Number of alleles at the incompatibility loci in Secale cereale L.

Two experiments were performed to estimate the number of alleles at the two incompatibility loci of rye in the variety 'Halo'. In one experiment I1 progenies from enforced selfing under controlled conditions were isolated. In the other experiment a genotype, homozygous at both incompatibility loci, was used as pollinator for a sample of the 'Halo' population, which was regarded as an equilibrium population. Genotypes, which are homozygous at both incompatibility loci, can be found after selfing. The estimate for the number of alleles was 6 to 7 at one locus and 12 to 13 at the other locus.