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Related Experiment Videos

The evolutionary dynamics of self-incompatibility systems.

Ed Newbigin1, Marcy K Uyenoyama

  • 1School of Botany, University of Melbourne, Victoria 3010, Australia.

Trends in Genetics : TIG
|July 19, 2005
PubMed
Summary

Flowering plants use self-incompatibility to prevent self-pollination. A new model suggests selection favors the rejecting partner, accelerating genetic changes and the evolution of new S-locus specificities.

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Area of Science:

  • Plant reproductive biology
  • Evolutionary genetics
  • Molecular evolution

Background:

  • Self-incompatibility (SI) systems prevent self-fertilization in flowering plants.
  • SI relies on specific recognition between pollen and pistil (female reproductive organs).
  • In some SI systems, pollen and pistil genes controlling specificity are tightly linked within the S locus.

Purpose of the Study:

  • To model the evolutionary processes generating new S-locus specificities.
  • To investigate how selection acts on genes within the S locus.
  • To understand the role of nonreciprocal siring success in SI evolution.

Main Methods:

  • Development of a graphical model for hypothesis generation.
  • Incorporation of evolutionary principles, specifically nonreciprocal siring success.

Related Experiment Videos

  • Analysis of selection pressures acting on S-allele specificity classes.

    • Main Results:

    • The model suggests selection within S-allele specificity classes accelerates amino acid substitutions.
    • Periodic selective sweeps are predicted to remove variation within these classes.
    • Accelerated substitution rates may promote the emergence of novel S-locus specificities.

    Conclusions:

    • Selection acting on the rejecting partner in SI systems can drive rapid genetic change.
    • This process can lead to the diversification of S-locus specificities.
    • The model provides a framework for understanding the evolution of plant reproductive isolation.