棉 花 学 报 Cotton Science 2007，19(1)：33-37
Analysis of Genetic Effects and Heterosis for Yield and Yield Traits in Transgenic Insect Resistant Cotton ( G.hirsutum L) Abstract：Nine parents and their 36 F1combinations of Bt and non Bt cotton were analyzed for four traits in two years by a genetic model of additive-dominance with environmental interaction effects. Genetic variance components and correlations of the transgenic insect resistant cotton were estimated. The result indicated that all yield traits of the transgenic insect resistant cotton were mainly controlled by the additive effects and dominant effects，the dominant effects was in the lint yield，boll weight and lint percentage，and the additive effects was in chief in bolls per plant. In addition，there was a interaction effect between genes and environments for bolls per plant and lint percentage. The genotype and phenotype correlation coefficient of yield and bolls per plant in transgenic insect resistant cotton were large，and their values were almost the same. The additive correlation between yield and bolls per plant，as well as boll weight and lint percentage were remerkble significantly. The values of additive correlation between lint yield and bolls per plant，including lint yield and lint percentage were large. The F2genotypic value and their heterosis were analyzed and forecasted from the data of parents and their F1. The result indicated that the heterosis in F2of the transgenic insect resistant cotton over mid - parent were 4.0%，5.1%，-1.3% and 3.2% in average for yield，boll per plant，boll weight and lint percentage，respectively，and those over the better parent were-7.3%，-6.0%，-4.2%and-0.5% in average for yield，boll per plant，boll weight and lint percentage，respectively. |