한국작물학회지 (KOREAN JOURNAL OF CROP SCIENCE)

  • 제49권1호
  • /
  • Pages.61-68
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  • 2004
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  • 0252-9777(pISSN)
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  • 2287-8432(eISSN)
한국작물학회 (The Korean Society of Crop Science)
권호 표지

Improvement of Transformation Efficiencies using Agrobacterium-Mediated Transformation of Korean Rice

  • Cho, Joon-Hyeong (Division of Environment and Biotechnology, National Institute of Crop Science Rural Development Administration) ;
  • Lee, Jang-Yong (Division of Environment and Biotechnology, National Institute of Crop Science Rural Development Administration) ;
  • Kim, Yong-Wook (Department of Plant Resources, Dongguk University) ;
  • Lee, Myoung-Hoon (Department of Plant Resources, Dongguk University) ;
  • Park, Seong-Ho (Division of Environment and Biotechnology, National Institute of Crop Science Rural Development Administration)
  • 발행 : 2004.03.01
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초록

A reproducible transformation system via optimized regeneration media for Korean rice cultivars was established using Agrobacterium tumefeciens LBA4404 (pSBM-PPGN; gusA and bar). Although japonica rice genotypes were easier to produce transgenic plants compared to Tongil type cultivars, transformation efficiencies were not always correlated with regeneration efficiencies of non-transgenic callus on the control medium. Regeneration efficiencies of Donganbyeo, Ilmibyeo, and Manchubyeo were over 50% in non-transgenic control, however, transformation efficiencies were significantly low when only sucrose was added to the media as a carbon source. However, the medium, MSRK5SS-Pr (or MSRK5SM-Pr), that contains $5\textrm{mgL}^{-1}$ kinetin, $0.5\textrm{mgL}^{-1}$ NAA, 2 % sucrose (or maltose), 3% sorbitol, and $500\textrm{mgL}^{-1}$ proline, was the most efficient not only for regeneration of non-transgenic callus but also for regeneration of transgenic callus in the presence of L-phosphinotricin (PPT). Average transformation efficiencies of 16 Korean rice cultivars were significantly enhanced by using the optimized medium from 1.5% to 5.8% in independent callus lines and from 2.9% to 19.4% in tromsgenic plants obained. Approximately 98.9% (876 out of 885) transgenic plants obtained on optimized media showed basta resistance. Stable integration, inheritance and expression of gusA and bar genes were continued by GUS assay and PCR and Southern analysis of the bar gene. With Pst1 digestion of genomic DNA of transgenic plants, one to five copies of T-DNA segment were observed; however, 76% (19 out of 25 transgenic plants) has low copy number of T-DNA. The transformants obtained from one callus line showed the same copy numbers with the same fractionized band patterns.

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