Vol. 13 No. 1
Inheritance and association of yield and its attributing traits in rice (Oryza sativa L.)
Author(s): L. HIJAM, K. K. SARKAR, AND S. MUKHERJEE
Abstract: Rice is the primary food crop of half of the world’s population and improving its productivity by the genetic selection is crucial. Fifty genotypes of rice were evaluated during 2011 and 2012 on the basis of eleven yield and its attributing traits following Randomized Block Design with three replications with the objectives to study the different genetic parameters and their association among various yield attributing traits. High estimates of GCV and PCV were obtained for grain yield per plant, harvest index, l: b of rice grain, filled grains per panicle and 1000 grain weight. High heritability coupled with high genetic advance was reported for plant height, days to 50 per cent flowering and filled grains per panicle indicating preponderance of additive gene action and through simple selection on the basis of these characters considerable improvement in rice could be perceived. The correlation coefficient at genotypic level was in general higher than their phenotypic correlations. The characters number of effective tillers per plant, filled grains per panicle, grain breadth and 1000 grain weight exhibited significant positive association with yield per plant. Path coefficient analysis revealed days to 50 per cent flowering, number of effective tillers per plant, filled grains per panicle, grain breadth, grain l: b ratio and harvest index had positive direct effect on yield. Based on overall magnitudes of heritability, genetic advance, correlation and path analysis, number of effective tillers plant-1, filled grains panicle-1, grain breadth and 1000 grain weight should be given emphasised for selecting high yielding genotypes.
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