Thirty eight rice germplasms were evaluated to assess their genetic variability, heritability, genetic advance, correlation and direct-indirect effect for grain yield and yield contributing traits. The analysis of variance revealed significant differences for all the characters under study, indicating the presence of high genetic variability among the genotypes. The genotype CRR599-4-1 was found to be the best for grain yield and effective tiller plant-1 , panicle length, test weight and spikelet fertility per cent on the basis of per se performance. The high estimates of GCV and PCV were observed for traits like grain yield per plant, filled grains panicle-1 , effective tillers plant-1 indicating their importance in selection for improving the rice yield. High heritability coupled with high expected genetic advance as percent of mean was observed for the traits field grain panicle-1 , spikelet fertility percentage and days to maturity. Grain yield plant-1 had strong positive association with spikelet fertility percentage, filled grain panicle-1 , effective tiller plant-1 , plant height and test weight and significant positive correlation with plant height, effective tillers plant-1 , test weight, filled grains panicle-1 and spikelet fertility. Path coefficient analysis revealed that days to 50% flowering, plant height, number of effective tiller, panicle length, test weight and filled grain panicle-1 exhibit positive direct effect on grain yield plant-1. 2. Materials and Methods
Forty-eight Rice germplasm were undertaken for estimating variability, heritability, genetic advance, correlation and path analysis for yield and yield attributing traits. The experiments were conducted in a randomized block design with three replications during two-season viz., July-Oct, 2017 and July-Oct, 2018 at the Agriculture Research Farm, Institute of Agricultural Sciences, Banaras Hindu University Varanasi. Analysis of variance revealed that genotypes contain significant differences for all the traits. High estimates of GCV and PCV were observed for traits like filled grains panicle-1 followed by total grains panicle-1, grain yield plant-1 and number of effective tillers plant-1. High heritability coupled with high genetic advance as % of mean was observed for the traits viz. plant height, days to 50% flowering and test weight. These characters exhibited less influence of environmental variance in their inheritance and hence could be improved by means of simple selection. Path analysis revealed that characters like filled grains panicle-1, total grains panicle-1 and number of effective tillers plant-1 had prominent direct positive effects on grain yield plant-1. Genotypes LC-53, LC-55 and LC-50 and LC-59 were found to be superior for yield and contributing traits during July-Oct, 2017 and July-Oct, 2018 respectively while LC-90 was found to be consistently overling under both seasons. Genotypes LC-54 and LC-56 were earliest in flowering and maturity suggesting that they can be used as a donor in hybridization programme for evolving early maturing rice variety.
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