The Indian Journal of Genetics and Plant Breeding

Forty-five triple test cross progenies of wheat were produced by crossing 15 true breeding lines/varieties with three testers and grown in normal and stress environments. The data on parents and F₁s were analysed for days to heading, plant height, tillers/plant, total biomass, grains/ear, 1000-grain weight and grain-yield/plant to determine the relative usefulness of three methods for estimation of additive and dominance components of genetic variation. The variance of parents () estimated the additive component better than the two other methods (_1i + _2i and _1i + _2i + _3i). The methods 4 + 9 σ² (_1i + _2i - ₁) and 25 (σ² (2 _1i-_i) pooled with σ₂ (2 _2i-_i)] provided better estimates of dominance component than _1i-_2i method in the presence of epistasis. These two methods also gave similar estimates of dominance component.