Trait Association and Path Analysis Studies of Yield Attributing Traits in Rice (Oryza sativa L.) Germplasm

Abstract

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.

Genetic Dissection of Yield Determinants in Advance Breeding Lines (ABLs) of Rice (Oryza sativa L.) under Irrigated Condition of Chhattisgarh, India

“…Negative direct effect on grain yield of days to crop maturity (-1.201) were observed through its indirect effect via plant height, total tillers per plant, effective tillers per plant, panicle length and harvest index. These results are in agreement with the earlier reports by Jaiswal et al [40], Debnath et al [41] and Gupta et al [42].…”

Correlation and Path Coefficient Analysis Studies in Rice Hybrids (Oryza sativa L.)

“…Number of productive tillers per plant (0.1929) reported a positive direct effect on single plant yield due to indirect positive effects through 1000 grain weight, plant height, spikelet fertility, panicle length, days to 50% flowering and number of filled grains per panicle, while it's effect with the number of unfilled grains per panicle was negative. The results are in line with the findings of Nandha et al [23], Guptha et al [24]. Though the correlation coefficient of panicle length (0.3975) was positive, it's direct effect on single plant yield was negative and low, which is mainly due to negative indirect effects of days to 50% flowering, 1000 grain weight, plant height, number of productive tillers per plant, spikelet fertility and number of filled grains per panicle, while it has a positive indirect effect through number of unfilled grains per panicle.…”

Genetic Architecture and Association Studies for Grain Yield and its attributing Traits in Recombinant Inbred Lines for Sodicity Tolerance in Rice (Oryza sativa L.)

“…The traits showing maximum PCV should be carefully considered for selection despite environmental influence. These variability results follow Bisen et al,2019;Gupta et al, 2020.…”

“…The relationship between component characters might be owing to pleiotropic gene activity, linkage, or, more often, both. (Gupta et al, 2020). Grain yield plant -1 showed a strong, non-negative and significant relationship with plant height (0.672), effective tillers plant -1 (0.795) and filled grains panicle -1 (0.711), spikelet fertility percentage (0.848), test weight (0.847).…”