Factors related to suppression of leaf blast disease with a multiline of rice cultivar Sasanishiki and its isogenic lines.

The factors related to suppression of leaf blast disease with the mixture of the rice cultivar Sasanishiki and its isogenic lines were analyzed. The leaf blast disease severity in the mixture of the compatible and incompatible lines of Sasanishiki was less than in the compatible mixture. The blast disease severity in the mixture, where the plants were infected by an inoculated plant with virulent and avirulent isolates of blast fungus, was less than in the mixture having an inoculated plant with a virulent blast isolate. An induced resistance mechanism operated to depress the leaf blast disease in the multiline of Sasanishiki.