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Molecular Biology and Evolution 19:825-829 (2002)
© 2002 Society for Molecular Biology and Evolution

S-RNase–mediated Gametophytic Self-Incompatibility is Ancestral in Eudicots

J. E. Steinbachs1 and K. E. Holsinger

*The Field Museum, Department of Zoology, Chicago;
{dagger}Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs

The evolutionary relationship between self-incompatibility systems in different families of flowering plants has long been a topic of interest. Physiological differences in the mode of gene action and the enormous sequence differences between genes with different modes of action suggest that many instances of self-incompatibility have arisen independently. In contrast, previous analyses of the S-RNase associated with gametophytic self-incompatibility in the eudicot families (Solanaceae, Scrophulariaceae, and Rosaceae) have suggested that sequences within families form well-supported and distinct lineages. In this study we demonstrate that in fact, S-RNase–mediated gametophytic self-incompatibility evolved only once in the eudicots.


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