Characteristics of different iron oxides reduction by a thermophilic dissimilatory iron reducing bacterium <i>Caloranaerobacter ferrireducens</i> DY22619<sup>T</sup> from deep sea

Li Xi; Zeng Xiang; Zhang Zhao; Shao Zongze

doi:10.3969/j.issn.0253-4193.2016.08.009

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Li Xi, Zeng Xiang, Zhang Zhao, Shao Zongze. Characteristics of different iron oxides reduction by a thermophilic dissimilatory iron reducing bacterium Caloranaerobacter ferrireducens DY22619T from deep sea[J]. Haiyang Xuebao, 2016, 38(8): 83-92. doi: 10.3969/j.issn.0253-4193.2016.08.009

Citation:

Li Xi, Zeng Xiang, Zhang Zhao, Shao Zongze. Characteristics of different iron oxides reduction by a thermophilic dissimilatory iron reducing bacterium Caloranaerobacter ferrireducens DY22619^T from deep sea[J]. Haiyang Xuebao, 2016, 38(8): 83-92. doi: 10.3969/j.issn.0253-4193.2016.08.009

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Characteristics of different iron oxides reduction by a thermophilic dissimilatory iron reducing bacterium Caloranaerobacter ferrireducens DY22619^T from deep sea

doi: 10.3969/j.issn.0253-4193.2016.08.009

Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China;State Key Laboratory Breeding Base of Marine Genetic Resources, Xiamen 361005, China;Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen 361005, China;South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center, Xiamen 361005, China

Received Date: 2015-11-10
Rev Recd Date: 2016-02-29

Abstract

Abstract

Dissimilatory iron reduction microbes play an important role in iron geochemical cycle. Deep-sea hydrothermal activity is an important source of the oceanic iron. At present there are little research about iron metabolism microbes in deep-sea hydrothermal areas. In this report, the iron reduction capability of Caloranaerobacter ferrireducens DY22619^T from deep sea was characterized. This article compared the iron reduction rate with three different iron oxides as electron acceptor, and analyzed the mineral morphology, element component and crystal face using Transmission Electron Microscope(TEM). The iron reduction rate was the fastest during from exponential to stationary phase and the rate with Amorphous FeOOH and Amorphous Fe(Ⅲ) Oxide was much higher reaching about 2.82 μmol/h and 2.15 μmol/h. TEM results showed the bacterium reduced all the three kinds of iron oxides and formed magnetite particles. The granule size of the magnetite formed with Goethite was the largest, but less in granule number. In addition, the crystal face derived from reducing Amorphous Fe(Ⅲ) Oxide was different from other two oxides. The results indicated the strain has a high potential in iron reducing Fe(Ⅲ) oxides and mineralization in anaerobic respiration. However, the properties of the magnetite and iron reduction rate is influenced by the character of iron oxides. These research indicated the role of dissimilatory iron reduction bacteria of this genus in iron geochemical cycle and biomineralization in deep sea hydrothermal areas.
- Caloranaerobacter ferrireducens,
- iron reduction,
- magnetite,
- biomineralization

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