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A fungal metallothionein is required for pathogenicity of Magnaporthe grisea

Sara L Tucker1, Christopher R Thornton, Karen Tasker

  • 1School of Biological Sciences, University of Exeter, Washington Singer Laboratories, Exeter EX4 4QG, United Kingdom.

The Plant Cell
|May 25, 2004
PubMed

Insights

A novel gene, Magnaporthe metallothionein 1 (MMT1), is crucial for rice blast fungus virulence. Disruption of MMT1 prevents appressoria from penetrating rice cuticles, highlighting its role in fungal infection.

Area of Science:

  • Plant Pathology
  • Mycology
  • Molecular Biology

Background:

  • Rice blast disease, caused by Magnaporthe grisea, is a major threat to rice production.
  • Fungal infection relies on specialized structures like appressoria to penetrate the plant cuticle.

Purpose of the Study:

  • To identify genes involved in the virulence of Magnaporthe grisea.
  • To investigate the function of a newly identified gene, Magnaporthe metallothionein 1 (MMT1), in fungal pathogenicity.

Main Methods:

  • Gene identification and characterization of MMT1 in M. grisea.
  • Creation of MMT1 gene disruption mutants.
  • Phenotypic analysis of mutants, including growth, sporulation, metal tolerance, and plant infection assays.

Main Results:

  • MMT1 encodes a small, zinc-binding metallothionein-like protein with antioxidant properties.
  • MMT1 mutants exhibited accelerated hyphal growth and reduced sporulation but normal metal tolerance.
  • MMT1 mutants were non-pathogenic, unable to penetrate the rice plant cuticle via appressoria.

Conclusions:

  • MMT1 is essential for the virulence of M. grisea, specifically for appressorium-mediated cuticle penetration.
  • The MMT1 protein likely plays a role in fungal cell wall biochemistry, distinct from metal tolerance or general antioxidant functions.
  • Mmt1-like metallothioneins may represent a novel target for controlling rice blast disease.

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