Journal of Agricultural Research (2020), Volume. 7, Issue (2)

Abstract

Genetic variability, heritability of traits, their association, and direct and indirect effects to yield are essential for crop improvement. Therefore, objectives of this study were to estimate genetic variability and correlation among yield and yield component characters of hybrids, and to find out direct and indirect effect of yield components to yield. The experiments were conducted at two locations; Department of Plant Breeding, Physiology and Ecology, Yezin Agricultural University, Yezin and Department of Agricultural Research, Kyaukse Township during wet season from June to October, 2017. The 44 Chinese hybrid genotypes along with four checks varieties (C1 - Thee Htet Yin, C2 - Sin Thukha, C3 - Ayeyar Min and C4 - Yezin Palethwe-3) were grown in a modified randomized complete block design (RCBD) with three replications in both locations. Yield and yield components were measured to investigate the variability, correlation coefficients and path analysis. All the genotypes at different locations showed significant variations for all traits considered. Moreover, the small differences between GCV and PCV were observed in all characters except number of effective tillers hill-1, and their heritability estimates (broad sense) were also high. The results showed that the selection of superior genotypes among the tested introduced Chinese hybrids on the basis of phenotypic performance could be effective. According to correlation and path analysis, number of spikelets panicle-1 and 1000 grain weight showed positive direct effect and positive correlation with yield. Therefore, these two traits can be emphasized as important traits to increase hybrid rice yield.