Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Biodiversity and Phylogenetic Analysis of Streptomyces Collected from Bamboo Forest Soil

대나무 산림토양으로부터 수집한 Streptomyces 속 방선균의 계통학적 다양성

  • Lee, Hyo-Jin (Department of Microbial & Nano Materials, Mokwon University) ;
  • Whang, Kyung-Sook (Department of Microbial & Nano Materials, Mokwon University)
  • 이효진 (목원대학교 미생물나노소재학과) ;
  • 황경숙 (목원대학교 미생물나노소재학과)
  • Received : 2010.08.05
  • Accepted : 2010.09.17
  • Published : 2010.09.30
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Abstract

To investigate a quantitative evaluation of the actinobacteria, we have collected samples from various kinds of bamboo forest soil. Each different layers contained $2.7{\times}10^6-2.7{\times}10^8$ CFU/g of actinobacteria which was the highest in litter layers of Sasa boreali forest soil. We obtained 330 actinobacteria from different layers of bamboo forest soil; litter (100 strains), humus (70 strains), and rhizosphere soil (160 strains). Based on the colony morphology (aerial mycelium, substrate mycelium, and soluble pigment), isolates were divided into thirty-six groups and we selected 50 representative isolates. 16S rRNA gene sequence analysis showed Streptomyces was major actinobacteria (94%) and they were categorized as cluster I (2 strains), II (35 strains), III (6 strains), and IV (7 strains), respectively. The diversity index of 50 Streptomyces collected from the bamboo forest soil was calculated with the Shannon-Wiener method. Bamboo litter showed higher diversity index level of 3.33 than that of humus and rhizosphere soil. Also, antibiotic activities of our isolates were investigated against Botrytis cinerea, Xanthomonas campestris, Xanthomonas axonopodis pv. vesicatoria, and Bacillus cereus and found in 74, 16, 25, and 24 strains, respectively.

국내 자생하는 왕대, 분죽, 조릿대, 호마죽과 같은 다양한 대나무 산림토양의 낙엽층, 부식층, 근권토양 내 방선균 밀도 측정 결과, $2.7{\times}10^6-2.7{\times}10^8$ CFU/g로 계수되었으며, 특히 조릿대 낙엽층 내에는 $2.7{\times}10^8$ CFU/g의 매우 높은 밀도로 분포하였다. 본 연구에서는 대나무림 낙엽층으로부터 100균주, 부식층으로부터 70균주 그리고 근권토양으로부터 160균주로 총 330균주의 방선균을 수집하였다. 이들 분리된 균주들의 기균사, 기중균사 및 색소형성 등을 관찰한 결과 36개 방선균 군집으로 분류되었다. 각 그룹으로부터 대표 방선균 50균주를 선발하여 16S rRNA 유전자 염기서열을 해석하고 계통학적 위치를 검토한 결과, 94%가 Streptomyces 속에 속하였으며, cluster I (2균주), II (35균주), III (6균주), 그리고 IV (7균주)에 속하는 특징을 나타내었다. 대나무 산림토양으로부터 수집된 Streptomyces 속 방선균 50균주를 Shannon-Wiener법에 의해 다양성 지수를 산출한 결과, 대나무림 낙엽층으로부터 수집된 방선균의 다양도는 3.33으로 부식층과 근권토양 보다 높게 나타났으며, 근권토양으로부터 수집된 방선균의 88%가 cluster II에 속하는 특징을 나타내었다. 본 연구에서 수집한 방선균을 Botrytis cinerea, Xanthomonas campestris 그리고 Xanthomonas axonopodis pv. vesicatoria에 대해 항균활성능을 검토한 결과, 각 74균주, 16균주, 25균주 그리고 24균주가 항균활성능을 나타내었다.

Keywords

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