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DOES FREQUENCY‐DEPENDENT SELECTION WITH COMPLEX DOMINANCE INTERACTIONS ACCURATELY PREDICT ALLELIC FREQUENCIES AT THE SELF‐INCOMPATIBILITY LOCUS IN ARABIDOPSIS HALLERI ?
Author(s) -
Llaurens Violane,
Billiard Sylvain,
Leducq JeanBaptiste,
Castric Vincent,
Klein Etienne Karl,
Vekemans Xavier
Publication year - 2008
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.2008.00469.x
Subject(s) - biology , locus (genetics) , haplotype , allele , dominance (genetics) , evolutionary biology , population , allele frequency , genetics , frequency dependent selection , gene , demography , sociology
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.