Genotypic and Phenotypic Connotation among Yield Components in Red Rice (Oryza sativa L.) Genotypes of Himachal Pradesh, India

Abstract

The study was conducted at the experimental farm of Rice and Wheat Research Centre, Malan during Kharif, 2021. Experimental material consist of 43 germplasm lines of red rice (Oryza sativa L.) sourced from various districts of Himachal Pradesh. Significant genotypic differences were existed among the genotypes. Correlation coefficients were computed for grain yield per plant (g), days to 50% flowering and days to 75% maturity, plant height (cm), flag leaf length (cm), flag leaf width (cm), total tillers per plant, effective tillers per plant, spikelets per panicle, 1000-seed weight (g), grain length [L] (mm), grain breadth [B] (mm), L:B ratio, biological yield per plant (g) and harvest index (%). The results revealed that grain yield per plant was positively and significantly correlated with days to 50 per cent flowering, days to 75 per cent maturity, plant height, flag leaf length, total tillers per plant, effective tillers per plant, spikelet per panicle, 1000 grain weight, grain length, L:B ratio, biological yield per plant and harvest index at phenotypic level as well as at genotypic level indicating that selection through these traits would be effective. At phenotypic level, biological yield per plant had the highest positive direct effect on grain yield per plant followed by harvest index, flag leaf length, spikelet per panicle, days to 50 per cent flowering, total tillers per plant, 1000 grain weight, grain breadth, plant height and L:B ratio. Thus they can be considered for direct selection for high grain yield.