Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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A Unique Prokaryotic Assemblage of Wall Biofilm of a Volcanic Cave (Daesubee) in Jeju

제주도 용암동굴 대섭이굴 미생물 막의 독특한 원핵미생물 군집

  • Received : 2013.04.08
  • Accepted : 2013.05.30
  • Published : 2013.06.30
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Abstract

Cave environment provides special ecosystems for evolution of lives distant from surface environments. We investigated bacterial and archaeal communities of wall biofilm obtained from of a volcanic cave (Daesubee) in Jeju, Republic of Korea. Bacterial and archaeal 16S rRNA genes were PCR-amplified and sequenced using pyrosequencing technologies. Unique prokaryotic communities with low diversities were observed. The main bacterial sequences (ca. 83% of total reads) were affiliated with Pseudonocardia mongoliensis of phylum Actinobacteria and clustered with clones obtained from various caves. Reflection of light on the wall surface of cave might be caused by formation of beads of water caused by hydrophobic filaments of actinobacterial colonies. Main archaeal sequences (ca. 65.7% of total reads) were related with those of I.1a-Associated group of phylum Thaumarchaeota. The sequences were related with that of Candidatus Nitrosotalea devanaterra which was known to oxidize ammonia under acidic condition (ca. pH 5.0). Nutrients leached through volcanic soils contribute formation of unique microbial communities of wall biofilm of cave Daesubee.

동굴환경은 표면 토양환경과는 다른 독특한 생태계를 이루는 것으로 알려져 있다. 본 연구를 통하여 제주도 용암동굴(대섭이굴)의 생물막(biofilm)으로부터 얻은 시료를 pyrosequencing 기술을 통해 16S rRNA 유전자를 증폭하여 세균과 고세균의 군집을 조사하였다. 생물막에 우점하는 세균은 Actinobacteria문(phylum)의 Pseudonocardia mongoliensis (전체 세균 reads수의 82.5%)와 깊은 근연관계가 있었으며, 동굴유래의 다양한 세균들과 같이 무리(cluster)를 형성하였다. 동굴 벽면에 빛을 조사하였을 때 반사되어 빛나는 것은 아마도 방선균의 균사(hypha)들로 이루어진 생물막이 수분을 흡수하지 못하기 때문으로 추정된다. 우점하는 고세균은 Thaumarchaeota문의 I.1a-Associated group (전체 archaeal reads수의 약 66%)에 속한다. 이 고세균 염기서열은 산성 환경(약 pH 5.0)에서 암모니아를 산화하는 고세균으로 알려진 Candidatus Nitrosotalea devanaterra와 높은 근연관계에 있어 동굴환경에서의 질산화에 중요한 기능을 하고 있을 것으로 추정된다. 표층수가 용암토양을 투과하는 과정에서 침출(Leaching)되는 영양분이 대섭이굴 벽면에 다양성이 낮은 독특한 미생물 군집을 형성하는데 기여하고 있는 것으로 추정된다.

Keywords

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