Genetic mechanism of leaf venation and stomatal traits for breeding drought tolerant lines in wheat

摘要

Nature of gene action and combining ability for six physio-morphological traits were performed in a 6 × 6 combination of wheat genotypes. The mean squares for general combining ability (GCA) were highly significant for all traits except stomata frequency and flag leaf area which were non-significant. Highly significant mean squares for specific combining ability (SCA) were found only for flag leaf area, leaf venation and stomata frequency. Additive type of gene action was found to be of greater importance for all the characters except for leaf venation where non-additive gene action was more important. Variety Pasban-90 had high GCA effects for stomata size, epidermal cell size and hygrophilic collides. Lowest SCA effects were observed in cross the 2×3 for stomata size and stomata frequency while the cross 6 × 3 had high reciprocal effects for stomata size and epidermal cell size.