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Related Experiment Videos

Polymorphism at the self-incompatibility locus in Solanaceae predates speciation.

T R Ioerger1, A G Clark, T H Kao

  • 1Department of Molecular and Cell Biology, Pennsylvania State University, University Park 16802.

Proceedings of the National Academy of Sciences of the United States of America
|December 1, 1990
PubMed
Summary

Genetic analysis of the self-incompatibility locus (S locus) in Solanaceae species reveals ancient polymorphism predating species divergence. This suggests non-neutral evolution maintaining genetic diversity over long evolutionary timescales.

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Area of Science:

  • Plant genetics and evolution
  • Population genetics
  • Molecular biology

Background:

  • The gametophytic self-incompatibility (S locus) controls mating in many flowering plants.
  • Understanding the evolutionary history of S locus alleles is crucial for plant breeding and evolutionary studies.
  • Previous studies have focused on S locus diversity within single species.

Purpose of the Study:

  • To investigate the evolutionary relationships and patterns of polymorphism at the S locus across different Solanaceae species.
  • To determine if S locus polymorphism predates species divergence.
  • To explore the evolutionary forces maintaining S locus diversity.

Main Methods:

  • Sequencing of 11 S locus alleles from three Solanaceae species.

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  • Pairwise amino acid sequence comparisons to assess similarity.
  • Gene genealogy construction to infer evolutionary relationships.
  • Comparison of observed shared polymorphic sites with neutral evolution simulations.

    • Main Results:

    • Observed low intraspecific amino acid similarity (down to 40%) and higher interspecific similarities.
    • Gene genealogy indicated unusual relationships, with some interspecific similarities exceeding intraspecific ones.
    • The number of shared polymorphic sites exceeded simulations, suggesting ancient polymorphism maintenance.

    Conclusions:

    • A significant portion of S locus polymorphism likely predates the divergence of these Solanaceae species.
    • Strictly neutral evolution is unlikely to explain the long-term maintenance of this polymorphism.
    • The findings support population genetic models of gametophytic self-incompatibility and suggest parallels with mammalian MHC.