Effects of Adult-Plant Resistance on Blast Severity and Yield of Rice

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Abstract
Adult-plant resistance is defined as resistance that is expressed as the plant matures. Field studies were performed in flooded plots in 1984 and 1985 to evaluate various degrees of adult-plant resistance to leaf and panicle blast [Pyricularia oryzae] and to determine the relationship of such resistance to rice yield. The rice cultivars showing adult-plant resistance to leaf blast were effectively protected from leaf blast under flooded conditions. Cultivars with high quantitative levels of adult-plant resistance to leaf blast showed higher resistance to both leaf and panicle blast. Reduction of yield by blast was less in the adult-plant-resistant cultivars than in susceptible cultivars. The cultivar Dobong, which was highly resistant to both leaf and panicle blast, showed as stable a yield potential as Nongbaek, which has a hypersensitive type of resistance to blast.

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