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Related Experiment Videos

Disease, frequency-dependent selection, and genetic polymorphisms: experiments with stripe rust and wheat.

J Brunet1, C C Mundt

  • 1Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331-2902, USA. brunetj@bcc.orst.edu

Evolution; International Journal of Organic Evolution
|August 11, 2000
PubMed
Summary

Pathogen attacks can create frequency-dependent selection, favoring rare host genotypes. However, this study found disease-induced selection was insufficient to maintain wheat genetic diversity, unlike other factors.

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Area of Science:

  • Plant pathology
  • Population genetics
  • Evolutionary biology

Background:

  • Pathogens can drive host genetic diversity through frequency-dependent selection.
  • Negative frequency-dependent selection occurs when rare host genotypes have higher fitness.
  • This study investigates disease-induced frequency-dependent selection in wheat populations.

Purpose of the Study:

  • To determine if Puccinia striiformis (wheat stem rust) creates frequency-dependent selection on wheat genotypes.
  • To assess if this selection can maintain polymorphisms for resistance genes in wheat.
  • To differentiate disease-driven selection from other frequency-dependent selection factors.

Main Methods:

  • Utilized wheat genotypes with varying susceptibility to Puccinia striiformis races.

Related Experiment Videos

  • Planted four two-way mixtures of wheat genotypes at different frequencies.
  • Experiment conducted in both the presence and absence of disease.

    • Main Results:

    • Disease induced frequency-dependent selection in some wheat populations.
    • Non-disease factors also caused frequency-dependent selection, with rare genotype advantage observed even without disease.
    • Pathogen-induced selection was insufficient to maintain genetic polymorphism in host populations.
    • When frequency-dependent selection was solely disease-driven, one genotype was predicted to dominate regardless of disease presence.
    • Evidence for maintaining genetic polymorphisms emerged only when frequency-dependent selection was not disease-related.

    Conclusions:

    • Direct, frequency-dependent selection by pathogens, stemming from epidemiological effects, does not appear sufficient to maintain genetic polymorphisms in wheat.
    • Other, non-disease-related factors play a crucial role in maintaining genetic diversity in host populations.
    • The findings differentiate direct frequency-dependent selection from time-lagged frequency-dependent selection observed in host-parasite coevolution.