棉 花 学 报 Cotton Science 2007，19(1)：13-17
Effects of Dry Matter Accumulation on Seed Cotton Yield and Organ Development in Bt Cotton Abstract：The study was undertaken on two Bacillus thuringiensis(Bt)transgenic cotton cultivars，one conventional (GK19) and the other a hybrid (CCRI 29)，during the 2001 and 2002 growing seasons at Jiangsu Provincial Key Lab. of Crop Genetics and Physiology，Yangzhou University，China. The objective of this study was to investigate the effects of population dry matter accumulation (DMW) on seed cotton yield and organ development in Bt cotton. The results indicated that the seed cotton yield was highest，when population DMW maintained optimum before peak flowering，increased after peak flowering. The DMW accumulation before peak flowering had significant positive correlation with the plant height，LAI and vegetative organs DMW，respectively. The population fruit-branches，fruit-nodes and reproductive dry weight were highest，respectively，when population DMW maintained at optimum value. The population reproductive organs，DMW，bolls，boll retention and boll weight bolstered when population DMW accumulation increased after peak flowering. These results suggest that the optimum population structure in LAI，plant height，fruit-branches and fruit-nodes may be expected when the DMW before peak flowering was to maintain at reasonable range in the population，Based on the population，increasing dry matter accumulation from peak flowering to peak boll open was basis for higher yield.
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