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Gene-for-gene complementarity in plant-pathogen interactions.

N T Keen1

  • 1Department of Plant Pathology, University of California, Riverside 92521.

Annual Review of Genetics
|January 1, 1990
PubMed
Summary
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Cloning avirulence genes confirms the gene-for-gene model in plant-pathogen interactions. This research advances understanding of plant immune responses and disease resistance gene discovery.

Area of Science:

  • Plant pathology
  • Molecular biology
  • Genetics

Background:

  • Plant-pathogen specificity is crucial for disease development.
  • The gene-for-gene hypothesis describes interactions between plant resistance genes and pathogen avirulence genes.
  • Avirulence genes are key determinants of pathogen recognition by plants.

Purpose of the Study:

  • To elucidate the role of avirulence genes in plant-pathogen specificity.
  • To provide genetic and biochemical evidence for the elicitor-receptor model of plant-pathogen recognition.
  • To highlight the need for cloning and characterizing plant disease resistance genes.

Main Methods:

  • Cloning of avirulence genes from pathogens like Tobacco Mosaic Virus (TMV) and bacterial pathogens.
  • Genetic analysis to confirm the gene-for-gene relationship.

Related Experiment Videos

  • Biochemical studies to investigate elicitor-receptor interactions.

    • Main Results:

    • Confirmed the gene-for-gene relationship, demonstrating avirulence genes encode proteins interacting with plant resistance genes.
    • Provided insights into how specific avirulence genes (TMV coat gene, avrD) trigger the hypersensitive response (HR).
    • Established genetic and biochemical support for the elicitor-receptor model in plant-pathogen recognition.

    Conclusions:

    • Avirulence gene cloning has significantly advanced the understanding of plant-pathogen specificity and plant immune mechanisms.
    • Diverse pathogen elicitor structures suggest varied plant recognition strategies.
    • Further research on avirulence gene function and plant recognition mechanisms is essential, alongside the critical need to clone plant disease resistance genes for agricultural applications.