Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Isolation and characterization of antifungal violacein producing bacterium Collimonas sp. DEC-B5

항진균활성 violacein 색소를 생산하는 Collimonas sp. DEC-B5 균주의 분리 및 특성

  • Lee, Ye-Rim (Department of Microbial & Nano Materials, College of Science & Technology, Mokwon University) ;
  • Mitchell, Robert J. (School of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science and Technology) ;
  • Whang, Kyung-Sook (Department of Microbial & Nano Materials, College of Science & Technology, Mokwon University)
  • 이예림 (목원대학교 미생물나노소재학과) ;
  • ;
  • 황경숙 (목원대학교 미생물나노소재학과)
  • Received : 2016.06.10
  • Accepted : 2016.06.27
  • Published : 2016.06.30
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Abstract

Forty-nine pigments were extracted from the collections of 106 pigment producing bacteria from the plant rhizosphere soil. Antibacterial activity test was performed in the subjects of the extracted pigments with plant pathogenic bacteria including Xanthomonas axonopodis and Xanthomonas campestris, and with plant pathogenic fungi including Botrytis cinerea, Colletotrichum acutatum, and Fusarium oxysporum. The yellow pigment by Chryseobacterium sp. RBR9 and the red pigment by of Methylobacterium sp. RI13 showed the antibacterial activities against Xanthomonas axonopodis and Xanthomonas campestris. The violet pigment by Collimonas sp. DEC-B5 showed the antibacterial activity as well as the antifungal activities against Botrytis cinerea and Fusarium oxysporum. Especially, the violet pigment inhibited the growth of Botrytis cinerea more than 65% at MIC $20{\mu}M$. Upon the HPLC analysis result for the isolation of pigment with antifungal activity, violacein (91.6%) and deoxyviolacein (8.4%) were isolated for the pigment by Collimonas sp. DEC-B5. The production amount of the pigment was increased more than 10 times higher when D-mannitol 1.5% and yeast extract 0.2% were added as the nitrogen source to SCB medium. This study suggests that produced violacein by Collimonas sp. DEC-B5 will be effective to control strawberry gray-mold rot fungi by its preventive activity.

식물 근권 토양으로부터 색소생성 균주 106균주를 수집하여 색소 생성능이 우수한 균주로부터 노란색(33개), 주황색(12개), 분홍색, 빨간색, 갈색 그리고 보라색 총 49개의 세균색소를 추출하였다. 식물병원균에 대한 항균활성능이 우수한 색소를 선발하기 위하여 고추점무늬병원균(Xanthomonas axonopodis), 흑마병원균(Xanthomonas campestris)과 딸기잿빛곰팡이병원균(Botrytis cinerea), 고추탄저병원균(Colletotrichum acutatum), 그리고 시들음병원균(Fusarium oxysporum)을 대상으로 항균활성 검정을 수행하였다. 색소생성 Chryseobacterium sp. RBR9 균주가 생산하는 노란색 색소와 Methylobacterium sp. RI13 균주가 생산하는 빨간색 색소는 X. axonopodis와 X. campestris에 항세균 활성을 나타내었다. 차나무 토양으로부터 분리된 Collimonas sp. DEC-B5가 생산하는 보라색 색소는 항세균 활성과 더불어 B. cinerea와 Colletotrichum acutatum에 항진균활성을 나타내었다. 특히, 보라색 색소는 최소저해 농도 $20{\mu}M$에서 B. cinerea를 65% 이상 생육 저해하였다. 항진균활성 보라색 색소를 HPLC 분석한 결과, violacein (91.6%)와 deoxyviolacein(8.4%)으로 동정되었다. 보라색 색소 violacein의 생산량은 SCB 배지에서 $43.2{\mu}M$이었고 D-mannitol 1.5%, yeast extract 0.2%를 첨가한 경우 $431.6{\mu}M$로 약 10배 높은 색소 생성량을 나타내었다. 본 연구에서 분리된 Collimonas sp. DEC-B5가 생산하는 violacein 색소는 딸기잿빛곰팡이병원균 방제제로 활용 가능성이 확인되었다.

Keywords

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