Abstract
The present study was conducted to determine the heritability of grain yield with various yield components in six F2 populations of bread wheat originated from ten parental varieties. The experiment was carried out in Randomized Complete Block Design (RCBD) with 3 replications. Parameters viz., environmental variance, phenotypic variance, genetic variance, and broad sense heritability were calculated for different important traits such as plant height (cm), tillers plant-1 , spike length (cm), spikelets spike-1 and grains spike -1 . The results regarding mean squares depicted that the genotypes were highly significant at P< 0.01 level for as plant height (cm), tillers plant-1 , spikelets spike-1 and grains spike -1 . The crosses Qafzah-16 x Mehran showed highest performance in spike length (12.58cm), spikelets spike-1 (12.5) and grains spike -1 (74.75). The heritability in broad sense showed that all the crosses had high heritability in all the traits studied. Cross Katila-12 x Khirman showed highest heritability in plant height (86.74%) and spikelets per spike (86.33%) whereas Gamdow x TD-1 showed highest heritability 97.48 and 90.66 in grains spike -1 and tillers plant-1 , respectively.
