Genetic Components and Nature of Gene Action in Some New Hybrids of Grain Sorghum under Drought ....

Under two irrigation treatments, four sorghum lines [Cytoplasmic-Genetic Male Sterile (CGMS) Lines], three males (testers), and their 12 top crosses (produced through line x tester mating design) were used to estimate the combining ability, genetic components, and the type of gene activity (environments). For all analysed variables from combined data in both seasons, highly significant variations were discovered among settings, genotypes (parents and crosses), lines, and line x tester interactions (2018 and 2019). In both seasons, except for the amount of green leaves in 2018, line x tester x environment (L x T x E) interactions were significant for all examined traits. implying that the top crosses between the lines and the testers varied depending on the circumstances. The best top crosses were (L1xT3, L2xT3, L3xT3, and L4xT3), which out-yielded the crosses means and were also drought-tolerant (low DSI values). In this regard, four top crossings (L1xT3, L2xT3, L3x T3, and L4xT3) were the most promising hybrids in both seasons, having the highest acceptable heterotic values for all analysed features over mid and better parents. In both seasons, one line (L2) had a highly significant positive GCA influence on 1000 grain weight and grain production per plant, while one tester (T3) was regarded a good general combiner for plant height. In both seasons, the number of green leaves and out-yielding the testers mean The prospective top crosses with excellent acceptable SCA effects were obtained using the generic combiners (good x good), (good x poor), (poor x good), and (poor x poor), suggesting that both additive and non-additive gene activities were essential in the expression of the examined traits. For all attributes in both seasons, the magnitudes of additive genetic variations (2A) were greater than those of non-additive genetic variances (2D), indicating that additive gene action was prominent in the inheritance of these traits. For all of the trs investigated, the magnitudes of variances from the 2A x E interaction were bigger than those from the 2D x E interaction. implying that additive variation was more influenced by drought circumstances than non-additive variance. Heritability estimations provided additional support for the preponderance of non-additive gene activity in the inheritance of the traits tested. As a result, a crossing programme might be employed to develop very promising grain sorghum hybrids that can withstand water scarcity in the face of future climate change.

Please see the link :- https://globalpresshub.com/index.php/ARJOCS/article/view/855