Variation in some quantitative characters in doubled haploid lines derived from a heterotic rice hybrid
1996
Bong, B.B. | Swaminathan, M.S.
The hybrid derived from Pusa 743-1-1/IR66 showed significant heterosis for grain yield. Forty-six different doubled haploied (DH) lines were obtained through anther culture of this hybrid. The variation in some quantitative characters within DH lines, F5 lines derived from the same cross, and conventional (inbred) varieties was examined. The performance of the DH lines was compared with that of the corresponding hybrid, parents, and F2 plants. The results showed that the coefficient of variation in plant height, panicle number plant1, panicle length, grain number panicle1, and grain yield plant1 within the DH lines was similar to or lower than that within the conventional varieties and lower than that within the F5 lines. The frequency distribution of the DH lines and the F2 plants showed a similar pattern for plant height, panicle length, and grain weight. But for panicle number plant-1 and grain number panicle-1, the DH lines had less variation and lower values than the F2 plants. Plant height, panicle number plant-1, panicle length, and grain weight of some DH lines were comparable with those of the hybrid. But none of them could reach the heterotic level of the hybrid for grain number panicle-1 and only one DH line showed a yield level similar to that of the hybrid and an increased yield by 19% over the better parent
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