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Science 26 November 1999:
Vol. 286. no. 5445, p. 1645
DOI: 10.1126/science.286.5445.1645a
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Self-incompatibility in certain plants allows a plant to distinguish its own pollen from among that of other plants of the same species, and preferentially react to nonself pollen in order to limit inbreeding (see the Perspective by Dickinson). Stone et al. (p. 1729) have analyzed the activities of ARC1, which shows a phosphorylation-dependent interaction with a kinase located in the stigmatic plasma membrane. Their in vivo studies show that ARC1 is a key regulator of self-incompatibility from the female side. Schopfer et al. (p. 1697) have now identified a critical component from the pollen side--a polymorphic protein expressed in the pollen that interacts with the stigmatic proteins to determine whether the outcome will be fertile.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)