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
2021, Vol. 3, Issue 1
Estimation of combining ability and gene action for yield, yield components and grain zinc content in rice (Oryza Sativa L.) hybrids

SK Singh, Rudresha Naik, Mounika Korada, Amrutlal Ratilal Khaire, DK Singh, Sonali Vijay Habde, Prasanta Kumar Majhi, Pratibha Singh

Thirty F1 hybrids developed by crossing 6 lines with 5 pollen parents were studied along with two checks (BPT5204 and DRR dhan-45) for 16 different characters contributing to yield and grain Zn content in rice during Kharif-2019 at Banaras Hindu University, Varanasi in a randomized complete block design with three replications. The analysis revealed that variance due to parents Vs. hybrids were found highly significant for most of the characters except for days to 1st flowering, days to 50% flowering, grain L/B ratio and harvest index. All the characters except plant height exhibited highly significant variance due to line x tester. Among the lines, HUR-3022 was identified as good general combiner for number of effective tillers, spikelet fertility %, biomass, grain yield per plant, grain yield per plot and grain Zn content. Whereas among testers, Dudhkander showed good GCA effect for panicle length, grain yield per plant, grain yield per plot, biomass and a moderate combiner for grain Zn content suggesting that these parents can be exploited in hybrid breeding programs targeted for both yield and improvement in grain Zn content. Among hybrids, cross HUR-3022 x Sathi was considered good specific combiner for grain Zn content and a moderate specific combiner for grain yield per plant and grain yield per plot and also showed highest per se performance for grain Zn suggesting hybrid HUR-3022 x Sathi may be exploited for developing high grain Zinc hybrid in the future breeding programs. Further, grain yield per plant and grain Zn content exhibited low heritability and low genetic advance as percent mean indicating a greater influence of environment on these traits.
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