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Does frequency-dependent selection with complex dominance interactions accurately predict allelic frequencies at the self-incompatibility locus in Arabidopsis halleri?
- Source :
-
Evolution; international journal of organic evolution [Evolution] 2008 Oct; Vol. 62 (10), pp. 2545-57. Date of Electronic Publication: 2008 Aug 25. - Publication Year :
- 2008
-
Abstract
- Frequency-dependent selection is a major force determining the evolutionary dynamics of alleles at the self-incompatibility locus (S-locus) in flowering plants. We introduce a general method using numerical simulations to test several alternative models of frequency-dependent selection on S-locus data from sporophytic systems, taking into account both genetic drift and observed patterns of dominance interactions among S-locus haplotypes (S-haplotypes). Using a molecular typing method, we estimated S-haplotype frequencies in a sample of 322 adult plants and of 245 offspring obtained from seeds sampled on 22 maternal plants, collected in a single population of Arabidopsis halleri (Brassicaceae). We found eight different S-haplotypes and characterized their dominance interactions by controlled pollinations. We then compared the likelihood of different models of frequency-dependent selection: we found that the observed haplotype frequencies and observed frequency changes in one generation best fitted a model with (1) the observed dominance interactions and (2) no pollen limitation. Overall, our population genetic models of frequency-dependent selection, including patterns of dominance interactions among S-haplotypes and genetic drift, can reliably predict polymorphism at the S-locus. We discuss how these approaches allow detecting additional processes influencing the evolutionary dynamics of the S-locus, such as purifying selection on linked loci.
Details
- Language :
- English
- ISSN :
- 0014-3820
- Volume :
- 62
- Issue :
- 10
- Database :
- MEDLINE
- Journal :
- Evolution; international journal of organic evolution
- Publication Type :
- Academic Journal
- Accession number :
- 18647339
- Full Text :
- https://doi.org/10.1111/j.1558-5646.2008.00469.x