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Related Experiment Videos

Oxalate, germins, and higher-plant pathogens.

Byron G Lane1

  • 1Biochemistry Department, Faculty of Medicine, University of Toronto, Ontario, Canada. byron.lane@utoronto.ca

IUBMB Life
|June 7, 2002
PubMed
Summary

Plant oxalate oxidases (OXOs) from cereals enhance disease resistance in dicotyledons. Transferring wheat germin OXO (G-OXO) genes boosts plant defense against fungal pathogens by generating hydrogen peroxide and strengthening cell walls.

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Area of Science:

  • Plant pathology
  • Biochemistry
  • Molecular biology

Background:

  • Oxalate oxidases (OXOs), also known as germin OXOs (G-OXOs), are enzymes found in true cereals.
  • These enzymes play a role in cereal defense against fungal pathogens.
  • G-OXOs exhibit unique stability and structural properties.

Purpose of the Study:

  • To investigate the potential of G-OXOs as agents of plant defense in dicotyledonous plants.
  • To explore the mechanisms by which G-OXOs confer resistance to fungal pathogens.

Main Methods:

  • Transferring the wheat G-OXO coding element into dicotyledonous plants.
  • Evaluating the resistance of transgenic plants to fungal pathogens.
  • Analyzing the biochemical and cellular responses associated with G-OXO activity.

Main Results:

  • Transfer of wheat G-OXO genes resulted in improved resistance to fungal pathogens in dicotyledons.
  • G-OXOs generate microcidal hydrogen peroxide concentrations upon acting on oxalate.
  • Hydrogen peroxide production mediates lignification of cell walls, forming barriers against pathogens.

Conclusions:

  • G-OXOs are promising agents for enhancing plant defense in dicotyledons.
  • The mechanism of resistance involves hydrogen peroxide generation, hypersensitive cell death, and cell wall reinforcement.
  • G-OXOs counteract oxalate, a fungal toxin and inhibitor of plant defense responses.

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