Genetic Variability Studies in Segregating Generation of <i>Gossypium barbadense</i> lines in cotton

Abstract

The research work comprising of genetic variability, heritability and genetic advance study for seed cotton yield and its components in segregating F 5 generation of cotton ( Gossypium Barbadense L.) was carried out during 2011 at the Main Agricultural Research Station, University of Agricultural Sciences, Dharwad, India. ‘F’ test indicated highly significant variation among the brbadense lines for all the characters except number of bolls per plant. Genetic potential of segregating F 5 generation for different parameters revealed plant height ( 65.33 cm to100.33 cm ), number of bolls per plant (22.5 to 39.33), mean boll weight (1.67 g to 3.23 g) and seed cotton yield (441.81 kg/ha to 2175.70 kg/ha). The broad sense heritability for plant height was moderate (0.125), genetic advance was low (3.01) and genetic advance as per cent of mean was about 3.68%. For number of bolls per plant, the phenotypic variance was 31.38, genotypic variance was 4.53 and moderate broad sense heritability (0.14). The GCV and PCV values for number of bolls per plant were low to moderate. The phenotypic variance and genotypic variance for mean boll weight were 0.19, 0.05, respectively. The broad sense heritability for boll weight was 0.26, while the genetic advance or gain was 0.24 under 5%. The GCV and PCV values of mean boll weight were low to moderate in all population. For seed cotton yield, h 2 bs was high (0.72) and genetic advance under 5% selection intensity was 680.51.The phenotypic coefficient of variation (38.97) and genotypic coefficient of variation (33.05) were high.