A field guide to models of sex-ratio evolution in gynodioecious species
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منابع مشابه
Factors affecting relative seed fitness and female frequency in a gynodioecious species, Silene acaulis
Sex-ratio variation is common among gynodioecious species. One argument predicts that when sex is determined by a combination of nuclear and cytoplasmic factors, the frequency of females will be determined by genetic rather than ecological factors. An alternative argument suggests that the relative seed fitness of the female and hermaphroditic morphs will control female frequency. Hence, sex-ra...
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Gynodioecious plant species, which have populations consisting of female and hermaphrodite individuals, usually have complex sex determination involving cytoplasmic male sterility (CMS) alleles interacting with nuclear restorers of fertility. In response to recent evidence, we present a model of sex-ratio evolution in which restoration of male fertility is a threshold trait. We find that female...
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*In many gynodioecious plants, sex is determined by cytoplasmic male sterility genes (CMS) and nuclear male fertility restorers (Rf). Models predict that the costs of restoration are important determinants of population sex ratios. However, current approaches to the estimation of these costs require prior identification of CMS genotypes, information that is available for few species. *We tested...
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BACKGROUND AND AIMS Species that exhibit among-population variation in breeding system are particularly suitable to study the importance of the ecological context for the stability and evolution of gender polymorphism. Geographical variation in breeding system and sex ratio of Daphne laureola (Thymelaeaceae) was examined and their association with environmental conditions, plant and floral disp...
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In gynodioecious species, sex expression is generally determined through cytoplasmic male sterility genes interacting with nuclear restorers of the male function. With dominant restorers, there may be an excess of females in the progeny of self-fertilized compared with cross-fertilized hermaphrodites. Moreover, the effect of inbreeding on late stages of the life cycle remains poorly explored. H...
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