Abstract
The view put forward by some authors that flowering plant self-incompatibility mechanisms of the homomorphic sporophytic and heteromorphic sporophytic types have a close evolutionary relationship, with one form being evolved from the other, or both forms directly evolved from ancestors with homomorphic gametophytic incompatibility, is challenged. A review is provided of the various facets of each of the three main self-incompatibility systems, including a detailed summary of our current knowledge of the rejection mechanism, to demonstrate that the implicit assumption that these systems have a common S locus, and also evolutionary theories linking the systems, need to be treated with considerable caution.
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Gibbs, P.E. Do homomorphic and heteromorphic self-incompatibility systems have the same sporophytic mechanism?. Pl Syst Evol 154, 285–323 (1986). https://doi.org/10.1007/BF00990130
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DOI: https://doi.org/10.1007/BF00990130