한국미생물·생명공학회지 (Microbiology and Biotechnology Letters)

  • 제49권3호
  • /
  • Pages.413-424
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  • 2021
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  • 1598-642X(pISSN)
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  • 2234-7305(eISSN)
한국미생물·생명공학회 (The Korean Society for Microbiology and Biotechnology)
권호 표지
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DOI QR Code

중금속 및 디젤 오염 토양에서 분리한 중금속 내성 식물 생장 촉진 근권세균의 특성

Characterization of Heavy Metal Tolerant and Plant Growth-Promoting Rhizobacteria Isolated from Soil Contaminated with Heavy Metal and Diesel

  • 이수연 (이화여자대학교 환경공학과) ;
  • 이윤영 (이화여자대학교 환경공학과) ;
  • 조경숙 (이화여자대학교 환경공학과)
  • Lee, Soo Yeon (Department of Environmental Science and Engineering, Ewha Womans University) ;
  • Lee, Yun-Yeong (Department of Environmental Science and Engineering, Ewha Womans University) ;
  • Cho, Kyung-Suk (Department of Environmental Science and Engineering, Ewha Womans University)
  • 투고 : 2021.06.26
  • 심사 : 2021.08.05
  • 발행 : 2021.09.28
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초록

식물과 근권미생물을 이용해 토양 오염물질을 제거하는 rhizoremediation의 효율을 높이기 위해서는 오염물질을 제거함과 동시에 식물 생장을 촉진시키는 미생물 자원 개발이 필요하다. 본 연구에서는 중금속 및 유류 복합 오염 토양에서 서식하고 있는 옥수수와 톨페스큐의 근권으로부터 중금속(구리, 카드뮴 및 납) 내성을 가진 근권세균을 순수분리하였고, 식물 생장 촉진능, 중금속 내성능 및 디젤 분해능을 정성적으로 평가하였다. 그 결과 중금속 내성, 식물 생장 촉진 활성 및 디젤 분해능을 가진 6종의 균주를 분리하였다. 옥수수 근권에서 분리한 CuM5와 CdM2 균주는 Cupriavidus sp.로 동정되었다. 톨페스큐 근권에서 분리한 CuT6, CdT2, CdT5 및 PbT3는 각각 Fulvimonas soli, Cupriavidus sp., Novosphingonium sp. 및 Bacillus sp.로 동정되었다. Cupriavidus sp. CuM5와 CdM2는 중금속 내성과 디젤 분해능은 상대적으로 낮았으나, 식물 생장 촉진능이 상대적으로 우수하였다. 6종 중에서 디젤 분해능이 가장 우수한 균주는 Cupriavidus sp. CdT2와 Bacillus sp. PbT3이었다. 특히, Bacillus sp. PbT3는 3종의 중금속에 대해 상대적으로 우수한 내성을 가졌고 식물 생장 촉진능도 우수하였다. 본 연구에서 분리한 근권세균은 유류와 중금속 복합 오염 토양을 정화시키며 식물 생장을 촉진시키는 새로운 미생물 자원으로 활용 가능하다.

In order to enhance rhizoremediation performance, which remediates contaminated soils using the interactions between plants and microorganisms in rhizosphere, it is required to develop effective microbial resources that simultaneously degrade contaminants and promote plant growth. In this study, heavy metal-resistant rhizobacteria, which had been cultivated in soils contaminated with heavy metals (copper, cadmium, and lead) and diesel were isolated from rhizospheres of maize and tall fescue. After that, the isolates were qualitatively evaluated for plant growth promoting (PGP) activities, heavy metal tolerance, and diesel degradability. As a result, six strains with heavy metal tolerance, PGP activities, and diesel degradability were isolated. Strains CuM5 and CdM2 were isolated from the rhizosphere soils of maize, and were identified as belonging to the genus Cupriavidus. From the rhizosphere soils of tall fescue, strains CuT6, CdT2, CdT5, and PbT3 were isolated and were identified as Fulvimonas soli, Cupriavidus sp., Novosphingobium sp., and Bacillus sp., respectively. Cupriavidus sp. CuM5 and CdM2 showed a low heavy metal tolerance and diesel degradability, but exhibited an excellent PGP ability. Among the six isolates, Cupriavidus sp. CdT2 and Bacillus sp. PbT3 showed the best diesel degradability. Additionally, Bacillus sp. PbT3 also exhibited excellent heavy metal tolerance and PGP abilities. These results indicate that the isolates can be used as promising microbial resources to promote plant growth and restore soils with contaminated heavy metals and diesel.

키워드

과제정보

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2019R1A2C2006701).

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