Genetic Analysis of Stripe Disease Resistance in Rice Restorer Line C224 Using Major Gene plus Polygene Mixed Effect Model

The inheritance of stripe disease resistance in a rice restorer line C224 was analyzed using the mixed effect model of major gene plus polygene for quantitative traits. In addition, the resistance was investigated in seven crosses of C224 with maintainer lines. The results showed that the stripe resistance of C224 was controlled by two major genes with additive-dominance-epistasis effects plus polygenes with additive-dominance effects (E-1 model). These two genes had additive effects of −12.47% and −24.75%, respectively, showing negative dominance effects. There were significant epistasis and interaction effects between the two major genes. The heritability of the two major genes was 92.12%, while that of polygenes was 2.74%, indicating that the stripe resistance had dominant major gene effect. Of the seven crosses, five displayed high or medium resistance to the stripe disease.