棉 花 学 报 Cotton Science 2008，20(5)：394-398
QTL Mapping of Leaf Chlorophyll Content and Photosynthetic Rates in Cotton Abstract：In order to explore the genetic basis for photosynthesis and its related physiological trait of cotton, a mapping population of 273 F2：3 inbred lines derived from a four-way cross of Simian 3/Sumian 12//Zhong 4133/8891 was employed to map quantitative trait loci (QTL) of leaf chlorophyll content and photosynthetic rates in cotton by interval mapping method with MAPQTL5.0. The results showed that a total of three QTLs were detected for leaf chlorophyll content on chromosome D6,D8 and A10, respectively, which explained 4.3%，4.5% and 5.2% of the phenotypic variance, and a total of three QTLs were detected for photosynthetic rates on chromosome D5,D6 and A11，respectively, which explained 3.8%, 7.4% and 8.4% of the phenotypic variance. Additive effects were mainly genetics effects for all QTLs of two traits. These QTLs concerned with leaf chlorophyll content and photosynthetic rates in cotton were first reported, and these results should be very useful for marker-assisted selection in cotton high photosynthetic rates breeding program.
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