Inheritance of leaf blast resistance in two crosses of upland rice (Oryza sativa)
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Authors
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J. S. CHAUHAN, M. VARIAR, D. MAITI and V.D. SHUKLA
Central Rainfed Upland Rice Research Station, Post Box 48, Hazaribag 825 301
Keywords:
Genetics, leaf blast, Pyricularia grisea, upland riceAbstract
The parental, F2 and F3 generations of 2 inter varietal crosses of upland rice: Annada X Prasanna and BG 367-4 X RR 149-177 were evaluated for leaf blast (Pyricularia [Magnaporthe] grisea) resistance. Segregation patterns indicated the presence of non-allelic interactions in the inheritance of this trait. Additive and dominance effects were both significant but dominance effects were larger and predominant. Resistance and moderate resistance were found to be highly heritable. The presence of large dominance gene effects limited the effectiveness of early generation selection in both these crosses.
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