The heritability and combining ability of blast resistance, the number of effective panicles, amylosecontent and gelatinization etc. were studied by means of diallel analysis in ten rice cultivars with blast resistanceand/or good quality. The results show that blast resistance, amylose content and gelatinization are mainly controlled by additive gene effect. The number of tillers per plant, the number of panicles per plant, the length of panicle and plant height are controlled by both additive and non additive effect. Waixuan 35 is a cultivar with good resistance to blast, good shape of grains and strong combining ability and heritability of resistance but not good for gelatinization and amylose content. In our results we found another cultivar Erbazhan which combined resistance andtraits of good quality very well. The good effects of the general combining ability in Erbazhan are significant andvery significant at both of resistance and quality. Erbazhan may be used as a new source of resistance material.Meanwhile, when we use Erbazhan as a parent in the rice breeding program of resistance and good quality and highyield, it is better to select another parent that have negative general combining ability in plant height and big variance in general combining ability effect in order to improve the resistance to lodging.
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