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

Abstract

The experiment was conducted to investigate the genetic variability and association with the yield and its component traits among YAU rice lines. The analysis of variance revealed significant differences among the tested lines indicating enough variability is present between them. The highest estimates of (PCV %) and (GCV %) were observed in spikelets per panicle. In present study, heritability of all characters were ranged from 55.26% (panicle height) to 98.63% (panicle weight). The estimates of genetic advanced ranged from 0.08 (harvest index) to 48.59 (spikelets per panicle). The character association study revealed that grain yield per plant is positive and significances correlated with all characters expect panicle length and thousand grain weight. Hence, selection of these characters may be possible to obtain superior, high yielding lines. According to the cluster analysis, the 50 YAU rice lines were separated into six groups. The highest days to flowering, filled grain (%), spikelets per panicle and yield per plant were observed in cluster V, the highest plant height found in cluster IV, the highest effective tillers per plant, panicle weight, panicle: straw weight and harvest index were observed in cluster I. The highest 1000 grain weight found in cluster II and the lowest of all character were found in cluster VI. The desirable characters can be used as germplasm sources in future rice breeding program.