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occurrence and microscopic analyses of multicellular magnetotactic prokaryotes from coastal sediments in the Yellow Sea

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【作者】 周克潘红苗张圣妲岳海东肖天吴龙飞

【Author】 ZHOU Ke1,2,3,PAN Hongmiao2,ZHANG Shengda4,YUE Haidong2,XIAO Tian2,5,,WU Longfei4,5,6,** 1Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences,Yantai 264003,China 2Key Laboratory of Marine Ecology and Environmental Sciences,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China 3Graduate University of Chinese Academy of Sciences,Beijing 100049,China 4College of Marine Life Science,Ocean University of China,Qingdao 266003,China 5France-China Bio-Mineralization and Nano-Structures Laboratory,Beijing 100029,China 6Laboratoire de Chimie Bacterienne,Université de la Méditerranée Aix-Marseille II,CNRS,Marseille,France

【机构】 Yantai Institute of Coastal Zone Research,Chinese Academy of SciencesKey Laboratory of Marine Ecology and Environmental Sciences,Institute of Oceanology,Chinese Academy of SciencesGraduate University of Chinese Academy of SciencesCollege of Marine Life Science,Ocean University of ChinaFrance-China Bio-Mineralization and Nano-Structures LaboratoryLaboratoire de Chimie Bacterienne,Université de la Méditerranée Aix-Marseille II,CNRS,Marseille,France

【摘要】 Multicellular magnetotactic prokaryotes(MMPs) are a group of aggregates composed of 7-45 gram-negative cells synthesizing intracellular magnetic crystals.Although they are thought to be globally distributed,MMPs have been observed only in marine environments in America and Europe.Most MMPs share a rosette-like morphology and biomineralize iron sulfide crystals.In the present study,abundant MMPs were observed,with a density of 26 ind./cm3,in the sediments of a coastal lagoon,Lake Yuehu,in the Yellow Sea.Optical microscopy showed that all of them were rosette shaped with a diameter of 5.5±0.8 mm.Transmission electron microscopy revealed that these MMPs were composed of 10-16 ovoid cells and flagellated peritrichously.High-resolution transmission electron microscopy and energy dispersive X-ray analysis indicated that they biomineralized bullet-shaped magnetite crystals in highly organized parallel chains within which the magnetosomes were oriented in the same direction.This is the first report of MMPs from Asia and demonstrates the ubiquitous distribution of MMPs.

【Abstract】 Multicellular magnetotactic prokaryotes(MMPs) are a group of aggregates composed of 7-45 gram-negative cells synthesizing intracellular magnetic crystals.Although they are thought to be globally distributed,MMPs have been observed only in marine environments in America and Europe.Most MMPs share a rosette-like morphology and biomineralize iron sulfide crystals.In the present study,abundant MMPs were observed,with a density of 26 ind./cm3,in the sediments of a coastal lagoon,Lake Yuehu,in the Yellow Sea.Optical microscopy showed that all of them were rosette shaped with a diameter of 5.5±0.8 mm.Transmission electron microscopy revealed that these MMPs were composed of 10-16 ovoid cells and flagellated peritrichously.High-resolution transmission electron microscopy and energy dispersive X-ray analysis indicated that they biomineralized bullet-shaped magnetite crystals in highly organized parallel chains within which the magnetosomes were oriented in the same direction.This is the first report of MMPs from Asia and demonstrates the ubiquitous distribution of MMPs.

【基金】 Supported by the National Natural Science Foundation of China(Nos. 40906069,40776094);Shangdong 908 Project (No. SD-908-02-08);the Haiwaijiechuxuezhe-Fund of Chinese Academy of Sciences (No.2006-1-15);K. C. WONG Education Foundation
  • 【文献出处】 Chinese Journal of Oceanology and Limnology ,中国海洋湖沼学报(英文版) , 编辑部邮箱 ,2011年02期
  • 【分类号】Q178
  • 【被引频次】11
  • 【下载频次】51
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