Abstract
Sporophytic self-incompatibility systems were studied by using deterministic computer simulation. Frequencies of individual S alleles, or combinations of S alleles, were set at 0.001 of their equilibrium frequency and observations were made on the speed with which equilibrium was restored. Ten cases were studied, each of which had three variants regarding the site of dominance, i.e., in the pollen, in the stigma, and in both sexes. Dominant alleles regained equilibrium much faster than did recessive alleles, but both types were slower than the 11th case in which all alleles acted individually. Alleles that acted independently of the dominance series were almost as slow to regain equilibrium as were the recessive alleles. Models with dominance confined to the pollen were unstable in that all of the recessive alleles except one could become extinct. The results are discussed in terms of known sporophytic systems and the evolutionary strategies that would enable a species to acquire several pollen recessive S alleles.
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