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Mnh6, a nonhistone protein, is required for fungal development and pathogenicity of Magnaporthe grisea

Jian-Ping Lu1, Xiao-Xiao Feng, Xiao-Hong Liu

  • 1Biotechnology Institute, Zhejiang University, Kaixuan Road 268, Hangzhou 310029, China.

Fungal Genetics and Biology : FG & B
|July 24, 2007
PubMed

Insights

The Mnh6 protein is crucial for the rice blast fungus, Magnaporthe grisea, to cause disease. Deleting Mnh6 severely impairs fungal growth, development, and pathogenicity on rice and barley.

Area of Science:

  • Plant Pathology
  • Mycology
  • Molecular Biology

Background:

  • Magnaporthe grisea is a significant fungal pathogen causing rice blast disease.
  • Nonhistone proteins, such as Mnh6 with an HMG1 box, play roles in fungal development and pathogenicity.

Purpose of the Study:

  • To investigate the function of the Mnh6 protein in the disease cycle of Magnaporthe grisea.
  • To elucidate the role of Mnh6 in fungal morphogenesis and pathogenicity.

Main Methods:

  • Generation and analysis of an MNH6-deletion mutant (Deltamnh6) in M. grisea.
  • Comparative studies of wild-type and Deltamnh6 mutant for growth, development, and pathogenicity.
  • Complementation of the Deltamnh6 mutant by reintroducing MNH6.

Main Results:

  • The Deltamnh6 mutant showed reduced mycelial growth, conidiation, and appressorium development.
  • Impaired plant penetration and reduced infectious growth in host cells were observed in the Deltamnh6 mutant.
  • Pathogenicity on barley and rice was significantly reduced in the Deltamnh6 mutant, with restoration upon MNH6 reintroduction.

Conclusions:

  • Mnh6 is essential for normal fungal morphogenesis in M. grisea.
  • Mnh6 plays a critical role in the pathogenicity and disease cycle completion of M. grisea.
  • The study confirms Mnh6's requirement for effective infection and disease development.

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