Combining ability and gene action study for grain yield and its attributing traits in Indian mustard
Combining ability and nature of gene interaction that contribute to seed yield and its attributing traits in Indian mustard were investigated using 60 hybrids developed by crossing three females (lines) with twenty males (testers) in a Line x Tester mating system. The results revealed that GCA and SCA ratio (σ2GCA/σ2SCA) was less than unity for all the traits except for days to 50 % flowering. This indicated that non-additive components played relatively greater role in the inheritance of all the traits except days to 50 % flowering for which greater role of additive components was found. The estimate of GCA effects indicated that the parents GM-2, NRCM-120, PAB-9511 and IC-261670 were identified as good general combiners indicating their ability in transmitting additive genes in the desirable direction to their progenies. The hybrids viz., GM-2 x PYM-7 (10.81), GM-3 x NUDH-45-1 (10.70) and GM-3 x PAB-9511 (8.36) were found to be the best specific crosses for seed yield per plant. Among these hybrids, GM-2 x PTM-7 was also recorded significant sca effects in desired direction for number of primary branches per plant, number of secondary branches per plant and number of siliquae per plant, while GM-3 x NUDH-45-1 also exhibited significant sca effects for number of primary branches per plant, number of secondary branches per plant, number of siliquae per plant, siliquae length and oil content. Therefore, these hybrids can be further exploited for selection of transgressive segregants.
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