Heterosis and combining ability for yield and oil content in a half dial! el cotton Gossypium hirsutum (L.) over environments

摘要

Eight parents of G. hirsutum (L.) cotton and their 28 crosses with two checks studied for heterosis and combining ability revealed that both additive and non-additive gene effects were important. However, magnitude of gca was comparatively higher thantheir respective sea. The crosses showing high sea effects were not always the result of G X G combining parents indicating limited utility of parental high gca effect. The crosses showing high sea effects for oil content involved atleast one good gca parent for oil content. The relative ranking on the basis of per se performance and heterosis differed. The magnitude of heterobeltiosis and standard heterosis were moderate to higher for seed cotton yield, whereas it was lower to moderate for oil content, seed index and ginning outturn.