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Stability of self-incompatibility systems.

O Mayo1, C R Leach

  • 1Biometry Section, Waite Agricultural Research Institute, The University of Adelaide, Adelaide, Australia.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|November 19, 2013
PubMed
Summary
This summary is machine-generated.

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.

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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.