Abstract

he present investigation was carried out to assess the extent of genetic variation in F2 and F3 generation of two selected crosses viz., ACK 09009 × ADT 43 and IR 8 × ASD 16 based on yield and quality parameters for eleven characters. Both the crosses showed substantial variation in F2 generation and reduced little in the subsequent F3 generation. Analysis of variance revealed significant differences among the genotypes for all characters studied, indicating a high degree of variability in the material. High values of heritability and genetic advance were observed for the traits number of productive tillers per plant and single plant yield in second and third filial generations of both the crosses. Besides, IR8 × ASD 16 also recorded high heritability and genetic advance as per cent of mean for plant height and number of grains per panicle. It indicates that these traits are controlled by additive gene action, thus offering the possibility of crop improvement through selection. In ACK09009 × ADT 43 the number of productive tillers per plant, days to fifty per cent flowering, number of grains per panicle exhibited significant positive correlation with single plant yield whereas in IR8 × ASD 16 significant positive correlation with single plant yield was noted for number of productive tillers per plant, number of grains per panicle and 1000 grain weight. Hence, selection for these characters will be effective in yield improvement. KEYWORDS: Genetic variability, Heritability, Correlation, Rice (Oryza Sativa L.).

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