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TRANSIENT SI AND THE DYNAMICS OF SELF‐INCOMPATIBILITY ALLELES: A SIMULATION MODEL AND EMPIRICAL TEST
Author(s) -
Goodwillie Carol
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.1558-5646.2008.00429.x
Subject(s) - biology , allele , diallel cross , selection (genetic algorithm) , genetic diversity , evolutionary biology , genetic drift , genetics , genetic variation , botany , gene , population , demography , computer science , sociology , hybrid , artificial intelligence
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.