Evolution of homomorphic sporophytic self-incompatibility

摘要: A population genetic model is described for the evolution of sporophytic self-incompatibility by successive mutations to active incompatibility alleles from an ancestral compatibility, Sf, allele, homozygotes which are capable self-fertilisation. For spread there must be strong inbreeding depression. It shown that polymorphism allele and generated, unless number becomes very large. Thus, although selection cause outcrossing, such polymorphic populations would not completely but have selling rates between zero selfiing rate homozygote Sf. The equilibrium frequencies depend on whether dominance or independent action assumed in pistil. In either case higher than gametophytically acting alleles.