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棉 花 学 报 Cotton Science 2008，20(1)：56-61
Heterosis and Genetic Analysis of Fiber Quality Traits of Interspecific Hybrid of G. hirsutum L. × G. barbadense L. Abstract：12F1, which combinations crossed with four G.hirsutum L. varieties (lines) and three G.Barbadense L. varieties according to incomplete diallel crossing design, were used to evaluate the heterosis and gene action of fiber quality traits of interspecific hybrid of G.hirsutum L.×G .barbadense L. in 2003 and 2004, by the genetic model of additive-dominance and their interactions with environments by MINQUE(1) approaches.The results indicated that there existed significant or extremely significant dominant effect for all main fiber traits, and extremely significant additive effect for the other four traits except micronaire, and small interactions with the environmental factors for all fiber traits. Micronaire was only controlled by dominant effect. Strength was controlled mainly by additive effect, the dominant effect was comparatively smaller. Length, uniformity and elongation were controlled by additive effects and dominant effects together, their dominant effects were higher than their corresponding additive efffects. The broad inheritance of uniformity was low and that of the other four fiber traits were very high. The results showed that dominant effect was more evident for fiber traits, except strength, of interspecific hybrid of G.hirsutum L.×G.barbadense L.than that in intraspecific hybrid of G.hirsutum L.×G.hirsutum L.,or that in intraspecific hybrid of G.barbadense L.×G.barbadense L.. The population mean heterosis of length, strength, uniformity and elongation expressed significant positive value. The population mean heterosis and the better-parental heterosis of micronaire expressed significant negative value. Strength should be selected in early generations and other traits should be selected in middle or late generations, when good fiber quality traits of G.barbadense L. was utilized by interspecific crossing.
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