Journal article
The evolution of dominance in sporophytic self-incompatibility systems. II. Mate availability and recombination
Evolution, Vol.63(8), pp.2099-2113
08/2009
Handle:
https://hdl.handle.net/2376/104182
PMID: 19453382
Abstract
Sporophytic self-incompatibility (SSI) is a self-pollen recognition system that enforces outcrossing in plants. Recognition in SSI systems is typically controlled by a complex locus (S-locus) with separate genes that determine pollen and stigma specificity. Experimental studies show that S-alleles can be dominant, recessive, or codominant, and that the dominance level of a given S-allele can depend upon whether pollen or stigma specificity is examined. Here and in the companion paper by Llaurens and colleagues, the evolution of dominance in single-locus SSI is explored using numerical models and simulation. Particular attention is directed at factors that can cause S-allele dominance to differ in pollen versus stigma. The effect of recombination between the S-locus and modifier locus is also examined. The models predict that limitation in the number of compatible mates is required for the evolution of S-allele dominance in the stigma but not in the pollen. Tight linkage between the S-locus and modifier promotes the evolution of S-allele dominance hierarchies. Model results are interpreted with respect to published information on the molecular basis of dominance in SSI systems, and reported S-allele dominance relationships in a variety of species. These studies show that dominant S-alleles are more common in the pollen than in the stigma, a pattern that when interpreted in light of model predictions, suggests that mate limitation may be relatively infrequent in natural populations with SSI.
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Details
- Title
- The evolution of dominance in sporophytic self-incompatibility systems. II. Mate availability and recombination
- Creators
- Daniel J Schoen - Department of Biology, McGill University, Montreal Québec, Canada. daniel.schoen@mcgill.caJeremiah W Busch
- Publication Details
- Evolution, Vol.63(8), pp.2099-2113
- Academic Unit
- Biological Sciences, School of
- Publisher
- United States
- Identifiers
- 99900546943601842
- Language
- English
- Resource Type
- Journal article