Genetic variability and association study for yield and its component traits in upland cotton (Gossypium hirsutum L.)

摘要

Genetic variability, heritability, genetic advance, correlations and path coefficient analysis was carried out in 10 x 10 diallel (excluding reciprocals). The expression of all the traits indicated least influence of environment as they showed small differences between GCV and respective PCV. Number of monopodia/plant, bolls/plant and seed cotton yield/plant exhibited high heritability coupled with high genetic advance. Seed cotton yield revealed significant and positive association with plant height, sympodia/plant, bolls/plant and fibre foneness. Days to flowering, ginning percentage, lint index and 2.5 per cent span length showed negative correlations with seed cotton yield. Path analysis indicated that characters such as bolls/plant, plant height, fibre fineness and sympodia/plant were most important for selecting high yielding genotypes as they exerted significant positive correlations as well as positive direct effect on seed cotton yield. Selection based on these characters may contribute considerably to improvement in the seed cotton yield.