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棉 花 学 报 Cotton Science 2005，17(1):18-22
Studies on Genetic Improvement and Effects on Production and Distribution of Photosynthate among Different Genotypes of Cotton Abstract: The genetic improvement and photosynthate characity of different genotypes of cottons were studied in 2001 and 2003 .In this report, the fifteen cotton breeds were divided into three genotypes. The first was DGC(double gene cotton, transgenic Cry1Ac plus CpTI cotton), including sGK321，CCRI 41，CCRI 45，ZGK193，ZGK204.The second was SGC(single gene cotton, transgenic Bt cotton), including Jinmian-26，Jinmian-31，Jinmian-33，CCRI 32，CCRI 35.The last was common cotton(CC)including Jinmian-25，Jinmian-12，CCRI 35，CCRI 12，CCRI 23.The results showed that there were no great differences about max of photosynthesis (Pnmax) among three genotypes cottons. All of these Pnmax appeared in budding and flowering period. The correlation of photosynthesis and yield of cotton was not visible. The main action of photosynthesis for yield of cotton was not directly, it affected biomass of cotton to yield. The distributive rate of accumulation on source and sink organs were different in three genotypes of cotton. The effective utilization ratio (EUR) of photosynthnate accumulated after anthesis(PAAA) was different in three genotypes of cotton, CC was biggest and SGC was smallest. The influence of yield by photosynthnate accumulated before anthesis (PABA) was different in three genotypes of cotton, that was SGC＞DGC＞CC. The decreasing of biomass of SGC and DGC were mainly due to (PABA) decreased. The output rate of PAAA of SGC and DGC were higher than CC. But more PAAA was storied in the boll shell, which had important effect on increasing boll weight of SGC and DGC. At last, it was suggested that we should pay attention to PABA and boll weight in SGC and DGC breeding selection.
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