Combining ability and heterosis for yield and its components under different environments in upland cotton (Gossypium hirsutum L.)

摘要

Investigations were carried out to study the heterosis and combining ability for yield and yield related traits by using line x tester mating design. Analysis of variance revealed significant differences among genotypes for all characters in all the environments. Partitioning of the variance in line, tester and line x tester revealed significant difference among GCA of lines for all the characters. Significant differences among SCA of hybrids were observed for all the characters in all the environments. Vagad Kalyan (T_2) and line Mysore Vijya (L_(19)) were good general combiners for most of the economic traits. Cross Bikaneri Nerma x Arizona Super Okra leaf green (T_3 x L_(12)) showed economic heterosis, significant SCA and involved one good genralcombiner parent under irrigated, high fertility for total seed cotton yield/plant.