Genes & Genetic Systems
Online ISSN : 1880-5779
Print ISSN : 1341-7568
ISSN-L : 1341-7568
Proceedings of Fukuoka International Symposium on Population Genetics
Mutational Origin of New Mating Type Specificities in Flowering Plants
Marcy K. Uyenoyama
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2000 Volume 75 Issue 6 Pages 305-311


Many hermaphroditic plants avoid self-fertilization by rejecting pollen that express genetically-determined specificities in common with the pistil. Self-incompatibility systems typically show extremely high genetic diversity, some maintaining hundreds of specificities. This article addresses the genetic and evolutionary mechanisms through which new mating specificities arise. Recent investigations of the genetic and physiological basis of self-incompatibility are reviewed. Two evolutionary pathways are considered: one which requires full expression of self-incompatibility in all intermediates and one in which new mating specificities arise through episodes of partial breakdown and restoration of self-incompatibility.

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© 2000 by The Genetics Society of Japan
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