Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Increased Abiotic Stress Tolerance by Over-expressing OsABF2 in Transgenic Arabidopsis thaliana

OsABF2를 과발현시킨 애기장대에서 비생물학적 스트레스에 대한 내성 증가

  • Park, Phun Bum (Department of Bioscience and Biotechnology, University of Suwon)
  • 박훤범 (수원대학교 생명공학과)
  • Received : 2012.09.18
  • Accepted : 2012.11.09
  • Published : 2012.11.30
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Abstract

The phytohormone abscisic acid (ABA) plays an important role in the adaptive response of plants to abiotic stresses. ABA also regulates many important processes, including seed dormancy, germination, inhibition of cell division, and stomatal closure. OsABF2 (Oryza sativa ABRE binding factor2) is one of the bZIP type transcription factors, which are involved in abiotic stress response and ABA signaling in rice. Expression of OsABF2 is induced by ABA and various stress treatments. Findings show that survival rates of OsABF2 over-expressing Arabidopsis lines were increased under drought, salt, and heat stress conditions. The germination ratio of OsABF2 over-expressing Arabidopsis lines was decreased in the presence of ABA. Results indicate that OsABF2 over-expressing Arabidopsis lines have enhanced abiotic stress tolerance and have increased ABA sensitivity.

식물호르몬인 abscisic acid (ABA)는 식물의 비생물학적 스트레스의 적응과정에서 중요한 역할을 수행하고 있다. 또한 ABA는 종자휴면, 발아, 세포분열의 저해, 기공개폐와 같은 중요한 과정에 관여하고 있다. OsABF2(Oryza sativa ABRE Binding Factor2)는 벼에서 비생물학적 스트레스와 ABA 신호전달 과정에 양성적으로 관여하는 bZIP 형태의 전사인자이다. OsABF2 유전자의 발현은 ABA와 다양한 스트레스 처리에 의해 유도된다. 본 논문에서는 OsABF2 유전자를 과발현한 애기장대가 가뭄, 고염, 고온 상태에서의 생존율이 야생형보다 증가하는 것을 확인하였다. 또한 ABA가 존재하는 상황에서 OsABF2 유전자를 과발현한 애기장대의 발아율이 감소하는 것을 확인하였다. 이러한 결과로 미루어 OsABF2 유전자를 과발현한 애기장대는 비생물학적 스트레스에 대한 내성이 증가하고 ABA 감수성은 증가하는 것으로 확인되었다.

Keywords

References

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