title: Why are there so few homomorphic multi-locus sporophytically determined self-incompatibility systems?
abstract: Homomorphic multi-locus sporophytically determined self-incompatibility systems are much rarer than multi-locus gametophytic systems. This note examines some of the possible reasons for this disparity and concludes that, while each additional locus in a gametophytic system allows increased crossing among related plants as well as a lower mutation rate to maintain a given level of variability, the same conclusion cannot be drawn for sporophytic systems.
authors.affiliation: CSIRO Division of Animal Production, PO Box 239, 2148, Blacktown, NSW, Australia.
authors.forename: O
authors.initials: O
authors.lastname: Mayo
authors.forename: C R
authors.initials: CR
authors.lastname: Leach