Physiological studies indicated that flag leaf has high contribution in wheat grain yield. In addition, number, distribution, and morphology of stomatal characteristics are important traits in the drought resistance and adaptation of wheat cultivars to fluctuating CO2 levels. A complete set of diallel crosses among seven durum wheat lines were used to study of genetic parameters of stomatal and flag leaf characterstics. Seven traits including stomata frequency, stomatal surface and stomata size in abaxial and adaxial of flag leaf, flag leaf length, width and area were measured. The analysis of variance revealed significant differences among genotypes for all traits. General combining ability variance was highly significant for all the characters and specific combining ability variance was highly significant for all the characters except flag leaf length and flag leaf area. The mean square ratio of GCA to SCA implied the importance of additive genetics effects in expression of flag leaf length and stomata size in the front and surface of the flag leaf. Reciprocal mean squares were significant for all traits. Diper-6 had the highest GCA effect for flag leaf area, flag leaf length and flag leaf width. The biplot showed the same result. The heritability in narrow sense was highest (0.27 and 0.21) for flag leaf length and adaxial stomatal surface. Base on narrow sense heritability, selection for flag leaf length and adaxial stomatal surface in primary generations could be successful in the genetic material.

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