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- Title
A model for the evolution of high frequencies of males in an androdioecious plant based on a cross-compatibility advantage of males.
- Authors
Vassiliadis, Christine; Valero, Myriam; Saumitou-Laprade, Pierre; Godelle, Bernard
- Abstract
75) and phenotypic selection models for the maintenance of androdioecy predict that males (female-sterile individuals) must have an advantage in fertility (K) of at least two in order to invade a hermaphroditic population, and that their equilibrium frequency (xeq=(K - 2)/2(K - 1)) is always less than 0.5. In this paper, we develop a model in which male fertility is frequency-dependent, a situation not investigated in the previous models, to explore the conditions under which a high frequency of males (i.e. more than 50%) could be maintained at equilibrium. We demonstrate that a gametophytic self-incompatibility (GSI) locus linked to a nuclear sex determination locus can favour rare alleles through male function, by causing frequency-dependent selection. Thus, the spread of a female-sterility allele in a hermaphroditic population may be induced. In contrast with the previous models, our model can explain male frequencies greater than 50% in a functionally androdioecious species, as long as there is (i) dominance of female-sterility at the sex locus, and (ii) a few alleles at the self-incompatibility locus, even if the advantage in fertility of male phenotype is lower than two.
- Subjects
BIOLOGICAL evolution; REPRODUCTION; ANIMAL infertility; GENETICS; BIOLOGY
- Publication
Heredity, 2000, Vol 85, Issue 5, p413
- ISSN
0018-067X
- Publication type
Article
- DOI
10.1046/j.1365-2540.2000.00755.x