Photosynthetic competence of the marine aerobic anoxygenic phototrophic bacterium Roseobacter sp. under organic substrate limitation.
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.
Graduate School of Environmental Science, Hokkaido University.
Yuki
Y
Sato-Takabe
Koji
K
Hamasaki
Koji
K
Suzuki
D000332:Aerobiosis; D008027:Light; D008969:Molecular Sequence Data; D009930:Organic Chemicals / Q000032:analysis / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism; D010788:Photosynthesis; D052817:Phototrophic Processes; D010802:Phylogeny; D041904:Roseobacter / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism* / Q000528:radiation effects; D012623:Seawater / Q000382:microbiology*
D009930:Organic Chemicals; D010100:Oxygen