ÃÞ »¨ ѧ ±¨ Cotton Science 2009£¬21(3)£º163-167
Analysis of Genetic Effects for Fiber Quality in Transgenic Insect Resistant Cotton (G.hirsutum L.) Abstract£ºNine parents which seven of them were transgenic insect resistant cotton cultivars with Bt developed in China and USA, and their 36 F1 combinations were analyzed for five traits of fiber quality in two years by a genetic model of additive-dominance with interaction effects, and genetic variance components and correlations were estimated as well. The results showed that the five characters related fiber quality were controlled by additive effects, dominant effects and additive¡Áadditive effects. The main effects in micronaire, 2.5% staple strength were dominant effects, while elongation and uniformity were additive ¡Á additive effects. There were some interaction effects with large values between genotypes and environments for all five fiber traits except for fiber strength. The genotype and phenotype correlation coefficient between fiber strength and 2.5% staple length were significant, in which the dominant correlation were high, but there were no additive correlation between them. In the meanwhile, the additive genotype correlation between fiber strength and micronaire were significant, and their phenotype correlation was undetected. The F2 genotypic value and their heterosis were analyzed and forecasted from the data of parents and their F1. The result indicated that the heterosis in F2 over mid-parent were 1.0%£¬-8.5%£¬-0.8%£¬0£¬-2.9% in average for micronaire, elongation, 2.5% staple length, uniformity and fiber strength, respectively. There was no heterosis over the better parent.
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