ÃÞ »¨ ѧ ±¨ Cotton Science 2010£¬22£¨5£©£º471-478
Study on Relations on Photosynthetic Production and Its Distribution of Super High-Yield Cotton in South Xinjiang Abstract: In order to study yield formation and the relationship between the photosynthesis matter production and its distribution of the super-high yield cotton£¬a field experiment was conducted in south Xinjiang under natural ecology conditions in 2008 and 2009. The results showed that the leaf area index(LAI) of the super-high yield cotton increased significantly than that of high-yield or mid-low yield cotton before flowering. The max LAI appeared at boll forming stage£¬after that, the LAI decreased slowly but still kept at a relatively high level until the end. There is a close relationship between leaf SPAD and its Pn, that is to say, the leaf SPAD of the super-high yield cotton increased fast before flowering, and kept at a high level at the end of the growth stage. Before flowering, the leaf Pn also increased fast, and had a slowly decreasing period. The dry matter aboveground and that of bud and boll accumulated fast and lasted longer. Photosynthetic production of the super-high yield cotton transmitted into stem and leaves mainly at the stage before flowering, then the bud and boll had got larger transmission amount which guaranteed the yield formation. But a relatively larger photosynthesis production still transmitted into stem and leaves in the high and mid-low yield cotton, this had a negative effect on cotton yield.
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