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In order to compare mode of inheritance, combining ability, heterosis and  gene action in genetic control of traits flag leaf area, relative water  content and grain filling rate of bread wheat under drought stress, a study  was conducted on 8 cultivars using of Griffing’s method2 in fixed model. Mean  square of general combining ability was significant also for all traits and  mean square of specific combining ability was significant also for all traits  except relative water content of leaf which show importance of both additive  and dominant effects of genes in heredity of these traits under stress. GCA  to SCA mean square ratio was significant for none of traits. Results of this  study showed that non additive effects of genes were more important than  additive effect for all traits. According to results we can understand that  genetic improvement of mentioned traits will have low genetic efficiency by  selection from the best crosses of early generations. Then it is better to  delay selection until advanced generations and increase in heritability of  these traits

Genetic control and combining ability of flag leaf area and relative water content traits of bread wheat cultivars under drought stress condition