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Genetic Analysis for Development of Rice Hybrids for South Asia: Genetic Analysis for Development of Two and Three Line Rice Hyb,Used
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Combining ability analysis revealed importance of nonadditive gene action in the expression of various yield contributing characters.The results indicated that the UPR 3406722 (L5 ) and UPR 34131521 (L28 ) were the best general combiners among lines as evident from significant GCA effects for ten characters. The best heterotic hybrids, UPR 3434621 UPRI 95167 (L32 T1), UPRI 20085 IR 58025A (L33 T2) and UPR 3528812 UPRI 95167 (L36 T1) in normal conditions expressing higher SCA effects and per se performance, were also involved good/ good combining parents into them. The crosses, L32 T1, L33 T2 and L36 T1 involving good/good combining parents were suggested to exploitation for isolating high yielding pure lines and/or for straight use in hybrid breeding. On the basis of spikelet fertility percent, indica lines were grouped as maintainer, restorer and partial restorer / maintainer lines. Among 50 indica lines only 3 lines (L31, L37 and L42) behave like a maintainer with both of CMS lines (IR 58025A and Pusa 6A),19 lines behave like a restorer with both of CMS (IR58025A and Pusa 6A) lines and rest behave like partial restorer / maintainer lines.
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