Balancing selection in the wild: Testing population genetics theory of self-incompatibility in the rare species Brassica insularis - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Genetics Année : 2005

Balancing selection in the wild: Testing population genetics theory of self-incompatibility in the rare species Brassica insularis

Résumé

Self-incompatibility (SI) systems are widespread mechanisms that prevent self-fertilization in angiosperms. They are generally encoded by one genome region containing several multiallelic genes, usually called the S-locus. They involve a recognition step between the pollen and the pistil component and pollen is rejected when it shares alleles with the pistil. The direct consequence is that rare alleles are favored, such that the S-alleles are subject to negative frequency-dependent selection. Several theoretical articles have predicted the specific patterns of polymorphism, compared to neutral loci, expected for such genes under balancing selection. For instance, many more alleles should be maintained and populations should be less differentiated than for neutral loci. However, empirical tests of these predictions in natural populations have remained scarce. Here, we compare the genetic structure at the S-locus and microsatellite markers for five natural populations of the rare species Brassica insularis. As in other Brassica species, B. insularis has a sporophytic SI system for which molecular markers are available. Our results match well the theoretical predictions and constitute the first general comparison of S-allele and neutral polymorphism.

Dates et versions

halsde-00325084 , version 1 (26-09-2008)

Identifiants

Citer

Sylvain Glémin, Thierry Gaude, Marie-Laure Guillemin, Mathieu Lourmas, Isabelle Olivieri, et al.. Balancing selection in the wild: Testing population genetics theory of self-incompatibility in the rare species Brassica insularis. Genetics, 2005, 171 (1), pp.279-289. ⟨10.1534/genetics.104.035915⟩. ⟨halsde-00325084⟩
182 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More