Journal of Plant Biotechnology

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Investigation of Transformation Efficiency of Rice Using Agrobacterium tumefaciens and High Transformation of GPAT (glycerol-3-phosphate acyltransferase) Gene Relative to Chilling Tolerance

Agrobacterium tumefaciens를 이용한 벼의 형질전환 효율의 검토 및 내한성 관련 GPAT (glycerol-3-phosphate acyltransferase) 유전자의 형질전환

  • Seo, Mi-Suk (College of Agricultural & Life Science, Cunchon National University) ;
  • Bae, Chang-Hyu (College of Agricultural & Life Science, Cunchon National University) ;
  • Choi, Dae-Ock (College of Natural Science, Sunchon National University) ;
  • Rhim, Seong-Lyul (College of Natural Science, Hallym University) ;
  • Seo, Suk-Chul (National Agricultural Science and Technology Institute, RDA) ;
  • Song, Pill-Soon (Kumho Life and Environmental Science Laboratory) ;
  • Lee, Hyo-Yeon (College of Agricultural & Life Science, Cunchon National University)
  • Published : 2002.06.01
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Abstract

This study has been focused on improving transformation efficiency of rice using Agrobacterium tumefaciens. We have demonstrated the effect of this system when the GPAT gene related to the cold-resistance was transferred by Agrobacterium tumefaciens in rice. Transformation conditions were modified using intron $\beta$-glucuronidase (GUS) expression as a reporter gene in the rice. In this study, mature seed-derived calli of rice (Oruza sativa L. cv. Dongjin) were pre-cultured for 3 days and then infected with Agrobacterium. When this infected calli were cultured in the dark for 10 days on co-cu]lure medium containing 50 mg/L of CaCl$_2$, 30 mg/L of acetosyringone, 2 mg/L of 2,4-D, 120 mg/L of betaine, high GUS expression was observed. In the present transformation system, the efficiency of transformation of GPAT gene was about 54%. Stable integration of GPAT gene into chromosomal DNA was proven by southern blot analysis of genomic DNA isolated from T$_{0}$ progenies. The progenies (T1 generation) derived from primary transformant of 5 lines were segregated with a 3 (resistant) : 1 (sensitive ratio) in medium containing hygromycin. This high frequency transformation system can be used as a useful tool in transformation of another monocotyledon.n.

Agrobacterium을 이용한 벼의 효율적인 형질전환을 위하여 몇 가지 형질전환 조건을 조사하였다. 그리고 조사된 최적의 형질전환 방법을 이용하여 내한성에 관련된 GPAT 유전자를 식물에 도입하였다. 형질전환 조건은 GUS 발현을 통하여 조사되었다. 본 실험에서는 벼 (Oryza sativa L. cv. Dongjin)의 성숙 종자 유래 캘러스를 3일간 전배양한 후 Agrobacterium을 접종하였다. 접종이 끝난 캘러스는 50mg/L CaCl$_2$, 30mg/L acetosyringone, 2 mg/L 2,4-D, 120 mg/L betaine이 첨가된 공동배양 배지 위에서 암조건으로 10일간 공동배양하여 높은 GUS 발현을 관찰할 수 있었다. 이와 같은 방법으로 GPAT 유전자를 식물에 도입한 결과 54%의 높은 형질전환율을 나타내었다. 형질전환 식물체를 southern 분석한 결과 wild type 식물체에서는 GPAT 유전자가 검출되지 않았으나, 형질전환 식물체에서는 GPAT 유전자가 검출되었다. 또한 GPAT 유전자로 형질전환된 5 계통의 T1 세대에서 hygromycin에 대한 저항성과 감수성의 유전비율이 3 : 1로 분리되었다. 따라서 본 실험의 결과에서 검토된 고빈도의 형질전환 시스템은 단자엽식물의 형질전환에 있어서 모델계로 이용될 수 있으리라 기대된다.

Keywords

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