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The genetics of host-pathogen coevolution: implications for genetic resource conservation.

R W Allard1

  • 1Department of Genetics and Department of Agronomy and Range Science, University of California, Davis, 95616.

The Journal of Heredity
|January 1, 1990
PubMed
Summary

Long-term studies reveal that barley (Hordeum vulgare) and its pathogen Rhynchosporium secalis coevolve through gene-for-gene interactions. Cultivated barley populations effectively increase beneficial resistance alleles and genotypes for disease resistance breeding.

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Area of Science:

  • Plant pathology
  • Evolutionary biology
  • Genetics

Background:

  • The Hordeum vulgare-Rhynchosporium secalis pathosystem exhibits complex coevolutionary dynamics.
  • Gene-for-gene interactions are central, influencing host-pathogen population adjustments over generations.

Purpose of the Study:

  • To summarize long-term coevolutionary study results in the barley-Rhynchosporium secalis pathosystem.
  • To analyze the impact of genetic systems and selection pressures on host resistance evolution.

Main Methods:

  • Long-term population studies of barley (Hordeum vulgare) and its pathogen Rhynchosporium secalis.
  • Analysis of gene-for-gene interactions and their effects on host and pathogen traits.
  • Monitoring of resistance allele frequencies under cultivation conditions.

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Main Results:

  • Complementary genetic systems and gene-for-gene interactions drive coevolution.
  • Significant variation exists in pathogen virulence and host resistance efficacy.
  • Some barley resistance loci provided stable resistance, while others had detrimental effects on host fitness.
  • Resistance alleles effective against damaging pathotypes increased in frequency.

Conclusions:

  • Evolutionary processes in cultivated, genetically variable populations are effective in increasing desirable alleles and genotypes.
  • These evolving populations serve as valuable genetic resources for breeding disease resistance in barley.
  • Understanding coevolution enhances strategies for developing durable disease resistance in crops.