Plant self‐incompatibility systems: a molecular evolutionary perspective
2005
Charlesworth, Deborah | Vekemans, Xavier | Castric, Vincent | Glémin, Sylvain
Incompatibility recognition systems preventing self‐fertilization have evolved several times in independent lineages of Angiosperm plants, and three main model systems are well characterized at the molecular level [the gametophytic self‐incompatibility (SI) systems of Solanaceae, Rosaceae and Anthirrhinum, the very different system of poppy, and the system in Brassicaceae with sporophytic control of pollen SI reactions]. In two of these systems, the genes encoding both components of pollen‐pistil recognition are now known, showing clearly that these two proteins are distinct, that is, SI is a lock‐and‐key mechanism. Here, we review recent findings in the three well‐studied systems in the light of these results and analyse their implications for understanding polymorphism and coevolution of the two SI genes, in the context of a tightly linked genome region.
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