Abstract
Publisher Summary The majority of flowering plant species are hermaphrodites and possess flowers in which the male and female organs are in close proximity. Despite this proximity, outcrossing is favored in a large number of these species because of the action of self-incompatibility (SI) systems that permit the pistil to reject self-pollen. The chapter discusses the nature of the male component, the putative ligand for the S-locus receptor-like kinase (SRK) receptor. This is important with regard to the mechanism of SI because it would provide a means of testing the hypothesis that the members of the receptor tyrosine kinase (RLK) superfamily function as receptors. A major advantage of the SI system is that the male component of the SI response is predicted to be encoded by a gene located at the S locus. A combination of biochemical and map-based approaches will lead to the identification of this gene in the near future.
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