CACTA and MITE Transposon Distributions on a Genetic Map of Rice Using F15 RILs Derived from Milyang 23 and Gihobyeo Hybrids

  • Kwon, Soon-Jae (Division of Biotechnology, Kangwon National University) ;
  • Hong, Sung-Won (Division of Biotechnology, Kangwon National University) ;
  • Son, Jae-Han (Division of Biotechnology, Kangwon National University) ;
  • Lee, Ju Kyong (Division of Biotechnology, Kangwon National University) ;
  • Cha, Yong-Soon (Department of Molecular Genetics, National Institute of Agricultural Biotechnology, Rural Development Adminstration) ;
  • Eun, Moo-Young (Department of Molecular Genetics, National Institute of Agricultural Biotechnology, Rural Development Adminstration) ;
  • Kim, Nam-Soo (Division of Biotechnology, Kangwon National University)
  • Received : 2006.01.11
  • Accepted : 2006.04.04
  • Published : 2006.06.30


Up to 35% of the rice genome consists of various kinds of transposons, and CACTA and MITE are two of the major class 2 DNA transposons in the genome. We have employed the consensus sequences of Rim2/Hipa CACTA, Stowaway MITE Pangrangja, and Tourist MITE Ditto for transposon display (TD) analysis to locate them on a genetic map, with 58 SSR markers used to anchor them. The TD analysis produced a high profile of the polymorphisms between the parental lines, Oryza sativa var. Gihobyeo/O. sativa var. Milyang, in intraspecific $F_{15}$ RIL lines, locating 368 markers of Rim2/Hipa CACTA, 78 markers of Tourist MITE Ditto, and 22 markers of Stowaway MITE Pangrangja. In the segregation analysis, non-parental segregating bands and segregation distortion bands were observed. The recombinant genetic map spans 3023.9 cM, with 5.7 cM the average distance between markers. The TD markers were distributed unequally on the chromosomes because many TD markers were located in pericentric chromosomal regions except in the cases of chromosomes 2, 3, 6 and 9. Although the number of transposon markers was not sufficient to include all rice class 2 transposons, the current map of CACTA and MITE transposons should provide new insight into the genome organization of rice since no previous DNA transposon map is available.


CACTA;Genetic Map;MITE;Oryza sativa;Transposon


Supported by : Crop Functional Genomics Center


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