Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Isolation and Characterization of Antifungal Metabolites from Pterocarpus santalinus against Fusarium graminearum Causing Fusarium Head Blight on Wheat

자단향으로부터 밀 붉은곰팡이병균 Fusarium graminearum에 대한 항진균활성 물질의 분리 및 특성 규명

  • Kim, Ji-In (Department of Agricultural Chemistry, Institute of Environmentally Friendly Agriculture, College of Agriculture and Life Sciences, Chonnam National University) ;
  • Ha, Areum (Department of Agricultural Chemistry, Institute of Environmentally Friendly Agriculture, College of Agriculture and Life Sciences, Chonnam National University) ;
  • Park, Ae Ran (Department of Agricultural Chemistry, Institute of Environmentally Friendly Agriculture, College of Agriculture and Life Sciences, Chonnam National University) ;
  • Kim, Jin-Cheol (Department of Agricultural Chemistry, Institute of Environmentally Friendly Agriculture, College of Agriculture and Life Sciences, Chonnam National University)
  • Received : 2017.08.25
  • Accepted : 2017.09.05
  • Published : 2017.09.30
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Abstract

Fusarium head bight (FHB) is a devastating disease on major cereal crops worldwide which causes primarily by Fusarium graminearum. Synthetic fungicides are generally used in conventional agriculture to control FHB. Their prolonged usage has led to environmental issues and human health problems. This has prompted interest in developing environmentally friendly biofungicides, including botanical fungicides. In this study, a total 100 plant extracts were tested for antifungal activity against F. graminearum. The crude extract of Pterocarpus santalinus heartwood showed the strongest antifungal activity and contained two antifungal metabolites which were identified as ${\alpha}$-cedrol and widdrol by GC-MS analysis. ${\alpha}$-Cedrol and widdrol isolated from P. santalinus heartwood extract had 31.25 mg/l and 125 mg/l of minimal inhibitory concentration against the spore germination of F. graminearum, and also showed broad spectrum antifungal activities against various plant pathogens. In addition, the wettable powder type formulation of heartwood extract of P. santalinus decreased FHB incidence in dose-dependent manner and suppressed the development of FHB with control values of 87.2% at 250-fold dilution, similar to that of chemical fungicide (92.6% at 2,000-fold dilution). This study suggests that the heartwood extract of P. santalinus could be used as an effective biofungicide for the control of FHB.

붉은곰팡이병은 주로 Fusarium graminearum에 의해 발생하며 전세계적으로 주요 곡물에 치명적인 피해를 주는 식물병이다. 관행농가에서는 일반적으로 붉은곰팡이병 방제에 합성살균제를 사용하고 있지만 장기적인 합성살균제의 사용으로 인하여 환경 오염 문제와 인간의 건강을 위협하는 문제가 야기되었다. 때문에 천연물살균제를 포함한 친환경 생물농약 개발에 대한 관심이 고조되고 있는 실정이다. 본 연구에서는 100종의 식물추출물을 이용하여 F. graminearum에 항진균 활성을 갖는 식물 추출물을 탐색하였다. 그 결과 자단 심재부인 자단향의 조추출물이 가장 강한 항진균활성을 보였으며, GC-MS 분석을 통하여 자단향으로부터 ${\alpha}$-cedrol과 widdrol로 동정된 두개의 항진균 활성물질을 분리하였다. ${\alpha}$-Cedrol과 widdrol의 F. graminearum 포자발아 억제활성 최소저해농도는 각각 31.25 mg/l과 62.5 mg/l였으며, 이 두 물질은 F. graminearum 이외에도 다양한 식물병원균의 균사 생육을 저해하였다. 더욱이 자단향 추출물을 분말 수화제로 제형화하여 처리한 결과, 밀 붉은 곰팡이병에 대한 방제효과는 유효성분 농도가 높을수록 효과적인 방제가를 보였으며, 250배 희석처리 시 2,000배의 상용농도로 희석한 합성살균제의 방제가(92.6%)와 통계적으로 유사한 87.2%의 병방제가를 보였다. 본 연구결과는 붉은곰팡이병방제를 위한 효과적인 생물살균제로 자단향 추출물이 활용 가능하다는 것을 제시하고 있다.

Keywords

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