A.A. Kandil, A.E. Sharief, Hasnaa S.M. Gomaa
Department of Agronomy, Mansoura University, Egypt
Agric. Research center Ministry of Agriculture and reclamation, Egypt
Key words: Bread Wheat cultivars, specific combining ability, gene action.
To estimate the general and specific combining ability in wheat for yield and its components i.e. number of spikes/plant, spike length, number of grains/spike, 1000-grain weight and grain yield/plant, were studied using 8×8 diallel crosses, excluding reciprocals. The studied genotypes were; i.e. Sides 12, Gemmiza 11, Miser 1, Miser 2, Shandaweel 1, Giza 168, Sakha 93 and Sakha 94. In the second season 2013/2014, the eight parental and28 F1’s was evaluated. Results revealed that mean squares of general and specific combining ability were significant for all studied characters. Wheat cultivars Sids12 was the best general combiner for all studied characters except number of spikes/plant; Gemmiza 11 for all studied characters except 1000– grain weight; Miser 1 for spike length and 1000- grain weight wheat. The three crosses were the best combinations, Sides 12 ×Miser 1 for spike length, Sides 12 ×Miser2 for number of spikes/plant and 1000-Kernel weight and Miser 2 × Shandaweel 1 for number of spikes/spike, 1000-kernel weight and Kernel yield/plant. The mean squares of types of gene action indicated that additive and dominance genetic variance were significant for all the studied characters except b for 1000- grain weight. Obtained results are great interest for bread wheat breeder to improve grain yield through its components.