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《Acta Agronomica Sinica》 2007-03
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QTL Analysis of Seed and Pod Traits in Soybean RIL Population

WANG Xian-Zhi1,2,ZHANG Xiao-Juan2,ZHOU Rong2,SHA Ai-Hua2,WU Xue-Jun2,CAI Shu-Ping2,QIU De-Zhen2,and ZHOU Xin-An2,*(1 Graduate School of Chinese Academy of Agricultural Sciences,Beijing 100081;2 Oil Crops Research Institute of Chinese Academy of Agricultural Sciences,Wuhan 430062,Hubei,China)  
Seed and pod traits are important factors affecting soybean yield,which are controlled by polygenes.The previous studies have identified many QTLs associated with yield and its component.The previous genetic analysis also pointed out that improving the seed and pod traits was an efficient way to increase soybean yield,but there was little QTL analysis on seed and pod traits.In order to find out steady and repeatable QTLs of these traits,255 recombinant inbred lines(RILs) derived from the cross between Zhongdou 29 and Zhongdou 32 were used to map QTLs of seed and pod traits in two years.ANOVA analysis showed that the characters of one-seed pod,four-seed pod,and number of seeds per pod had significant year-line interaction in two years,while number of pods and number of seeds had not.A genetic linkage map of soybean genome was constructed,which consisted of 23 linkage groups with 98 SSR markers.The Interval Mapping method(IM) and Composite Interval Mapping method(CIM) were used to identify QTLs associated with one-seed pod,four-seed pod,number of pod,number of seeds,and number of seeds per pod.A total of 51 QTLs for these traits were identified in two years using different statistic methods.Among them,24 QTLs explained the phenotypic variance ranging from 5% to 80% by using interval mapping method,and 27 QTLs accounted for 4% to 73% of the variance for the 5 traits using CIM.Tow QTLs of four-seed pod and tow QTLs of number of seeds per pod were found in two years with different methods.These results can be used for the further fine mapping and marker assisted selection of these traits.
【Fund】: 国家自然科学基金项目(30671313);; 国家“十五”科技攻关计划项目(2004BA525B06);; 国家高技术研究发展计划(863计划)项目(2001AA241062)
【CateGory Index】: S565.1
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