Mapping of Quantitative Trait Loci for Salt Tolerance at the Seedling Stage in Rice

  • Lee, Seung Yeob (Institute of Life Science and Natural Resources, Division of Plant Resources Science, Wonkwang University) ;
  • Ahn, Jeong Ho (Institute of Life Science and Natural Resources, Division of Plant Resources Science, Wonkwang University) ;
  • Cha, Young Soon (Rice Functional Genomics Team, National Institute of Agricultural Biotechnology) ;
  • Yun, Doh Won (Rice Functional Genomics Team, National Institute of Agricultural Biotechnology) ;
  • Lee, Myung Chul (Rice Functional Genomics Team, National Institute of Agricultural Biotechnology) ;
  • Ko, Jong Cheol (Gyehwado Substation, Honam Agricultural Research Institute, NICS, RDA) ;
  • Lee, Kyu Seong (Gyehwado Substation, Honam Agricultural Research Institute, NICS, RDA) ;
  • Eun, Moo Young (Rice Functional Genomics Team, National Institute of Agricultural Biotechnology)
  • Received : 2005.09.07
  • Accepted : 2006.02.02
  • Published : 2006.04.30

Abstract

Salt tolerance was evaluated at the young seedling stage of rice (Oryza sativa L.) using recombinant inbred lines (MG RILs) from a cross between Milyang 23 (japonica/indica) and Gihobyeo (japonica). 22 of 164 MG RILs were classified as tolerant with visual scores of 3.5-5.0 in 0.7% NaCl. Interval mapping of QTLs related to salt tolerance was conducted on the basis of the visual scores at the young seedling stage. Two QTLs, qST1 and qST3, conferring salt tolerance, were detected on chromosome 1 and 3, respectively, and the total phenotypic variance explained by the two QTLs was 36.9% in the MG RIL population. qST1 was the major QTL explaining 27.8% of the total phenotypic variation. qST1 was flanked by Est12~RZ569A, and qST3 was flanked by RG179~RZ596. The detection of new QTLs associated with salt tolerance will provide important information for the functional analysis of rice salt tolerance.

Keywords

Quantitative Trait Loci (QTL);Recombinant Inbred Line (RIL);Rice;Salt Tolerance;Seedling Stage

Acknowledgement

Supported by : Crop Functional Genomics Center

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