In this scenario we have investigated the evolution dynamics of tristyly through two approaches: populations genetics and phylogeography. Our results suggest that the evolution to distyly ocurred once due to distylous populations were a monophyletic group. The results also show a high level of genetic variation in tristylous, and low levels in distylous, suggesting that the loss of one morph causes a decrease in levels of genetic diversity.
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1 - Universidad Nacional Autonoma de Mexico, Instituto de Ecologia, Ciudad Universitaria, A.P. 70-275, Mexico, D.F., 04510, Mexico
Keywords:
population genetics
phylogeography
tristyly
Pleistocene.
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: P74008
Abstract ID:2258 |
