Inheritance of Some Physiological Parameters on Grain Yield in Durum Wheat (Triticum Durum Desf.)

Six generations (P₁, P₂, F₁, F₂, BC₁ and BC₂) of four crosses of durum wheat were used for the estimation of genetic parameters viz., photosynthetic capacity, flag leaf area, length of peduncle, peduncle area, and grain yield per plant. Both additive and dominance gene actions were involved in the inheritance of all the characters except peduncle area, where only additive gene action was important. Additive × dominance (j) interaction was important for the expression of all the traits under study. In view of importance of both additive and non additive gene effects, a biparental mating or diallel selective mating may be useful in isolating desirable types for genetic improvement of the physiological traits and grain yield in durum wheat.