Interactions between the pollen tube or pollen grain and the sporophytic tissue of the pistil control development of the male gametophyte in self-incompatible (SI) angiosperms. Matching specificities coded by alleles at the S (incompatibility) locus alter pollen germination or pollen tube growth such that fertilization does not occur. Numerous S alleles exist for most SI species and are identified by subscript numbers. An important feature of SI is that both male and female gametes are functional but inbreeding is prevented.
KeywordsPollen Tube Pollen Tube Growth Callose Plug Incompatible Pollen Tube Self Compatible Species
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