Summary
The sporophytic self-incompatibility system of Brassica species is controlled by a single locus, S. Recognition of self between pollen and stigma is probably mediated by S locus-specific glycoproteins (SLSGs). We describe the isolation, from an S 29 homozygote of Brassica oleracea, of two different cDNA clones for transcripts which are equally abundant in stigmas competent for self-incompatibility and each of which is homologous to previously reported SLSG sequences. Extensive DNA sequence divergene between the two clones precludes their cross-hybridisation and each acts as a gene-specific probe. All S genotypes appear to have a single copy of each gene but there are significantly different levels of polymorphism associated with each. The clear structural homology between the two indicates a gene duplication involving the S locus and, perhaps, related to the evolution of self-incompatibility.
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Communicated by H. Saedler
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Trick, M., Flavell, R.B. A homozygous S genotype of Brassica oleracea expresses two S-like genes. Mol Gen Genet 218, 112–117 (1989). https://doi.org/10.1007/BF00330573
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DOI: https://doi.org/10.1007/BF00330573