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Related Experiment Videos

Bacterial avirulence genes.

J E Leach1, F F White

  • 1Department of Plant Pathology, Kansas State University, Manhattan, Kansas 66506-5502, USA. JELEACH@KSU.KSU.EDU

Annual Review of Phytopathology
|January 1, 1996
PubMed
Summary
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Bacterial avirulence genes, like avrD in Pseudomonas syringae, may produce enzymes that trigger plant resistance. Understanding these plant-pathogen interactions could reveal how resistance is induced.

Area of Science:

  • Plant pathology
  • Microbial genetics
  • Molecular biology

Background:

  • Over 30 bacterial avirulence genes are known, but their functions remain largely uncharacterized.
  • The product of the avrD gene in Pseudomonas syringae pv. glycinea is a potential exception, possibly acting as an enzyme.
  • Avirulence gene function often depends on interactions with hypersensitive response and pathogenicity (hrp) genes.

Purpose of the Study:

  • To investigate the function of bacterial avirulence genes in plant resistance.
  • To explore the role of the avrD gene product in soybean resistance.
  • To understand the relationship between avirulence genes and hrp genes in plant-pathogen interactions.

Main Methods:

  • Gene cloning and characterization of bacterial avirulence genes.

Related Experiment Videos

  • Biochemical analysis to determine the enzymatic activity of avrD gene product.
  • Comparative genomics to study similarities between plant and mammalian pathogen genes.

    • Main Results:

    • Evidence suggests the avrD gene product functions indirectly by producing elicitors.
    • The avrD gene product is likely an enzyme involved in elicitor synthesis.
    • Many hrp genes share similarities with genes involved in pathogenicity factor delivery in mammalian pathogens.

    Conclusions:

    • The avrD gene product's enzymatic activity is crucial for eliciting soybean resistance.
    • Understanding hrp gene functions may provide insights into avirulence gene mechanisms.
    • Analogies between plant and mammalian pathogens can aid in elucidating resistance induction pathways.