【摘 要】
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The years purple bacteria,a major group of anoxygenic phototrophic bacteria which preceded oxygenic photosynthesis on earth by billions of years and widely distributed in nature,primarily in aquatic h
【机 构】
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Department of Bioengineering and Biotechnology, Huaqiao University, Xiamen 361021, China
【出 处】
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第八届全国微生物资源学术暨国家微生物资源平台运行服务研讨会
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The years purple bacteria,a major group of anoxygenic phototrophic bacteria which preceded oxygenic photosynthesis on earth by billions of years and widely distributed in nature,primarily in aquatic habitats,have become increasingly important as research tool for the study of basic problem in photosynthesis,nitrogen metabolism,sulfur metabolism and Fe cycle and have contributed in major ways to our understanding of the role of photosynthesis systems,the biogeochemistry of C,N,S,Fe in the earth evolution.Purple sulfur bacteria (1) are strong photoautotrophs with CO2 as sole carbon source and participate in the anoxic cycling of carbon both as primary producers (CO2 fixation,photoautotrophy),also as light-stimulated consumers of reduced organic compounds (photoheterotrophy).In certain habitats particularly favorable for their development,purple bacteria have been shown to be significant primary producers.(2) Consume a toxic substance (H2S,ammonium etc.) and contribute organic matter to anoxic environments by their autotrophic capacities.In most illuminated sulfidic habitats the role of purple bacteria as H2S consumers is probably more important than any contribution they make to primary production;H2S is a highly poisonous substance for plants and animals and also for many bacteria.The oxidation of sulfide by purple bacteria yields nontoxic forms of sulfur,such as elemental sulfur (S0) and sulfate (SO4 2-).Sulfide oxidation thus allows the upper waters of a lake to remain oxic and suitable for plants,animals,and aerobic bacteria.(3) consume organic compounds;(4) share many basic properties with their nonphototrophic relatives,and (5) offer scientists in the photosynthesis community of molecular diversity and evolution for the study of photosynthesis.
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