The Korean Journal of Pesticide Science (농약과학회지)

The Korean Society of Pesticide Science (한국농약과학회)
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Diversity and Antimicrobial Activity of Actinomycetes Isolated from Rhizosphere of Rice (Oryza sativa L.)

벼 근권에서 분리한 방선균의 다양성과 항균 활성

  • Lee, Hye-Won (Division of Agricultural Microbiology, National Academy of Agricultural Science, RDA) ;
  • Ahn, Jae-Hyung (Division of Agricultural Microbiology, National Academy of Agricultural Science, RDA) ;
  • Weon, Hang-Yeon (Division of Agricultural Microbiology, National Academy of Agricultural Science, RDA) ;
  • Song, Jaekyeong (Division of Agricultural Microbiology, National Academy of Agricultural Science, RDA) ;
  • Kim, Byung-Yong (Division of Agricultural Microbiology, National Academy of Agricultural Science, RDA)
  • 이혜원 (농촌진흥청 국립농업과학원 농업미생물과) ;
  • 안재형 (농촌진흥청 국립농업과학원 농업미생물과) ;
  • 원항연 (농촌진흥청 국립농업과학원 농업미생물과) ;
  • 송재경 (농촌진흥청 국립농업과학원 농업미생물과) ;
  • 김병용 (농촌진흥청 국립농업과학원 농업미생물과)
  • Received : 2013.11.14
  • Accepted : 2013.12.10
  • Published : 2013.12.31
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Abstract

Various microorganisms live in soil, of which those colonizing rhizosphere interact with nearby plants and tend to develop unique microbial communities. In this study, we isolated diverse actinomycetes from rhizosphere of rice (Oryza sativa L.) cultivated in fertilized (APK) and non-fertilized (NF) paddy soils, and investigated the diversity and antimicrobial activity of them. Using four kinds of selective media, 152 isolates were obtained from the soil samples and identified by determining 16S rRNA gene sequence. All of the isolates showed 99.0%~100.0% similarities with type strains and were classified into six genera: Dactylosporangium, Micromonospora, Kitasatospora, Promicromonospora, Streptomyces and Streptosporangium. Most of the isolates, 143 isolates, were classified into the genus Streptomyces. Additionally, many isolates had antimicrobial activity against plant pathogens, especially Magnaporthe oryzae (rice blast pathogen) in fungi. These findings demonstrated that rice rhizosphere can be a rich source of antagonistic actinomycetes producing diverse bioactive compounds.

토양에 서식하는 다양한 미생물 중에서 식물 근권에 서식하는 미생물들은 식물과 상호작용하며 독특한 군집을 형성한다고 알려져 있다. 본 연구에서는 비료 연용 논토양과 무비 논토양에서 재배된 벼(Oryza sativa L.)의 근권으로부터 배양적 접근을 통해 다양한 방선균을 분리하여 항균활성을 조사하였다. 방선균의 선택적 배양을 위해서 4종류의 선택 배지를 이용하였고, 전체 152균주를 분리할 수 있었다. 분리된 균주들의 분류를 위해서 16S rRNA 유전자의 염기서열을 결정하여 표준균주와의 상동성을 비교하였다. 모든 균주들이 기존에 보고된 표준균주들과 99.0~100.0%의 높은 상동성을 나타내었으며, Dactylosporangium, Micromonospora, Kitasatospora, Promicromonospora, Streptomyces, Streptosporangium 등의 6개 속(genus)로 분류되었다. 그 중 Streptomyces 속에 포함되는 균주가 143균주 (94%)로 가장 많았다. 항균활성을 조사한 결과 대다수의 분리 균주들이 식물병원균에 항균성을 나타내는 것을 확인할 수 있었다. 특히 벼 도열병균(Magnaporthe oryzae)에 우수한 항균활성을 보였다. 이와 같은 연구 결과는, 벼의 근권이 다양한 방선균을 분리할 수 있는 우수한 분리원이며, 분리된 방선균에서 다양한 생리활성 물질을 생산할 수 있음을 제시하여 준다. 또한 추후 연구를 통해 친환경 농업을 위한 유용한 미생물 제제로 활용할 수 있을 것으로 기대한다.

Keywords

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