Stability of self-incompatibility systems
1Biometry Section, Waite Agricultural Research Institute, The University of Adelaide, Adelaide, Australia.
Summary
Multi-locus self-incompatibility systems can evolve into single-gene systems. This genetic structure, seen in Nicotiana, resists disruption unless selfing genes emerge, which then quickly dominate.
Area of Science:
- Plant reproductive biology
- Evolutionary genetics
Background:
- Multi-locus self-incompatibility (SI) systems in plants are common but their adaptive advantages are not always clear.
- Gametophytic SI involves multiple genes, but their independent action can influence evolutionary trajectories.
Purpose of the Study:
- To investigate the evolutionary dynamics of gametophytic self-incompatibility systems.
- To understand how selection pressures can alter multi-locus SI systems.
Main Methods:
- Theoretical modeling of gene action within gametophytic SI systems.
- Analysis of allele fixation probabilities under selective advantage.
Main Results:
- Independent gene action in two-gene gametophytic SI systems allows individual genes to act without systematic disruption of panmixia.
- Selective advantage of an allele can lead to its rapid fixation, simplifying the SI system.
- The resulting single-gene SI system (e.g., in Nicotiana) becomes stable against disruption.
Conclusions:
- Gametophytic SI systems can evolve towards simpler, single-gene systems under specific selective pressures.
- The fixation of alleles in SI systems is influenced by their individual selective advantages.
- Selfing genes represent a significant disruptive force, leading to rapid fixation in established SI systems.
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