Genetic variability heritability and genetic advance studies in cotton

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Author: 
Eswari, K.B., Dr. Sudheer Kumar S., Dr. Gopinath and Dr. Rao, M.V.B.
Abstract: 

The experiment was carried out at college farm, college of Agriculture, Rajendranagar, Hyderabad, to determine genetic variability, heritability and genetic advance estimates in upland cotton. The analysis of variance involving a set of 11 genotypes for eleven characters viz., Days to 50 % flowering, Number of monopodia/plant, Number of sympodia/plant, Number of bolls/plant, Boll weight, Ginning percentage, 2.5 % span length, Uniformity ratio, Bundle strength, Micronaire value and Seed cotton yield/plant, revealed highly significant mean sum of squares for all the characters indicating greater diversity among the genotypes. The value of phenotypic coefficient of variation (PCV) is greater than genotypic coefficient of variation (GCV); it means that the apparent variation is not only due to genotypes but also due to influence of environment. High GCV and PCV were observed for number of monopodia per plant. The difference between the estimates of PCV and GCV were low for all the characters except number of monopodia per plant thereby indicating that lesser role played by the environment in the expression of these characters. The characters Number of bolls/plant, Bundle Strength, Ginning percentage, Boll Weight, 2.5 % span length, Seed cotton yield/plant and Days to 50 % flowering exhibited high estimates of heritability. High heritability coupled with high genetic advance as percent of mean was observed for Number of bolls/plant, Boll Weight and Seed cotton yield/plant.

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