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      Characterization of Fe(III)-Reducing Enrichment Cultures and Isolation of Enterobacter sp. Nan-1 from the Deep-Sea Sediment, South China Sea

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          To characterize the Fe(III)-reducing bacteria, enrichment cultures were initiated by inoculating deep-sea sediment from the South China Sea (SCS) into the media with hydrous ferric oxide (HFO) as the sole electron acceptor. As indicated by Meta 16S rDNA Amplicon Sequencing, the microorganisms related to Fe(III)-reduction in the enrichment cultures were mainly Shewanella and Enterobacter. A new facultative Fe(III)-reducing bacterium was obtained and identified as Enterobacter sp. Nan-1 based on its 16S rRNA gene sequence and physiological characterizations. Enterobacter sp. Nan-1 was not only a mesophilic bacterium capable of reducing HFO with a wide range of salinity (4, 34, 40, 50 and 60 g L –1) efficiently, but also a piezotolerant bacterium that can proceed Fe(III)-reduction sustainedly at hydrostatic pressures between 0.1 and 50 MPa using glucose and pyruvate as carbon source. Furthermore, the geochemical characteristics of deep-sea sediment indicated that the microbial metabolism and iron reduction both remain active in the well-developed Fe(III)-reducing zone where the strain Nan-1 was obtained. To our knowledge, Enterobacter sp. Nan-1 could serve as a new applicative Fe(III)-reducing bacterium for future investigation on the iron biogeochemical cycle and diagenetic process of organic matter in the deep-sea environment.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          10 July 2020
          01 August 2020
          : 19
          : 4
          : 818-826
          1Marine Geology & Resources, Ocean College, Zhejiang University, Zhoushan 316021, China
          2Deep Sea Science Division, Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China
          3Zhejiang Institute of Geology and Mineral Rescource, Hangzhou 310007, China
          Author notes
          *Corresponding author: JIN Chong, E-mail: jin-chong@
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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