Abstract
Six plants of a self-incompatible population ofLeavenworthia çrassa were grown from seed collected in nature and cross-pollinated in all combinations. The incompatibility relationships between sibs were determined in eleven of the F1 families. A one-locus sporophytic incompatibility system was established. None of the parents was homozygous at the S locus. At least five, and possibly all six, of the parents did not share an S allele. Only one pair of alleles was shown to have different interactions in the pollen and stigmata. The identity and expression of the S alleles were determined in six families. Eight pairs of alleles were independently expressed in both the pollen grains and the stigmata. Sixteen pairs of alleles showed dominance of one allele over the other in the pollen grains or the stigmata or both.
F1 plants of two crosses between different self-incompatible races were self-incompatible. F1 plants of six crosses between self-incompatible and self-compatible races were self-incompatible; in five of the families, the frequency of pseudo-compatibility was higher than in the self-incompatible parent. Self-incompatible hybrids from a cross between a self-incompatible and a self-compatible population provide a method for rapidly determining allelic interactions in plants with a sporophytic incompatibility system.
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The research was carried out at the Biological Laboratories, Harvard University, Cambridge, Massachusetts, U.S.A.
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Lloyd, D.G. The genetics of self-incompatibility inLeavenworthia crassa rollins (Cruciferae). Genetica 38, 227–242 (1967). https://doi.org/10.1007/BF01507461
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DOI: https://doi.org/10.1007/BF01507461