Pyramiding resistance genes to leaf blast in rice through F1 hybrid
1987
Suh, H.S. (Yeongnam Univ., Kyongsan (Korea R.). Coll. of Agriculture and Animal Science) | Heu, M.H. (Seoul National Univ., Suwon (Korea R.). Dept. of Agronomy) | Nuque, F.L. (International Rice Research Inst., Manila (Philippines). Plant Pathology Dept.)
Three F1 hybrids, Seokwang/Milyang 54, HR1619-6-2-1-2-2/Milyang 54 and 55061/IR19735-5-2-3-2-1, and their parents were inoculated with each of four individual blast races, IC-13, IH-1, IA-61 and IB-47, and the mixtures of two races, IC-13 and IH-1, IC-13 and IA-61, and IC-13 and IB-47, respectively. The varietal reactions to the tested races showed that two parental varieies of each cross, Seokwang and Milyang 54, HR1619-6-2-1-2-2 and Milyang 54, and 55061 and IR19735-5-2-3-2-1 have different resistance gene(s) respectively. The F1 hybrids between two cultivars having different resistant genes were resistant to the mixture of two races of which one race was virulent to one parent and avirulent to the other parent respectively, while the parents of these F1s were suscept1999ible. This may suggest that the F1 hybrids have wider spectrum resistance to leaf blast than their par
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