Genetic Analysis of Fiber Traits and Population Heterosis for F_1 and F_2 between Different Fruit-Branch Type Cultivars in Island Cotton

yield traits of 9 parents of hybridization between “O” and “Long-Fruit-branch” plant type cultivars and their 20 F 1 crosses of Island Cotton for two years were analyzed for their additive and dominance effects by MINQUE(1) approaches. The results indicated that all 9 yield traits of F 1 had highly significant additive effects in Island Cotton. Lint percentage, boll weight, boll number at post-frost, total boll number and total lint yield were showed highly significant dominance effects. The interactions between dominance effects and environment were wholly significant. Cultivar “3836” had high additive effects on boll number at pre-frost and lint yield at pre-frost. The heterosis of yield traits were analyzed by the genetic model of additive-dominance by MINQUE(1) approaches for predicting the genotypic value and heterosis. On the average, the average heredity was that the yield traits were highly significantly negative for the population better-parental heterosis of crosses between “Long-Fruit-Branch” and “O” type fruit branch in Island Cotton. The positive mean heterosis on total lint yield for F 1 and F 2 were above 20%, lint yield at pre-frost had no positive mean heterosis.