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The Red Queen Hypothesis and plant/pathogen interactions.

K Clay1, P X Kover

  • 1Department of Biology, Indiana University, Bloomington, Indiana 47405, USA.

Annual Review of Phytopathology
|January 1, 1996
PubMed
Summary
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The Red Queen Hypothesis (RQH) suggests parasites drive host sexual reproduction. While empirical evidence supports some RQH aspects in plant-pathogen interactions, gene-for-gene interactions present inconsistencies, leaving its overall validity for explaining sexual reproduction maintenance unresolved.

Area of Science:

  • Evolutionary Biology
  • Genetics
  • Plant Pathology

Background:

  • The Red Queen Hypothesis (RQH) proposes that host-pathogen interactions, specifically parasite specialization on common host genotypes, drive the maintenance of sexual reproduction in hosts.
  • This frequency-dependent selection model requires genotype-specific resistance and virulence for host and pathogen genotypes to dynamically influence each other.

Purpose of the Study:

  • To evaluate the empirical support for the Red Queen Hypothesis in explaining the persistence of sexual reproduction.
  • To assess the consistency of gene-for-gene interactions with the RQH's proposed mechanisms.

Main Methods:

  • Review of empirical evidence concerning the genetic basis of plant diseases.
  • Analysis of variation in host resistance and pathogen virulence.

Related Experiment Videos

  • Examination of infection patterns in sexual versus asexual plant populations.
  • Comparison of RQH predictions with gene-for-gene interaction models.

    • Main Results:

    • Empirical data on disease genetics, resistance/virulence variation, and infection patterns in plants provide partial support for the RQH.
    • Gene-for-gene interactions, characterized by matching allele mechanisms, generally do not align with the RQH's expectation of cycling gene frequencies.

    Conclusions:

    • The Red Queen Hypothesis offers valuable insights into plant-pathogen dynamics and agricultural pest management.
    • Current evidence is insufficient to definitively conclude whether the RQH fully explains the maintenance of sexual reproduction.
    • Further research is needed to reconcile gene-for-gene interactions with the RQH framework.