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Identification and characterization of the peroxin 1 gene MoPEX1 required for infection-related morphogenesis and

Shuzhen Deng1, Zhuokan Gu2, Nan Yang1

  • 1State Key Laboratory for Rice Biology, Institute of Biotechnology, Zhejiang University, Hangzhou, 310029, China.

Scientific Reports
|November 9, 2016
PubMed

Insights

Magnaporthe oryzae requires the MoPEX1 gene for pathogenicity. Deleting MoPEX1 impairs fungal growth, appressorium formation, and fatty acid utilization, crucial for plant infection.

Area of Science:

  • Fungal Molecular Biology
  • Plant Pathology
  • Cell Biology

Background:

  • Peroxisomes are vital for pathogenicity in many fungi.
  • The precise link between peroxisomal function and fungal pathogenicity remains unclear.
  • Magnaporthe oryzae is a significant fungal pathogen of rice.

Purpose of the Study:

  • To investigate the role of the MoPEX1 gene in Magnaporthe oryzae.
  • To elucidate the function of MoPEX1 in fungal pathogenicity and peroxisomal processes.

Main Methods:

  • T-DNA insertional mutagenesis and gene deletion in Magnaporthe oryzae.
  • Analysis of fungal growth, conidiation, and appressorium formation.
  • Fatty acid utilization assays, lipid droplet analysis, protein localization studies (GFP/RFP fusions), and yeast two-hybrid assays.

Main Results:

  • MoPEX1 deletion mutants (ΔMopex1) were nonpathogenic and exhibited defects in growth, conidiation, and appressorium development.
  • ΔMopex1 mutants showed impaired fatty acid utilization and lipid droplet mobilization during appressorium formation.
  • MoPex1 is essential for peroxisomal matrix protein import and localizes to peroxisomes.
  • MoPex1 interacts with MoPex6, a known pathogenicity factor.

Conclusions:

  • MoPEX1 is critical for peroxisomal function in Magnaporthe oryzae.
  • MoPEX1 is required for infection-related morphogenesis and pathogenicity, likely through its role in peroxisomal processes and protein import.

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