Abstract
A set of 22 experimental wheat lines along with four check cultivars were evaluated in irrigated and unirrigated environments with objectives to determine genetic and phenotypic variation and heritability estimates for yield and its traits. The two environments were statistically at par for physiological maturity, plant height, spikes m-2 , spikelets spike-1 , and 1000-grain weight. Highly significant genetic variability existed among wheat lines (P ≤ 0.01) in the combined analysis across two test environments for traits except 1000- grain weight. Genotypes x environment interactions were non-significant for traits indicating consistent performance of lines in two test environments. However lines and check cultivars were two to five days early in maturity under unirrigated environment. Plant height, spikes m-2 and 1000-grain weight also reduced under unirrigated environments. Genetic variances were greater than environmental variances for most of traits. Heritability estimates were of higher magnitude (0.74 to 0.96) for plant height, medium (0.31 to 0.56) for physiological maturity, spikelets spike-1 (unirrigated) and 1000-grain weight, and low for spikes m-2 .
