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- Title
Sexual dimorphism and the genetic potential for evolution of sex allocation in the gynodioecious plant, Schiedea salicaria.
- Authors
SAKAI, A. K.; WELLER, S. G.; CULLEY, T. M.; CAMPBELL, D. R.; DUNBAR-WALLIS, A. K.; ANDRES, A.
- Abstract
Sex allocation theory addresses how separate sexes can evolve from hermaphroditism but little is known about the genetic potential for shifts in sex allocation in flowering plants. We tested assumptions of this theory using the common currency of biomass and measurements of narrow-sense heritabilities and genetic correlations in Schiedea salicaria, a gynodioecious species under selection for greater differentiation of the sexes. Female (carpel) biomass showed heritable variation in both sexes. Male (stamen) biomass in hermaphrodites also had significant heritability, suggesting the potential for further evolution of dioecy. Significant positive genetic correlations between females and hermaphrodites in carpel mass may slow differentiation between the sexes. Within hermaphrodites, there were no negative genetic correlations between male and female biomass as assumed by models for the evolution of dioecy, suggesting that S. salicaria is capable of further changes in biomass allocation to male and female functions and evolution toward dioecy.
- Subjects
SEXUAL dimorphism in animals; ANIMAL genetics; SEX in plants; SEX allocation; SCHIEDEA; INTERSEXUALITY; BIOLOGICAL evolution
- Publication
Journal of Evolutionary Biology, 2008, Vol 21, Issue 1, p18
- ISSN
1010-061X
- Publication type
Article
- DOI
10.1111/j.1420-9101.2007.01439.x