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Pakistan Journal of Biological Sciences

Year: 2000  |  Volume: 3  |  Issue: 6  |  Page No.: 983 - 988

Inheritance of Yield and Some Other Morpho-physiological Plant Attributes in Bread Wheat under Irrigated and Drought Stress Conditions

Ghulam Mahboob Subhani and Muhammad Aslam Chowdhry

Abstract

A 6 x 6 diallel cross involving six bread wheat varieties i.e., Pak.81, LU26S, Inqlab 91, Rohtas 90, 4072 and 4943 was analysed to draw a Vr/Wr graph. Partial dominance alongwith additive type of gene action were exhibited for stomatal frequency, specific flag leaf weight, days to heading, plant height, spike length and 1000-grain weight under both environments. Over dominance was observed for leaf venation under irrigated as well as drought stress conditions. Whereas over dominance type of gene action changed into partial dominance or vice versa with the change of environment for flag leaf area, tillers per plant, grains per spike, biomass per plant and grain yield per plant. Genotype 4943 possessed maximum dominant genes for grain yield per plant, biomass per plant, grains per spike and tillers per plant under irrigated conditions and LU26S for 1000-grain weight, days to heading and flag leaf area. In case of drought stress conditions variety Inqlab 91 had maximum dominant genes for grain yield per plant, biomass per plant, grains per spike and plant height while genotype 4943 for 1000-grain weight, tillers per plant, days to heading and stomatal frequency. Dominant genes involved in the inheritance of leaf venation, flag leaf area, specific flag leaf weight, plant height, spike length, grains per spike, 1000-grain weight, biomass per plant and grain yield per plant and recessive genes accounted for the increase of days to heading and tillers per plant under both environments.

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