Mapping QTLs for seed yield and drought susceptibility index in soybean (Glycine max L.) across different environments  

作　　者：Weijun Du Min Wang Sanxiong Fu Deyue Yu 

机构地区：[1]National Center for Soybean Improvement, National Key Laboratory of Crop Genetics and Germplasm Enhancement,Nanjing Agricultural University, Nanjing 210095, China [2]College of Agronomy, Shanxi Agricultural University, Taigu 030801, China

出　　处：《Journal of Genetics and Genomics》2009年第12期721-731,共11页遗传学报（英文版）

基　　金：supported in part by the National High-Tech Program (No.2006AA10Z1C1);National Basic Research Program (No.2004CB117206 and 2009CB118400);the National Natural Science Foundation of China (No.30471094);the Key Project of Science and Technology of Shanxi Province (No.051017);the Scientific Research Foundation for Youth Academic Leaders from University in Shanxi Province (No.200425)

摘　　要：Drought stress has long been a major constraint in maintaining yield stability of soybean （Glycine max （L.） Merr.） in rainfed ecosystems. The identification of consistent quantitative trait loci （QTL） involving seed yield per plant （YP） and drought susceptibility index （DSI） in a population across different environments would therefore be important in molecular marker-assisted breeding of soybean cultivars suitable for rainfed regions. The YP of a recombinant line population of 184 F2：7：11 lines from a cross of Kefengl and Nannong1138-2 was studied under water-stressed （WS） and well-watered （WW） conditions in field （F） and greenhouse （G） trials, and DSI for yield was calculated in two trials. Nineteen QTLs associated with YP-WS and YP-WW, and 10 QTLs associated with DSI, were identi- fied. Comparison of these QTL locations with previous findings showed that the majority of these regions control one or more traits re- lated to yield and other agronomic traits. One QTL on molecular linkage group （MLG） K for YP-F, and two QTLs on MLG C2 for YP-G, remained constant across different water regimes. The regions on MLG C2 for YP-WW-F and MLG H for YP-WS-F had a pleiotropic effect on DSI-F, and MLG A1 for YP-WS-G had a pleiotropic effect on DSI-G. The identification of consistent QTLs for YP and DSI across different environments will significantly improve the efficiency of selecting for drought tolerance in soybean.Drought stress has long been a major constraint in maintaining yield stability of soybean （Glycine max （L.） Merr.） in rainfed ecosystems. The identification of consistent quantitative trait loci （QTL） involving seed yield per plant （YP） and drought susceptibility index （DSI） in a population across different environments would therefore be important in molecular marker-assisted breeding of soybean cultivars suitable for rainfed regions. The YP of a recombinant line population of 184 F2：7：11 lines from a cross of Kefengl and Nannong1138-2 was studied under water-stressed （WS） and well-watered （WW） conditions in field （F） and greenhouse （G） trials, and DSI for yield was calculated in two trials. Nineteen QTLs associated with YP-WS and YP-WW, and 10 QTLs associated with DSI, were identi- fied. Comparison of these QTL locations with previous findings showed that the majority of these regions control one or more traits re- lated to yield and other agronomic traits. One QTL on molecular linkage group （MLG） K for YP-F, and two QTLs on MLG C2 for YP-G, remained constant across different water regimes. The regions on MLG C2 for YP-WW-F and MLG H for YP-WS-F had a pleiotropic effect on DSI-F, and MLG A1 for YP-WS-G had a pleiotropic effect on DSI-G. The identification of consistent QTLs for YP and DSI across different environments will significantly improve the efficiency of selecting for drought tolerance in soybean.

关 键 词：drought susceptibility index （DSI） QTL mapping seed yield per plant （YP） SOYBEAN 

分 类 号：S828.2[农业科学—畜牧学] F326.12[农业科学—畜牧兽医]