Inheritance of grain yield and some quantitative traits in six rowed barley (Hordeum vulgare L.).

摘要

Generation mean was undertaken to estimate the different non-allelic gene actions operating in the inheritance of grain yield and its components traits in six-rowed barley (H. vulgare). Six generations, P1, P2, F1, F2, BC1 and BC2 of two crosses namely, BL-2 x RD 2433 and RD 2407 x RD 2433 were raised in a randomized block design with three replications. Ten randomly selected plants each of P1, P2 and F1, 20 plants of BC1 and BC2 and 30 plants of F2 generations were used for recording observations, on days to maturity, plant height, flag leaf area, tillers per plant, grains per spike and grain yield per plant. Scaling tests A, B and C were first applied to detect the presence of epistasis as suggested by Mather's. The estimates of gene effects of six parameter model were calculated as per Hayman. Potence ratio, heritability [ns] as per Mather's and genetic advance were also calculated accordingly. Results of analysis of potence ratio, inbreeding depression and genetic advance showed that the potence ratio for grain yield/plant indicated overdominance for both the crosses and partial dominance for flag leaf area. For plant height, there was overdominance and partial dominance in BL-2 x RD 2433 and RD 2407 x RD 2433, respectively. Results of inbreeding depression trials showed low to medium inbreeding depression for all traits, and means of these traits can be fixed in the segregating generations. Heritability and genetic advance were low, suggesting complex inheritance and non-additive gene action. The non-fixable gene effects were higher than the fixable ones for all characters..