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1 August 2008 Transient Si and the Dynamics of Self-Incompatibility Alleles: A Simulation Model and Empirical Test
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Abstract

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.

Carol Goodwillie "Transient Si and the Dynamics of Self-Incompatibility Alleles: A Simulation Model and Empirical Test," Evolution 62(8), 2105-2111, (1 August 2008). https://doi.org/10.1111/j.1558-5646.2008.00429.x
Received: 11 December 2007; Accepted: 26 April 2008; Published: 1 August 2008
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