Journal of FARM SCIENCES, Vol 30, No 3 (2017)

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Combining ability analysis in newly developed S6 inbred lines of maize (Zea mays L.)

NIDHI SHANKAR, G. SHANTHAKUMAR

Abstract


The present study was conducted to assess the GCA of parents and SCA of hybrids for yield and yield relatedtraits and to know the extent of heterosis. Ninety F1,s were generated by crossing thirty inbreds and three testers. Thesehybrids along with parents (lines and testers) and checks were evaluated in RBD with two replications during kharif 2014.The ratio of sca/gca variance revealed that there was preponderance of non-additive gene action in the expression of mostthe traits under study. Inbred lines viz., N-4, N-5, N-6, N-7, N-14, N-22 and N-30 were good general combiners for grainyield. Tester T-5 and DMIL-101 are good general combiner for grain yield. Among the hybrids, Hybrid-12, Hybrid-14,Hybrid-21, Hybrid-23, Hybrid-26, Hybrid-38, Hybrid-46, Hybrid-52, Hybrid-65, Hybrid-71, Hybrid-73 and Hybrid-90exhibited highest significant sca effects for grain yield. Hybrid-21, Hybrid-42, Hybrid-65, Hybrid-73 and Hybrid-90exhibited high heterosis over checks for grain yield.

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