Stability analysis of interspecific cotton hybrids (Gossypium hirsutum x G . barbadense )

Abstract

A study was conducted during 2003-06 to assess the yield stability of 74 interspecific cotton hybrids (Gossypium hirsutum L. x C. barbadense L. ) across 3 environments by using the Additive Main effects and Multiplicative Interactions analysis. The Additive Main effects and Multiplicative lnteraction analysis of variance indicated that the mean sum of square for seed cotton yield indicated that the genotypes, environments and G x E interaction were significantly different (P &lt 0.01) and it also showed that the environments, genotypes and G x E accounted for 84, 10 and 62% of the treatment sum of squares respectively. The proportion of environmental and G x E interaction variation for seed cotton yield was much larger than the main effects of the genotypes. The genotypes 'G 64,' 'G 58' and 'G 15' showed higher mean seed cotton yield with Principal Component Analysis (PCA) score near to zero indicating higher stability with general adoptability at all environment. The lowest yield was obtained in 'G 3' (820 kg/ha), followed by 'G 14' (954 kg/ ha), 'G 21' (933 kg /ha) and 'G 53' (862 kg/ha).