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 grains spike-1
, spike weight, biological yield, and grain yield except days to heading. Highly significant genetic
variability existed among wheat lines (P ≤ 0.01) in the combined analysis across two test environments for traits except spike 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 heading under unirrigated environment compared to
the irrigated. Spike weight and grains spike-1
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 days to heading, spike
length, biological yield and grain yield, and low for spike weight in both the environments. The differential heritability for yield and
yield related traits suggests simultaneous evaluation of wheat lines under the two environments.
