Study of genetic control of salinity tolerance in bread wheat cv. Kavir-using generation mean analysis

Kavir wheat is one of the salinity tolerant cultivars that have been improved in Iran. In this research, F1, BC1, BC2 and F2 generations derived from a cross between Kavir × Arta and Kavir × Moghan3 (Arta and Moghan3 are susceptible to salinity) were evaluated through generation mean analysis in non-stress and salinity stress conditions in a randomized complete block design with three replications at the Agriculture Research Center of Kerman. The irrigation water salinity was 0.63 and 15 dS/m in non-stress and stress conditions, respectively. The salinity of farm soil was 2.1 dS/m in both conditions. The traits of flowering and maturity time, plant height, flag leaf relative water content, amount of Na and K in flag leaf, yield per plant and hundred seed weight were recorded for each treatment during the growth season and after harvest. The frequency distribution showed that Kavir was the superior parent in terms of the amount of Na while Arta and Moghan3 were the superior parent in terms of the amount of K and Kﳖ in non-stress conditions. The concentration of Na decreased and the concentration of K and Kﳖ increased in Kavir in stress conditions, while this condition was contrary in Arta and Moghan3. These results showed that when the plant encounters stress, some genes will be activated, which will result in a decrease in the concentration of Na and increase K uptake. Scale test results rejected the adequacy of the additive-dominance model and confirmed the presence of epistatic effects for these traits (except for Kﳖ in stress conditions) in both environments. None of these tests were significant for the Kﳖ in stress conditions. This result showed that the Kﳖ was affected by additive × additive gene effect and the adequacy of the three-parametric models in the joint scaling test also confirmed this.