Abstract
The rice cultivar Chubu 32 has high partial resistance to leaf blast caused by Pyricularia grisea. We developed a way to evaluate its partial resistance in individual rice plants in the greenhouse. Cultivars Koshihikari and Norin29, whose levels of partial resistance were low, were used in this study. Seedlings were grown in a greenhouse with high levels of nitrogen application and inoculated at the 8th leaf stage by spraying with a spore suspension (2×105/ml) of the blast fungus conidia.The percentage of diseased leaf area of the 8th leaf stage of each plant was assessed 7 days after inoculation. We were thus able to individually discriminate the resistance of Chubu 32 compared to that shown by less resistant cultivars.
