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Journal of Experimental Botany, Vol. 54, No. 380, pp. 115-122, January 1, 2003
© 2003 Oxford University Press

S-RNase-mediated self-incompatibility

Received 12 April 2002; Accepted 1 August 2002

Yan Wang1, Xi Wang2, Andrea L. Skirpan2 and Teh-hui Kao3,1,2

1 Intercollege Graduate Degree Program in Plant Physiology, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
2 Department of Biochemistry and Molecular Biology, 403 Althouse Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802, USA

3 To whom correspondence should be addressed at The Department of Biochemistry and Molecular Biology. Fax: +1 814 863 9416. E-mail: txk3{at}psu.edu

The Solanaceae, Rosaceae, and Scrophulariaceae families all possess an RNase-mediated self-incompatibility mechanism through which their pistils can recognize and reject self-pollen to prevent inbreeding. The highly polymorphic S-locus controls the self-incompatibility interaction, and the S-locus of the Solanaceae has been shown to be a multi-gene complex in excess of 1.3 Mb. To date, the function of only one of the S-locus genes, the S-RNase gene, has been determined. This article reviews the current status of the search for the pollen S-gene and the current models for how S-haplotype specific inhibition of pollen tubes can be accomplished by S-RNases.

Key words: Pollen–pistil interactions, self-incompatibility, self/non-self recognition, S-locus, Solanaceae, S-RNase.


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