Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Isolation and Characterization of Various Strains of Bacillus sp. having Antagonistic Effect Against Phytopathogenic Fungi

식물 병원성 곰팡이에 길항작용을 갖는 다양한 Bacillus sp.의 균주 분리와 특성에 관한 연구

  • 김희숙 ((주)엔젤 식품연구소) ;
  • 김지윤 ((주)엔젤 식품연구소) ;
  • 이송민 ((주)엔젤 식품연구소) ;
  • 박혜정 ((주)엔젤 식품연구소) ;
  • 이상현 (신라대학교 바이오산업학부 제약공학전공) ;
  • 장정수 ((주)엔젤 식품연구소) ;
  • 이문현 ((주)엔젤 식품연구소)
  • Received : 2019.04.01
  • Accepted : 2019.06.03
  • Published : 2019.12.28
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Abstract

This study was carried out to examine the antagonistic effect against phytopathogenic fungi of isolated strains from soil samples collected from Busan, Changwon, and Jeju Island: Botrytis cinerea, Colletotrichum acutatum, Corynespora cassiicola, Fusarium sp., Rhizoctonia solani, Phytophthora capsici, and Sclerotinia sclerotiorum. According to results of our studies, isolated strains showed an antagonistic effect against phytopathogenic fungi. Such an antagonistic effect against phytopathogenic fungi is seen due to the production of siderophores, antibiotic substances, and extracellular amylase, cellulase, protease, and xylanase enzyme activities. Extracellular enzymes produced by isolated strains were significant, given that they inhibited the growth of phytopathogenic fungi by causing bacteriolysis of the cell wall of plant pathogenic fungi. This is essential to break down the cell wall of plant pathogenic fungi and thus help plant growth by converting macromolecules, which cannot be used by the plant for growth, into small molecules. In addition, they are putative candidates as biological agents to promote plant growth and inhibit growth of phytopathogenic fungi through nitrogen fixation, indole-3-acetic acid production, siderophore production, and extracellular enzyme activity. Therefore, this study suggests the possibility of using Bacillus subtilis ANGa5, Bacillus aerius ANGa25, and Bacillus methylotrophicus ANGa27 as new biological agents, and it is considered that further studies are necessary to prove their effect as novel biological agents by standardization of formulation and optimization of selected effective microorganisms, determination of their preservation period, and crop cultivation tests.

본 연구에서 부산, 창원, 제주도 일대에서 채취한 토양으로부터 분리한 균주를 이용하여 식물 병원성 곰팡이에 대해서 길항작용을 나타내는 것을 확인하였으며, 또한 분리 균주의 경우 세균성 균주에 대해서도 길항작용을 나타내는 것을 확인하였다. 이러한 길항작용은 Bacillus 속이 생산하는 2차 대사산물인 siderophore, 항생물질, 세포 외 효소 활성 등에 의해서 식물 병원성 곰팡이에 대한 길항작용을 나타내는 것으로 보이며, 특히 분리 균주로부터 생산되는 세포 외 효소는 식물 병원성 곰팡이의 세포벽에 용균작용 일으킴에 따라 세포벽을 분해하여 식물 병원성 곰팡이의 생장을 저해할 것으로 생각된다. 또한 질소 고정능 및 IAA 생성능을 통해 식물 생장 촉진 및 식물 병원성 곰팡이 성장을 억제시킬 수 있는 생물학적 제제로서 식물재배에 도움을 줄 것으로 기대된다. 최종 선별된 Bacillus subtilis ANGa5, Bacillus aerius ANGa25, Bacillus methylotrophicus ANGa27를 이용하여 식물 병원성 곰팡이 방제 및 식물 생장촉진활성을 가지는 새로운 생물학적 제제로서 이용 가능성을 제시한다.

Keywords

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