Korean Journal of Weed Science (한국잡초학회지)

The Korean Society of Weed Science & The Turfgrass Society of Korea Archive (한국잡초학회 & 한국잔디학회)
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Expression Site of Protoporphyrinogen Oxidase Influences on Herbicide Resistance in Transgenic Rice

형질전환 벼에서 Protoporphyrinogen Oxidase의 발현 위치가 제초제 저항성에 미치는 영향

  • Jung, Sun-Yo (School of Life Sciences and Biotechnology, Kyungpook National University)
  • 정선요 (경북대학교 생명공학부)
  • Received : 2010.08.23
  • Accepted : 2010.09.24
  • Published : 2010.09.30
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Abstract

The effect of Protox expression site on herbicidal resistance was investigated in wild-type and transgenic rice plants imposed by peroxidizing herbicide oxyfluorfen. The transgenic rice systems involved the plastidal expression of Arabidopsis protoporphyrinogen oxidase (Protox; AP line) and the dual expression of Myxococcus xanthus Protox in chloroplasts and mitochondria (TTS line). The oxyfluorfen-treated TTS4 line showed the lower levels of cellular leakage and malonyldialdehyde and the sustained capacity of 5-aminolevulinic acid synthesis, compared to the oxyfluorfen-treated AP and wild-type lines. During oxyfluorfen action, the TTS4 line had greater herbicide resistance than the AP1 line, indicating that the dual expression of M. xanthus Protox in chloroplasts and mitochondria prevented the accumulation of photodynamic protoporphyrin IX more effectively than the expression of Arabidopsis Protox only in chloroplasts. These results suggest that the ectopic expression of Protox in mitochondria greatly contributes to the herbicidal resistance in rice plants.

과산화계 제초제 oxyfluorfen이 처리된 비형질전환 벼와 형질전환 벼에서 Protox 발현 위치가 제초제 저항성에 미치는 영향을 비교하였다. Arabidopsis protoporphyrinogen oxidase(Protox; AP 계통)를 색소체에만 발현하는 형질전환 벼와 Myxococcus xanthus Protox 유전자를 색소체와 미토콘드리아에 모두 발현하는 형질전환 벼(TTS 계통)가 형질전환 시스템으로 사용되었다. Oxyfluorfen이 처리된 TTS4 계통은 AP 계통이나 비형질전환 벼에 비해 낮은 수준의 세포질 누출 및 malonyldialdehyde를 보여주었고, 높은 5-aminolevulinic acid 합성 능력을 유지하였다. Oxyfluorfen 작용 동안, TTS4 계통은 AP1 계통보다 높은 제초제 저항성을 보여주었는데, 이는 색소체만에서의 Arabidopsis Protox의 발현에 비해 색소체와 미토콘드리아에서의 M. xanthus Protox의 쌍발현이 광역학적인 protoporphyrin IX의 축적을 더 효율적으로 억제하였기 때문일 것이다. 이 결과들은 미토콘드리아 내 Protox의 발현이 Protox 저해형 제초제에 대한 식물의 저항성에 크게 기여함을 의미한다.

Keywords

References

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