4.5 Article

Transient SI and the dynamics of self-incompatibility alleles: A simulation model and empirical test

Journal

EVOLUTION
Volume 62, Issue 8, Pages 2105-2111

Publisher

WILEY
DOI: 10.1111/j.1558-5646.2008.00429.x

Keywords

allele frequency; computer simulation; frequency-dependent selection; mating system evolution; partial self-incompatibility

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A stochastic computer simulation model was created to compare the combined effects of selection and genetic drift on the dynamics of S-alleles under full sporophytic self -incompatibility (SI) versus transient SI, a form of partial SI in which flowers become self-compatible as they age. S-alleles were lost more rapidly with transient than with full SI, as is expected with weakened frequency-dependent selection. Based on these results, equilibrium S-allele diversity is expected to be lower with partial SI for populations of comparable size and migration rates. Consistent with model results, a comparison of the proportion of incompatible crosses in full diallel experiments for a fully SI and a transiently SI species in the annual genus Leptosiphon suggests that S-allele diversity is lower in the partially SI species. Results of the simulation model indicate that the transmission advantage of self-fertilization can have complex effects on S-allele dynamics in partial SI systems.

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