Blast Race Monitoring for Stable Use of Blast Resistance in Rice

  • Shinzo Koizumi


Differential systems of blast races based on the gene-for-gene relationship between host and pathogen were established in Japan by Yamada et al. (1976) and Kiyosawa (1984), and blast race monitoring was conducted nationwide in Japan in 1976, 1980, 1994, and 2001 using these systems. Those monitoring results showed that the frequencies of complete resistance genes in cultivated rice cultivars affected the prevalence of the corresponding avirulence genes in blast races, and such monitoring results have contributed to decisions regarding component proportions in three released Japanese multilines, as well as the development of rice cultivars with high levels of partial resistance. However, the optimal way for stable use of blast resistance in rice is not yet fully understood, because sufficiently quantitative analyses of blast race increases in host populations with different resistance genes, which are required to understand the optimal way, have not been conducted. For conducting the analyses, development of simple methods is necessary for monitoring blast races relative to resistance genotypes of the rice cultivars. These methods will facilitate accumulation of quantitative data on the increases of blast races in host populations with different resistance genes and such data will contribute to constructing reliable epidemiological simulation models to simulate blast race increases in the host populations.


Monitoring Blast races Rice Resistance Stable use 


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© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Shinzo Koizumi
    • 1
  1. 1.National Agricultural Research Center for Tohoku Region, Shimo-KuriyagawaMoriokaJapan

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