title: Facultative anoxygenic photosynthesis in the cyanobacterium Oscillatoria limnetica.
abstract: An isolate from H2S-rich layers of the Solar Lake, the cyanobacterium Oscillatoria limnetica, exhibits both oxygenic and anoxygenic photosynthesis. It can use Na2S as an electron donor for CO2 photoassimilation (photosystem I supplies the energy) in the presence of 3-(3,4-dichlorophenyl)-1,1-dimethylurea or 700-nm light. A stoichiometric ratio of approximately 2 is observed between the Na2S consumed and the photoassimilated CO2. The anoxygenic phototrophic capability of this cyanobacterium explains its growth in nature in high sulfide concentrations and indicates a selective advantage.
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D002245:Carbon Dioxide / Q000378:metabolism; D002734:Chlorophyll / Q000378:metabolism; D000458:Cyanobacteria / Q000378:metabolism*; D004237:Diuron / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D007700:Kinetics; D008027:Light; D010775:Photic Stimulation; D010788:Photosynthesis / Q000187:drug effects; D010798:Phycocyanin / Q000378:metabolism; D013440:Sulfides / Q000378:metabolism / Q000494:pharmacology
chemical_list: D013440:Sulfides; D010798:Phycocyanin; D002734:Chlorophyll; D002245:Carbon Dioxide; D004237:Diuron