Photosynthetic Competence of the Marine Aerobic Anoxygenic Phototrophic Bacterium Roseobacter sp. under Organic Substrate Limitation

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  • Sato-Takabe Yuki
    Graduate School of Environmental Science, Hokkaido University Center for Marine Environmental Studies, Ehime University
  • Hamasaki Koji
    Atmosphere and Ocean Research Institute, the University of Tokyo
  • Suzuki Koji
    Graduate School of Environmental Science, Hokkaido University Faculty of Environmental Earth Science, Hokkaido University

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  • Photosynthetic Competence of the Marine Aerobic Anoxygenic Phototrophic Bacterium <i>Roseobacter</i> sp. under Organic Substrate Limitation

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This paper describes the photosynthetic response of a Roseobacter strain of marine aerobic anoxygenic phototrophic bacteria to an organic substrate limitation. In batch cultures, higher values of the spheroidenone/bacteriochlorophyll a ratio were observed under substrate-deficient conditions. Interestingly, the maximum photochemical quantum efficiencies of the photosystem under substrate-deficient conditions using blue or green excitation were significantly higher than those under substrate-replete conditions. These results indicate that spheroidenone, which can absorb green light, may play an important role in their photosynthesis as a light-harvesting antenna pigment, and the photosynthetic competence of the Roseobacter strain can increase in an organic substrate-deficient environment.

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