| 深海嗜热异化铁还原菌Caloranaerobacter ferrireducens DY22619T对不同铁氧化物的铁还原特性 |
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| 引用本文： | 李曦,曾湘,张昭,邵宗泽.深海嗜热异化铁还原菌Caloranaerobacter ferrireducens DY22619T对不同铁氧化物的铁还原特性[J].海洋学报,2016,38(8):83-92. |
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| 作者姓名： | 李曦 曾湘 张昭 邵宗泽 |
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| 作者单位： | 国家海洋局第三海洋研究所 国家海洋局海洋生物遗传资源重点实验室, 福建 厦门 361005;厦门市海洋生物遗传资源重点实验室(省部共建重点实培育基地), 福建 厦门 361005;福建省海洋生物遗传资源重点实验室, 福建 厦门 361005;福建省海洋生物资源开发利用协同创新中心, 福建 厦门 361005 |
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| 基金项目： | 重点基础研究发展项目（973项目）（2012CB417304）；国际海域资源调查与开发“十二五”前沿性课题（DY125-22-QY-32）。 |
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| 摘 要： | 异化铁还原微生物在铁元素的地球化学循环中具有重要意义。深海热液活动是大洋铁元素的重要来源，目前深海热液环境中铁代谢相关微生物研究很少。本文对一株分离自深海热液区的嗜热异化铁还原菌新种Caloranaerobacter ferrireducens DY22619T的铁还原特性进行分析，比较了该菌对无定形羟基氧化铁、无定形铁氧化物和针铁矿3种不同铁氧化物的铁还原速率；并利用透射电镜对矿化产物进行矿物形貌、组成元素和晶型的分析。研究发现该菌生长在指数期至稳定期时，铁还原速率最快，其中对无定形羟基氧化铁和无定形铁氧化物的还原速率较高，达2.82 μmol/h和2.15 μmol/h；透射电镜结果表明，该菌可将3种不同胞外铁氧化物均还原矿化形成颗粒状磁铁矿，由针铁矿矿化形成的磁铁矿少但粒径最大，而由无定形铁氧化物形成的磁铁矿晶面不同于另外两种铁氧化物。结果表明，该菌有很强的铁还原和矿化能力，能厌氧呼吸还原三价铁氧化物，但是铁氧化物的性质对该菌胞外铁还原能力和矿化形成的磁铁矿的性质有重要影响。本研究为认识深海热液环境中异化铁还原菌在铁元素的地球化学循环和生物成矿过程提供了参考。
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| 关 键 词： | Caloranaerobacterferrireducens Fe(Ⅲ)还原 磁铁矿 生物成矿 |
| 收稿时间： | 2015/11/10 0:00:00 |
| 修稿时间： | 2016/2/29 0:00:00 |
Characteristics of different iron oxides reduction by a thermophilic dissimilatory iron reducing bacterium Caloranaerobacter ferrireducens DY22619T from deep sea |
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| Li Xi,Zeng Xiang,Zhang Zhao and Shao Zongze.Characteristics of different iron oxides reduction by a thermophilic dissimilatory iron reducing bacterium Caloranaerobacter ferrireducens DY22619T from deep sea[J].Acta Oceanologica Sinica (in Chinese),2016,38(8):83-92. |
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| Authors: | Li Xi Zeng Xiang Zhang Zhao and Shao Zongze |
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| Institution: | 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 |
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| 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 DY22619T 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. |
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| Keywords: | Caloranaerobacter ferrireducens iron reduction magnetite biomineralization |
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