Efficiency of some half diallel methods analyses in bread wheat under natural rust infection
Abstract: In the current study, four methods were used to compare the efficiency of different half-diallel analyses in determining the gene action mode in the half-diallel in bread wheat crosses, excluding reciprocals. The experiment was grown at Sakha Agricultural Research Station, using the randomized complete block design with three replications under natural infection of rusts. Regardless of the analyses restrictions, comparison of the tested methods indicated that Griffing model has features of formulas definition for estimating the effects and their variances. Morley-Jones model partitioned sum of square into additive and non-additive items. Hayman’s method was characterized by graphical analyses and genetic parameters. Meanwhile, Gardner and Eberhart method has more features than the others giving a clear-cut idea about the genetic aspects of heterosis by partitioning it into different components (average, varieties and specific heterosis). All methods agreed unanimously on, significant variation among genotypes and their components that were detected for all studied traits, mainly due to genetic diversity. The parents Gemmeiza11 and Giza168 were reported as the best combiners for grain yield and rust reaction. The cross Misr2 * Giza168 and Gemmeiza11* Giza168 were found to be superior and exhibited the highest specific combining ability effects and heterosis for grain yield. There were significant differences for both additive and non-additive types of gene action for all traits except for 100-kernel weight, confirming that both were almost equally important for the inheritance, as well as implying the presence of directional dominance and imbalance of gene distribution for resistance to wheat rusts. All traits revealed that the inheritance was controlled by over- and partial-dominance with additive gene action. The genetic information obtained would be utilized in wheat breeding program for improving grain yield per plant and resistance to wheat rusts.
Publication year 2018
Pages 1-16
Organization Name
Author(s) from ARC
Publication Type Conference/Workshop
↑