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Genetic and Pathogenic Diversity of the Rice Blast Pathogen

  • R. Sridhar
  • U. D. Singh
Chapter

Abstract

Rice blast caused by Pyricularia grisea (Rossman et al., 1990) (perfect state Magnaporthe grisea, Barr, 1977) continues to be a serious constraint to rice production in both tropical and temperate regions (Ou, 1980, 1985). Occurrence of blast was recorded for the first time in the Thanjavur delta of Tamil Nadu in 1918 (McRae, 1920). The disease has occurred from time to time in the country causing severe damage to rice production (Sundararaman, 1927; Thomas, 1930). Blast is common in all the three main ecosystems in which rice is grown namely, irrigated, and rainfed uplands and lowlands although the incidence and severity is greater in upland situations. The existence of strains of the blast pathogen Pyricularia grisea differing in pathogenicity was first noticed by Sasaki (1922). However, intensive studies on pathogenic races of this fungus was initiated in Japan only after some blast resistant cultivars such as Futaba, developed by hybridisation, became susceptible to this disease after cultivation for nearly a decade. Goto (1960, 1965) identified 13 races and placed them into three groups. Following this, studies on pathogenic races of P. grisea were intensified in several countries resulting in the identification of many races. However, the differentials used by different workers were not identical.

Keywords

Rice Blast Blast Resistance International Rice Research Institute Rice Blast Fungus Blast Resistance Gene 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 2001

Authors and Affiliations

  • R. Sridhar
    • 1
  • U. D. Singh
    • 1
  1. 1.Department of Plant pathology Central Rice Research InstituteMolecular Plant pathology LaboratoryOrissaIndia

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