International Journal of Ecology and Environmental Sciences

International Journal of Ecology and Environmental Sciences


International Journal of Ecology and Environmental Sciences
International Journal of Ecology and Environmental Sciences
2020, Vol. 2, Issue 3
Combining ability and heterosis studies for grain yield and its components in rice (Oryza sativa L)

T Virender Jeet Singh, Ch Damodar Raju, Y Chandra Mohan, R Jagadeeshwar, M Balram, L Krishna

An experiment was carried out to study combining ability and heterosis in rice with a set of 32 hybrids along with their parents (B and R lines) and standard checks viz., RNR 15048 and PA 6444 were evaluated for grain yield and yield attributing traits. The mean performance of the F1s for most of the traits recorded higher than that of parents except for milling per cent. The analysis of variance exhibited significant differences among parents, lines and hybrids for most of the traits studied. Degree of dominance was recorded greater than unity for all the traits except for plant height (0.56), panicle length (0.97), panicle weight (0.90), 1000 grain weight (0.77), number of grains per panicle (0.75), spikelet fertility (0.85), kernel length (0.91), and kernel breadth (0.96). GCA variances were lower than SCA variances for most of the traits. The analysis revealed the predominance of non-additive gene action for most of the traits under study. Among the CMS lines studied, JMS 14A was rated as good general combiner in the desired direction for several traits including yield. Among the testers, RNR 26059, RNR 26072, RNR 26074 and PAU 2K10-23-451-2-37-34-0-3 were performed as good general combiners. Among thirty-two hybrids JMS 14A × RNR 26083, CMS 64A × PAU 2K10-23-451-2-37-34-0-3, CMS 23A × RNR26072, JMS 14A × RNR 26084, CMS 23A × RP 5898-54-21-9-4-2-2, JMS 20A × Pusa 1701-10-5-8 and CMS 64A × RNR 26059 were exhibited high SCA effects for grain yield per plant. Thirteen hybrids were recorded positive significant standard heterosis over variety (RNR 15048), whereas six hybrids were recorded positive significant heterosis over the hybrid check (PA 6444). Overall data revealed that JMS 14A × RNR 26083, CMS 64A × PAU 2K10-23-451-2-37-34-0-3, CMS 23A × RNR26072 and JMS 14A × RNR 26084 were identified as potential hybrids for most of the traits based on their sca and heterosis estimates. These combinations could be used for the exploitation of heterosis in a hybrid breeding program
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How to cite this article:
T Virender Jeet Singh, Ch Damodar Raju, Y Chandra Mohan, R Jagadeeshwar, M Balram, L Krishna. Combining ability and heterosis studies for grain yield and its components in rice (Oryza sativa L). International Journal of Ecology and Environmental Sciences, Volume 2, Issue 3, 2020, Pages 67-75
International Journal of Ecology and Environmental Sciences International Journal of Ecology and Environmental Sciences