Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Practical Application of Dioscorea quinqueloba Extract for the Control of Citrus Green Mold

감귤 녹색곰팡이병 방제를 위한 천산용 추출물의 실용적 적용

  • Lee, Ji Hyun (Department of Applied Biology, Chungnam National University) ;
  • Kang, Sung Woo (Department of Applied Biology, Chungnam National University) ;
  • Song, Jeong Young (Department of Applied Biology, Chungnam National University) ;
  • Kim, Hong Gi (Department of Applied Biology, Chungnam National University)
  • 이지현 (충남대학교 농업생명과학대학 응용생물학과) ;
  • 강성우 (충남대학교 농업생명과학대학 응용생물학과) ;
  • 송정영 (충남대학교 농업생명과학대학 응용생물학과) ;
  • 김홍기 (충남대학교 농업생명과학대학 응용생물학과)
  • Received : 2012.05.14
  • Accepted : 2012.11.15
  • Published : 2012.12.31
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Abstract

This study tested the antifungal compound obtained from a medicinal plant, Dioscorea quinqueloba Thunb., in order to search the possibility of practical application of this product in agriculture through evaluating its activity using the citrus fruits. The extract of D. quinqueloba Thunb., which has the strongest antifungal activity, was selected as a candidate among 101 plant extracts. Based on this examination concerning antifungal activity of the product on Penicillium digitatum in vitro, it was confirmed its effect of mycelial growth inhibition showed over 87% at 0.5 mg/ml concentration. This natural product showed the stability of the substance, as it was not significantly influenced by pH, temperature, or ultraviolet radiation. While citrus fruits were stored at room temperature, P. digitatum was inoculated into them in order to prepare a similar environmental conditions with epidemic occurrence of the mold. As the result of our investigation, the disease preventive effects of the active antifungal substance evidenced a 100% at 0.5 mg/ml. When the phytotoxicity of the selected natural product on citrus at 2 mg/ml was assessed, we noted no toxic effects. Based on the superior preventive effects from this natural product extracted from the plant, it is presumed to be very useful in agricultural applications for the control of green mold, P. digitatum, which has been occurred often the biggest problem in the storage of citrus fruits.

총 101종의 식물추출물 가운데 약용식물인 천산용(Dioscorea quinqueloba Thunb.) 추출물이 가장 강한 항균활성을 보유한 것으로 나타나 감귤 녹색곰팡이병(Penicillium digitatum) 방제를 위한 실질적인 농업적 현장적용 가능성을 탐색하였다. 선발된 천산용 추출물은 PDA 배지에 0.5 mg/ml을 처리하였을 때, P. digitatum의 균사생장을 87% 억제하였다. 그리고 추출된 항균활성 물질은 pH, 온도, UV에 영향을 받지 않는 매우 안정한 물질임이 확인되었다. 감귤 저장상태 하에서 녹색곰팡이병 방제를 검정한 결과, 자연적인 병발생을 유도한 후 항균활성 물질을 처리하였을 때 0.3 mg/ml에서 완벽하게 병이 방제되었으며 인위적으로 고농도의 P. digitatum을 접종한 경우에도 0.5 mg/ml 농도에서 100%의 방제효과를 보였다. 이 천연 항균물질을 2 mg/ml 농도로 감귤 과실에 처리하여도 약해가 나타나지 않았으므로, 약해가 없고 방제효과가 우수한 이 식물유래 천연물질은 감귤 저장 중에 발생하는 녹색곰팡이병 방제를 위해 추후 매우 효과적인 농업적 활용이 가능할 것으로 판단된다.

Keywords

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