Molecular Aspects of Host-Pathogen Interactions in the Rice-Blast System

  • T. Bhargava
  • J. E. Hamer


Rice blast disease, caused by the haploid filamentous fungus Magnaporthe grisea (Hebert) Barr (Barr, 1977), is the single most devastating disease of cultivated rice (Oryza sativa) worldwide. M. grisea, a heterothallic Ascomycete, is also phytopathogenic to more than fifty Graminaceous species. These include forage grasses and economically important cereal crops like wheat, barley, maize and fingermillet. Although the organism as a whole infects many different species of grasses, individual isolates have a more restricted host range. The rice blast fungus invades the above ground parts of the rice plant and in severe epidemics, large ellipsoid lesions can engulf the entire leaf surface. After the flowering stage of the plant, the fungus spreads into the panicle (the inflorescence that holds the rice grains), causing neck blast that can devastate an entire crop (Talbot, 1995). The fungus can also invade the nodes of the plant, turning them black and making the stem fragile enough to break (Ou, 1980).


Salicylic Acid Jasmonic Acid Rice Blast Plant Molecular Biology Appressorium Formation 
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Copyright information

© Springer Science+Business Media Dordrecht 2001

Authors and Affiliations

  • T. Bhargava
    • 1
  • J. E. Hamer
    • 1
  1. 1.Department of Biological SciencesPurdue UniversityWest LafayetteUSA

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