Genetic variation, heritability, correlations and path-Analysis among agronomic and grain characters in rice
1992
Dhaliwal, T.S. | Sharma, H.L. (Punjab Agricultural Univ., Ludhiana (India). Seed Research and Production Unit Punjab)
Seventy-eight diverse rice genotypes were evaluated in a randomized complete block design to estimate genetic variation and heritability for grain and agronomic characters. Path-analysis was used to partition the genetic correlations between characters into direct and indirect effects. Number of grains per panicle, number of panicles per plant and 100-grain weight showed high genotypic and phenotypic coefficient of variation. Good amount of genetic variability also existed for grain yield, plant height and panicle length. Heritability estimates were high (greater than 80 percent) for all characters, except grain yield. Estimates of expected genetic advance (as percent of mean) were high for number of grains per panicle, number of panicles per plant and 100-grain weight. Number of grains per panicle, number of panicles per plant, panicle length and 100-grain weight showed positive and significant correlation with grain yield and also had high direct positive effect on grain yield. Indirect effect of panicle length via number of grain per panicle was also high. Our observations indicated that grain yield could be improved by selecting for number of grains per panicle, number of panicles per plant, panicle length and 100-grain weight.
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