Korean Journal of Weed Science (한국잡초학회지)

The Korean Society of Weed Science & The Turfgrass Society of Korea Archive (한국잡초학회 & 한국잔디학회)
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Mechanism of Protoporphyrinogen Oxidase-inhibiting Herbicide, Oxyfluorfen Tolerance in Squash leaves of Various Ages

Protoporphyrinogen Oxidase 저해형 제초제 Oxyfluorfen에 대한 호박 엽령별 내성기작

  • Kuk, Yong-In (Dept. of Development in Resources, College of Life Science and Natural Resources, Sunchon National University) ;
  • Yun, Young-Beom (Dept. of Development in Resources, College of Life Science and Natural Resources, Sunchon National University)
  • 국용인 (순천대학교 생명산업과학대학 자원식물개발학과) ;
  • 윤영범 (순천대학교 생명산업과학대학 자원식물개발학과)
  • Received : 2010.05.28
  • Accepted : 2010.06.23
  • Published : 2010.06.30
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Abstract

Differential tolerance to protoporphyrinogen oxidase (Protox)-inhibiting herbicides, oxyfluorfen was observed between leaf ages in squash. Physiological responses to oxyfluorfen, including leaf injury, cellular leakage, accumulation of tetrapyrroles, and antioxidative enzymes activity, were investigated in leaf age classes of squash to identify mechanisms of oxyfluorfen tolerance. Leaf 1, 2, and 3 injuries for Joongangaehobak were >10,000, 1,286, and 1.6-fold higher than that of leaf 4, after treatment of oxyfluorfen. On the other hand, leaf 1, 2, and 3 injuries for Sintowjahobak were 725, 366, and >0.6-fold higher than that of leaf 4, after treatment of oxyfluorfen. However, in contrast to oxyfluorfen treatment results, leaf injury of squash leaf 4 treated with paraquat was much smaller than in leaves 1, 2 and 3. Electrolyte leakage from the tissues treated with oxyfluorfen was higher in the youngest leaf (Leaf 4) than in the older leaves 1, 2, and 3. Differential leaf response to oxyfluorfen of squash appears to be due in large part to differences in protoporphyrin IX (Proto IX), Mg-Proto IX, and Mg-Proto IX monomethyl ester accumulation in treated leaves. In contrast, leaf 4 had higher activities of superoxide dismutase, catalase, peroxidase, ascorbate peroxidase, and glutathione reductase than leaf 1 after treatment with oxyfluorfen. However, the induction in antioxidant activity in leaf 4 was not enough to overcome the toxic effects of a Protox inhibitor, oxyfluorfen, so the leaf eventually died.

Protoporphyrinogen oxidase(Protox) 저해형 제초제인 oxyfluorfen에 대한 내성차이는 동일 개체내의 호박 엽령에서 관찰되었다. 엽위별 oxyfluorfen에 내성기작을 구명하기 위해 잎의 피해정도, 세포내 구성물질의 누출, 포르피린 생합성 경로의 tetrapyrrole 중간물질 축적량 및 항산화효소 활성을 포함한 생리적 반응을 조사하였다. 중앙애호박의 1, 2 및 3엽에 대한 oxyfluorfen에 내성은 4엽에 비해 각각 >10,000, 1,286 및 1.6배 높았고, 신토좌의 1, 2 및 3엽에 대한 oxyfluorfen에 내성은 4엽에 비해 각각 725, 366, >0.6배 높았다. 그러나 oxyfluorfen과 작용기작이 다른 paraquat 처리에서는 oxyfluorfen 처리의 결과와 다르게 두 품종 모두 상위엽인 4엽이 하위엽인 1, 2 및 3엽에 비해 훨씬 피해가 적었다. Oxyfluorfen 처리에 따른 전해물질의 누출은 처리 후 광노출 기간이 경과할수록 상위엽(4엽)에서 하위엽(1, 2, 3엽) 보다 많았다. Oxyfluorfen 처리에 의한 tetrapyrrole 중간물질 protoporphyrin IX(Proto IX), Mg-Proto IX 및 Mg-Proto IX monomethyl ester의 축적량은 감수성인 4엽이 내성인 1엽에 비해 많았다. 따라서 oxyfluorfen 처리에 대한 호박 엽령별 반응 차이는 tetrapyrrole 중간물질의 과다한 축적에 의해 기인되는 것으로 생각된다. Tetrapyrrole 중간 물질 축적량의 결과와 다르게 항산화효소 superoxide dismutase, catalase, peroxidase, ascorbate peroxidase 및 glutathione reductase 활성은 무처리 및 oxyfluorfen 처리 후 4엽이 1엽에 비해 높았다. 그러나 4엽에서 항산화효소 활성 유도는 Protox 저해제 oxyfluorfen의 독성효과를 극복하는데 충분하지 않아 결국 4엽은 고사하게 되는 것으로 생각된다.

Keywords

References

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