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

作　　者：周克 潘红苗 张圣妲 岳海东 肖天 吴龙飞 

机构地区：[1]Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences [2]Key Laboratory of Marine Ecology and Environmental Sciences,Institute of Oceanology,Chinese Academy of Sciences [3]Graduate University of Chinese Academy of Sciences [4]College of Marine Life Science,Ocean University of China [5]France-China Bio-Mineralization and Nano-Structures Laboratory [6]Laboratoire de Chimie Bacterienne,Université de la Méditerranée Aix-Marseille II,CNRS,Marseille,France

出　　处：《Chinese Journal of Oceanology and Limnology》2011年第2期246-251,共6页中国海洋湖沼学报（英文版）

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

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./cm^3, 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 μm. 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.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.

关 键 词：multicellular magnetotactic prokaryotes rosette-like MAGNETOSOMES MAGNETITE Yellow Sea 

分 类 号：Q178[生物学—水生生物学]