Abstract
A negative pleiotropic effect on fitness of nuclear sex-determining genes (cost of restoration) could explain nuclear-cytoplasmic gynodioecy but rarely has been demonstrated empirically. In a gynodioecious Phacelia dubia population, maternal lineages produce only hermaphroditic progenies irrespective of the pollen parent (N) or can segregate females (S). Natural progenies of N maternal plants had lower seed viability than that of S. Full-sib progenies of unrelated hermaphrodites from all possible matings between N and S lineages had similar pollen filling but differed in sporophyte performance, mainly at seed germination stage. A discrete multivariate analysis reveals that the performance of N♀ × S♂ progeny at early stages of development was significantly lower than that of the other three types of mating in agreement with the silent-cost-of-restoration hypothesis, affecting the sporophyte. The restoration cost and male sterility appear to be dominant and consequence of nuclear-cytoplasmic incompatibilities that may maintain nuclear-cytoplasmic polymorphism by frequency-dependent selection.
Original language | English |
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Pages (from-to) | 306-313 |
Number of pages | 8 |
Journal | Journal of Evolutionary Biology |
Volume | 22 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2009 |
Keywords
- Cost of restoration
- Discrete multivariate analysis
- Fitness
- Gynodioecy
- Hybridization
- Male sterility
- Nuclear-cytoplasmic incompatibilities
- Phacelia dubia
- Seed viability