Self-incompatibility responses, genetically determined by alleles at the S locus, prevent self-fertilization in many species of flowering plants. Recent biochemical and genetic studies on families with sporophytic or gametophytic control of incompatibility suggest that S alleles encode specific glycoproteins expressed in the pistil and pollen. Self-incompatibility sequences are conserved within families. In Brassica (sporophytic control) different S alleles show strong homology, and may differ by a number of small replacements and rearrangements.
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Nasrallah et al. (1986) studied this question.
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