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A Cdc42 ortholog is required for penetration and virulence of Magnaporthe grisea

Wu Zheng1, Zhiying Zhao, Jisheng Chen

  • 1The Key Laboratory for Bio-pesticide and Chemistry Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou, PR China.

Fungal Genetics and Biology : FG & B
|March 21, 2009
PubMed

Insights

Magnaporthe grisea Cdc42 (MgCdc42) is essential for rice plant penetration and virulence. Deletion mutants exhibit defects in turgor, superoxide generation, and development, leading to reduced infectious growth.

Area of Science:

  • Molecular biology
  • Plant pathology
  • Mycology

Background:

  • Cdc42, a Rho-family GTPase, regulates actin cytoskeleton and cell polarity.
  • Understanding fungal virulence factors is crucial for disease management.

Purpose of the Study:

  • To investigate the role of MgCdc42 in the virulence of Magnaporthe grisea.
  • To elucidate the function of MgCdc42 in fungal development and plant infection.

Main Methods:

  • Gene deletion and dominant-negative mutation of MgCdc42 in M. grisea.
  • Phenotypic analysis of mutants, including virulence assays on rice.
  • Assessment of appressorial development, turgor, and superoxide generation.

Main Results:

  • MgCdc42 deletion mutants showed significantly reduced virulence on rice.
  • Mutants exhibited defects in penetration, infectious growth, conidia morphology, germination, and sporulation.
  • Turgor and superoxide generation during appressorial development were impaired in Mgcdc42 deletion mutants.

Conclusions:

  • MgCdc42 is indispensable for the plant penetration and virulence of Magnaporthe grisea.
  • MgCdc42 plays a critical role in appressorial development, turgor, and superoxide generation.
  • The findings highlight MgCdc42 as a potential target for controlling rice blast disease.

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