胡艺豪^1,2,3, 姜明玉^1,2, 曹文瑞^1,2, 萨仁高娃^1,2, 于心科^1,2, 常凤鸣^1,2
1.中国科学院海洋研究所, 海洋地质与环境重点实验室, 山东 青岛 266071;2.中国科学院海洋大科学研究中心, 山东 青岛 266071;3.中国科学院大学, 北京 100049

摘要:
为了解海洋微生物的生物矿化作用在大洋铁锰结核形成过程中的意义，选取芽孢八叠球菌作为实验菌株，通过实验室模拟中性有氧环境下的生物矿化实验，测定了Fe生物矿化过程中Fe离子浓度与价态的变化、细菌表面形态与矿物成分的变化。反应过程中，通过与死菌对照组和空白对照组的对比研究，有菌实验组的总Fe浓度、Fe²⁺浓度和Fe³⁺浓度下降最快，尤其是在前24 h。TEM照片显示细菌表面有明显的矿物颗粒生成，对这些矿物颗粒进行EDS分析测定，推测为Fe的氧化物或氢氧化物。实验结果表明，以芽孢八叠球菌为代表的海洋微生物在中性有氧条件下，通过主被动相结合的过程，对Fe产生了明显的矿化作用，揭示了微生物矿化作用对大洋铁锰结核形成的贡献。
关键词:地质微生物铁锰结核生物矿化磺基水杨酸(SSA)分光光度法
DOI：10.11759/hykx20210126002
分类号:P74
基金项目:国家自然科学基金面上项目（41976202）；山东省自然科学基金面上项目（ZR2020MD088）；自然资源部海洋沉积与环境地质重点实验室开放基金（MASEG201901）

Biomineralization of Fe by the marine microorganism Paenisporosarcina quisquiliarum
HU Yi-hao^1,2,3, JIANG Ming-yu^1,2, CAO Wen-rui^1,2, SAREN Gao-wa^1,2, YU Xin-ke^1,2, CHANG Feng-ming^1,2
1.CAS Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;3.University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:
This study aims to investigate the role of the biomineralization of marine microorganisms in the formation of oceanic ferromanganese (Fe-Mn) nodules. We have selected Paenisporosarcina quisquiliarum for this biomineralization simulation experiment in neutral aerobic environmental conditions. We have also measured the changes in Fe ion concentration and speciation, as well as the changes in bacterial surface morphology and mineral composition during the mineralization process. Compared with the concentrations in the dead bacteria control group and the blank control group, the total concentrations of Fe and Fe²⁺/Fe³⁺ in the experimental group with bacteria decreased the fastest, especially in the first 24 h of the reaction process. As revealed in the TEM and EDS analyses, mineral particles of Fe oxides or hydroxides are formed on the surface of the bacterial cells. This implies that under neutral aerobic conditions, active and passive interaction processes can cause Fe mineralization of marine microorganisms such as P. quisquiliarum. This study reveals the contribution of microbial mineralization processes to the formation of oceanic ferromanganese nodules.
Key words:geomicrobiologyferromanganese nodulesbiomineralization5-sulfosalicylic acid (SSA) spectrophotometry





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