Autophagic fungal cell death is necessary for infection by the rice blast fungus

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Single Cell Measurements of Vacuolar Rupture Caused by Intracellular Pathogens
10:39

Single Cell Measurements of Vacuolar Rupture Caused by Intracellular Pathogens

Published on: June 12, 2013

Claire Veneault-Fourrey1, Madhumita Barooah, Martin Egan

  • 1School of Biosciences, University of Exeter, Washington Singer Laboratories, Perry Road, Exeter EX4 4QG, UK.

Science (New York, N.Y.)
|April 29, 2006
PubMed

Insights

Rice blast fungus Magnaporthe grisea requires conidial cell death for infection. Autophagy, specifically the MgATG8 gene, is essential for this process, making the fungus nonpathogenic when impaired.

Area of Science:

  • Plant Pathology
  • Mycology
  • Molecular Biology

Background:

  • Rice blast, caused by Magnaporthe grisea, is a major threat to global rice production.
  • Fungal pathogens utilize specialized structures like appressoria for host penetration.

Purpose of the Study:

  • To elucidate the molecular mechanisms and developmental requirements for appressorium formation in Magnaporthe grisea.
  • To investigate the role of autophagy in the pathogenicity of the rice blast fungus.

Main Methods:

  • Genetic manipulation, including targeted mutation of the MgATG8 gene.
  • Microscopic observation of fungal development and infection processes.
  • Analysis of mitosis, nuclear migration, and conidial cell death.

Main Results:

  • Appressorium formation is a sequential process requiring mitosis completion, nuclear migration, and conidial death.
  • Genetic disruption of mitosis inhibits both appressorium development and conidial death.
  • Mutation of the MgATG8 gene halts conidial cell death and results in a nonpathogenic fungus.

Conclusions:

  • Autophagic cell death of the conidium is a critical, required step for initiating rice blast infection.
  • The MgATG8 gene and the autophagy pathway are essential for Magnaporthe grisea pathogenicity.

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