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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (06): 988-995.doi: 10.3724/SP.J.1006.2012.00988

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS • Previous Articles     Next Articles

Fine Mapping of Drought Tolerance QTL on Chromosome 2 in Rice

NIE Yuan-Yuan1,2,ZOU Gui-Hua3,LI Yao4,LIU Guo-Lan2,CAI Yao-Hui1,MAO Ling-Hua1,YAN Long-An1,LIU Hong-Yan2,*,LUO Li-Jun2,*   

  1. 1 Rice Research Institute, Jiangxi Academy of Agricultural Sciences / Nanchang Branch of Chinese National Center for Rice Improvement, Nanchang 330200, China; 2 Shanghai Agriobiological Gene Center, Shanghai 201106, China; 3 Institute of Crop and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China; 4 Institute of Soil & Fertilizer and Resource & Environment, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China
  • Received:2011-09-02 Revised:2012-02-22 Online:2012-06-12 Published:2012-03-29
  • Contact: 刘鸿艳, E-mail: lhy@sagc.org.cn, Tel: 021-62202915; 罗利军, E-mail: lijun@sagc.org.cn, Tel: 021-62204090

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Abstract: In rice breeding research, drought tolerance (DT) is one of the most important target traits for variety improvement under ever-increasing severe drought situation in the whole world. Identification of the physiological character and grain yield QTLs directly related to DT will provide useful marker information for developing with DT rice variety via marker-assisted selection (MAS). The 87 introgression lines (ILs) selected from 269 advanced backcross introgression population derived from Zhenshan97B/IRAT109 in the Zhenshan97B background were planted in drought facilities for mapping QTLs affecting physiological characters and grain yield under irrigation and drought stress conditions. Twenty QTLs affecting leaf water potential (LWP), canopy temperature (CT), basal culm thickness (BCT), 100-grain weight (HGW), spikelets number per panicle (SN) and spikelets density were identified, which could be grouped into three types based on their behaviors. Type I included seven QTLs which were detected under both conditions; type II consisted of four QTLs which were mapped only in the control condition; and type III consisted of two QTLs which were induced by drought and detected only under the stress. The seven QTLs detected under both environments and the two QTLs detected under drought stress could directly contribute to DT and be used in rice breeding for DT by MAS.

Key words: Rice, Near-isogenic lines (NIL), Drought tolerance (DT), Water relative physiological, Grain yield

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