عنوان مقاله [English]
Breeding for drought tolerance is one of the most efficient ways for preventing yield loss in dry conditions. Diallel method is one of the best methods for genetic evaluation of germplasm before starting of breeding program. In this experiment seven bread wheat genotypes including old genotypes and elite lines were crossed in a half diallel mating design. Parents and F1s were planted at stress and normal condition in a RCBD design with three replications. In addition to pheonologic recording, morphological traits and grain yield were measured after harvest. Analysis of variance for diallel experiment showed that the effect of GCA effect was significant for all traits that imply there is significant additive effect in controlling of all traits. Results showed that each genotype is good considering one or some traits. Using biplot analysis, parents with high SCA were recognized for different traits. For spikelets number per ear, ear number and thousand weight crosses Kavir×Shiraz, Sardari×Shiraz and Azar2×WS-82-9 had the highest SCA. Mather and Jinks graphical analysis showed the adequacy of additive-dominance gene action model. Degree of dominance was between from 0 to 1 for most traits which showed the gene action is almost partial dominance. Some genotypes like WS-82-9, Sardari and Kavir can be used for improving of traits thousand weight, ear number and spikelets in ear in both conditions, respectively. Also WS-82-9 is an elite line that can be acceptable genotype for dry condition.