Abstract

Blast disease, caused by Pyricularia grisea (Cooke) Sacc., is the most devastating disease of rice in Tohoku, a region located in the north-east of Honshu Island. To control blast disease in Japan, breeding programs generally develop varieties with partial (field or quantitative) resistance instead complete (true or qualitative) resistance, since the latter is likely to break down after a few years due to introgression (Watanabe, 1980). Before a resistant line can be recommended as a variety, breeders are normally required to submit information about its complete resistance genes as well as its partial resistance characteristics; in such cases, criterional varieties are indispensable. Because it has been more than 20 years since the establishment of criterional varieties for Tohoku, some of the varieties are no longer under commercial cultivation, whilst the partial resistance characteristics of others are not always acceptable to breeders. Therefore, the objectives of the present study were to construct a new series of criterional varieties for the evaluation of partial resistance to leaf and panicle blast in the Tohoku region.

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