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Common genetic pathways regulate organ-specific infection-related development in the rice blast fungus

Sara L Tucker1, Maria I Besi, Rita Galhano

  • 1Department of Disease and Stress Biology, John Ines Centre, Norwich NR4 7UH, United Kingdom.

The Plant Cell
|March 30, 2010
PubMed

Insights

Magnaporthe oryzae develops preinvasive hyphae (pre-IH) on rice roots, essential for infection. The PMK1 pathway and exportin-5 are crucial for this fungal development and pathogenicity.

Area of Science:

  • Plant Pathology
  • Mycology
  • Molecular Biology

Background:

  • Magnaporthe oryzae is a major fungal pathogen affecting rice (Oryza sativa).
  • This pathogen employs diverse mechanisms to colonize both aerial and underground plant organs.

Purpose of the Study:

  • To characterize infection-related development in M. oryzae on artificial surfaces and rice roots.
  • To identify genetic factors regulating preinvasive hyphae (pre-IH) formation and pathogenicity.

Main Methods:

  • Developmental analysis of M. oryzae on hydrophilic polystyrene (PHIL-PS) and rice roots.
  • Utilizing insertional mutagenesis to identify mutants with altered pre-IH differentiation.
  • Phenotypic analysis of mutants, including those affecting the PMK1 pathway and exportin-5 (EXP5).

Main Results:

  • M. oryzae forms preinvasive hyphae (pre-IH) from hyphopodia or germ tubes on both artificial and root surfaces, with altered cell wall structures.
  • The PMK1 pathway is essential for pre-IH development.
  • Twenty mutants defective in pre-IH differentiation were identified, revealing a genetic link between appressorium, hyphopodium, and pre-IH formation.
  • A mutant lacking exportin-5 (EXP5) showed significantly reduced virulence on rice roots.

Conclusions:

  • Preinvasive hyphae (pre-IH) formation is a critical, genetically regulated developmental process in M. oryzae infection.
  • The PMK1 pathway and exportin-5 (EXP5) play vital roles in M. oryzae pathogenicity, particularly during root colonization.

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