식물조직배양학회지 (Korean Journal of Plant Tissue Culture)

한국식물생명공학회 (The Korean Society of Plant Biotechnology)
권호 표지

Agrobacterium tumefaciens를 이용한 bialaphos 저항성 형질전환 벼의 개발

Development of Bialaphos-Resistant Transgenic Rice Using Agrobacterium tumefaciens

  • 이효연 (순천대학교 농과대학) ;
  • 이춘환 (부산대학교 분자생물학과) ;
  • 김호일 (농촌진흥청 농업과학기술원 생물자원부) ;
  • 한원동 (순천대학교 자연과학대학) ;
  • 최지은 (순천대학교 자연과학대학) ;
  • 김진호 (순천대학교 농과대학) ;
  • 임용표 (충남대학교 농과대학)
  • 발행 : 1998.07.01
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초록

비선택성 제초제인 bialaphos는 고등식물에 있어서 glutamine 합성을 억제 하여 식물체를 고사시킨다. Acetyltransferase에 의해 encoding된 bialaphos저항성 유전자는 세균 Streptomyces hygroscopicus SF1239로부터 cloning된것을 사용하였다. Bialaphose 저항성 유전자를 Agrobacterium 감염법을 이용하여 국내에서 재배되는 벼(동진)에 도입한 결과 약30%정도의 형질전환 식물체를 얻을 수 있었다. $\textrm{T}_{1}$ 세대의 17개체는 hygromycin과 bialaphos에 대한 저항성 유전형질이 3:1로 분리되었다. 또한 Southern 분석을 실시한 결과 wild type의 식물체에서는 Bar 유전자의 검출을 볼 수 없었으나 형질전환 식물체의 경우 Bar 유전자의 검출이 가능하였다. $\textrm{T}_{3}$세대의 형질전찬 식물체와 wild type의 식물체를 포장상태에서 비선택성 제초제인 바스타를 살포하고 3주 후에 관찰한 결과 형질전환 식물체는 외형적으로 아무런 피해를 받지 않고 정상적으로 생장하였으나, wild type의 식물체와 잡초는 모두 고사하였다. 이상의 결과를 종합해보면 hygromycin과 bialaphos 저항성 유전자는 Agrobacterium감염법을 이용하여 단자엽 식물인 벼에 도입할 수 있다는 것을 보여준 것이며, 또한 bialaphos 저항성 유전자가 식물에 도입됨으로써 비선택성 제초제에 대한 저항성 식물을 개발 할 수 있다는 것을 보여 주었다.

The bialaphos is a potent inhibitor of glutamine synthease in higher plants and is used as a non-selective herbicide. We have used the bialaphos resistant gene(Bar) encoding for an acetyltransferase isolated from Streptomyces hygroscopicus SF1293. Callus derived from mature seeds of rice(Oryza sativa L. cv. Dong Jin) were co-cultivated with Agrobacterium tumefaciens EHA101 carring a plasmid pGPTV-HB containing genes for hygromycin resistance (HygR) and Bar. Transgenic plants showing in vitro resistance to 50 mg/L hygromycin and 10 mg/L bialaphos were obtained by using a two-step selection/regeneration procedure. Transformation efficiency of rice was about 30% which was as high as reported in other dicotyledons. Progenies ($\textrm{T}_{1}$ generation) derived from primary transformant of 17 lines were segregated with a 3 resistant : 1 sensitive ratio in medium containing hygromycin and bialaphos. Stable integration of Bar gene into chromosomal DNA was proven by Southern blot analysis of genomic DNA isolated from $\textrm{T}_{2}$ progenies. Transgenic plants ($\textrm{T}_{3}$) grown in the field were resistant to bialaphos (Basta) at a dosage lethal to wild type plants.

키워드

참고문헌

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