The genetic consequences of evolving two sexes: the genetic structure of distylous and dioecious species of Erythroxylum
Por:
Abarca, CA, Martinez-Bauer, A, Molina-Freaner, F, Dominguez, CA
Publicada:
1 feb 2008
Categoría:
Ecology, Evolution, Behavior and Systematics
Resumen:
Question: Is the evolution of dioecy associated with increasing levels of genetic variation? Background and hypothesis: Dioecy and self-incompatibility are seen as alternative mechanisms promoting outcrossing and avoiding the deleterious effects of inbreeding depression. Under this formulation, we would expect similar genetic variation between dioecious and self-incompatible species. In contrast, differences in genetic variation between these two breeding systems would indicate that sexual specialization has genetic effects that go beyond the avoidance of inbreeding. Organisms and methods: We studied the genetic structure of one distylous and one dioecious species of Erythroxylum by means of ISSR markers. We measured the level and distribution of genetic diversity in five populations of the dioecious E. rotundifolium and in six populations of the self-incompatible distylous E havanense. Results: Expected heterozygosity and Shannon genetic diversity in populations of the distylous E. ha
Filiaciones:
Abarca, CA:
Univ Nacl Autonoma Mexico, Inst Ecol, Dept Ecol Evolut, Mexico City 04510, DF, Mexico
Martinez-Bauer, A:
Univ Nacl Autonoma Mexico, Inst Ecol, Dept Ecol Evolut, Mexico City 04510, DF, Mexico
Molina-Freaner, F:
Univ Nacl Autonoma Mexico, Inst Ecol, Dept Ecol Biodiversidad, Hermosillo 83250, Sonora, Mexico
Dominguez, CA:
Univ Nacl Autonoma Mexico, Inst Ecol, Dept Ecol Evolut, Mexico City 04510, DF, Mexico
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