Rice blast control with multilines in Japan
2001
Koizumi, S.
The current situation of rice blast control with multilines and its studies in Japan are summarized for durable and effective control of the disease. From 15 different recurrent rice cultivars, near-isogenic lines with different genes with complete resistance to blast have been developed or are being developed to control the disease in Japan. One group of these, the Sasanishiki multilines, has been registered and cultivated in northern Japan. Mechanisms of blast reduction in multilines are also discussed. A reduction in susceptible plants, the barrier effect of resistant plants, and induced resistances are considered to contribute to blast reduction in multilines and cultivar mixtures. The effectiveness of the Sasanishiki multilines for blast control and the changes in blast races in them were investigated. Results indicated that an increase in the number of components and proportion of resistant components is necessary for effective blast control with multilines. Since available genes with complete res stance to blast are limited in Japan, multilines with high levels of partial resistance are required.
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