Aerobic anoxygenic phototrophic bacteria and their roles in marine ecosystems

作     者：JIAO Nianzhi Michael E. Sieracki ZHANG Yao DU Hailian 

作者机构：Key Lab for Marine Environmental Sciences of Ministry of Education Center for Marine Environmental Sciences Xiamen UniversityBigelow Laboratory for Ocean SciencesKey Lab for Marine Environmental Sciences of Ministry of Education Center for Marine Environmental Sciences Xiamen UniversityKey Lab for Marine Environmental Sciences of Ministry of Education Center for Marine Environmental Sciences Xiamen University Xiamen 361005 ChinaME 04575 USAXiamen 361005 ChinaXiamen 361005 China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：2003年第48卷第11期

页      面：1064-1068页

核心收录：

学科分类：07[理学] 0713[理学-生态学] 

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.40232021,40176039 and 30170189) the National Key Basic Research and Development Program(Grant Nos.2001CB409700 and G2000078500) 

主　　题：光合作用 海洋生态系统 AAPB 需氧光养细菌 细菌叶绿素 母细胞 子细胞 色素 类胡萝卜素 光养菌分类 

摘      要：Aerobic anoxygenic phototrophic bacteria (AAPB) are characterized by the following physiological and ecological features. A mother AAPB cell can unusually divide into 3 daughter cells and looks like a 揧?during the division. AAPB cells sometimes adhere together forming a free-floating population. Most of the known AAPB species are obligately aerobic. Bacteriochlorophyll a (BChl a) is the only photosynthetic pigment in AAPB, and the number of BChl a molecules in an AAPB cell is much less than that in an anaerobic phototrophic bacterial cell, while the accessorial pigments carotenoids in AAPB are abundant in concentration and diverse in species. In addition to the common magnesium containing BChl a, a zinc-containing BChla was also seen in AAPB. AAPB have light harvesting complexⅠbut usually lack light harvesting complexⅡ. Although AAPB featur in photosynthesis, their growth is not necessarily light- dependent. There is a mechanism controlling the photosynthesis approach. AAPB are widely distributed in marine environments especially in oligotrophic oceans accounting for a substantial portion of the total biomass and playing a unique role in the cycle of carbon and other biogenic elements. Besides the contribution to primary production, AAPB also have great potentials in bioremediation of polluted environments. Studies on AAPB would be of great value in understanding the evolution of photosynthesis and the structure and function of marine ecosystems.