Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Plant Growth Promoting and Disease Controlling Activities of Pseudomonas geniculata ANG3, Exiguobacterium acetylicum ANG40 and Burkholderia stabilis ANG51 Isolated from Soil

토양에서 분리한 Pseudomonas geniculata ANG3, Exiguobacterium acetylicum ANG40 및 Burkholderia stabilis ANG51의 식물 생장촉진 활성 및 식물병 방제활성

  • Received : 2019.06.04
  • Accepted : 2019.06.20
  • Published : 2020.03.28
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Abstract

This study was conducted to investigate both plant growth-promoting and plant disease- controlling activities of bacterial strains isolated from soil. All the isolated strains were able to grow at various temperatures. All the strains, except ANG40, showed antagonistic effects against various phytopathogenic fungi. This antagonism can be ascribed to the production of siderophores and antibiotic substances. In addition, all the strains showed abilities such as nitrogen fixation, phosphate solubilization, and siderophore production. These results suggest that nitrogen, phosphorus, and iron can be converted into forms that can be easily absorbed by the plants for their growth. Analysis of the growth-promoting properties revealed that ANG51 produced 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase and indole-3-acetic acid (IAA) both of which are related to ethylene production. In contrast, the other strains were found to have only IAA-producing ability. Therefore, this study suggests that Pseudomonas geniculata ANG3, Exiguobacterium acetylicum ANG40, and Burkholderia stabilis ANG51, which were selected through analysis of comparative advantages for both plant growth promotion and disease-controlling activity, may be used as biological agents.

본 연구는 토양으로부터 분리한 균주를 대상으로 식물병 방제활성 및 식물 생장촉진 활성을 확인하고자 하였다. 식물병원성 곰팡이에 대한 길항능을 통해 방제기능을 확인할 수 있었으며, 이는 siderophore 및 항생물질 생성 등에 기인되는 것으로 판단된다. 또한 ANG40의 경우에는 amylase, cellulase, xylanase와 같은 세포외 효소활성을 갖고 있음을 확인하였다. 이 외에도 질소 고정능, 인산 가용화능, siderophore 생성능 등 다양한 실험을 통해 식물 생장에 필수적인 질소, 인, 철 등을 식물이 흡수 가능한 형태로 변화시켜 식물 생장에 도움을 줄 수 있을 것으로 기대된다. 또한 6종의 분리균주는 모두 에틸렌 생성과 연관된 IAA를 생성하였으며, 그 중에서도 ANG51의 경우에는 ACC deaminase 활성도 갖고 있음을 확인하였다. 따라서, 최종 선별된 Pseudomonas geniculata ANG3, Exiguobacterium acetylicum ANG40, Burkholderia stabilis ANG51을 이용하여 식물 생장촉진 활성과 식물 병원성 곰팡이에 항진균 활성을 갖는 새로운 생물학적 제제로써 이용 가능성을 제시하였다.

Keywords

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