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Background  Populations of aerobic anoxygenic photoheterotrophic bacteria in marine environments are dominated by members of the  Roseobacter  lineage within the  Alphaproteobacteria  and the OM60/NOR5 clade of gammaproteobacteria. A wealth of information exists about the regulation of pigment production and mixotrophic growth in various members of the  Roseobacter  clade, but a detailed knowledge about aerobic bacteriochlorophyll  a -containing gammaproteobacteria is still limited to one strain of the species  Congregibacter litoralis .    Results  The production of photosynthetic pigments and light-dependent mixotrophic growth was analysed in  Luminiphilus syltensis  DSM 22749 T ,  Chromatocurvus halotolerans  DSM 23344 T  and  Pseudohaliea rubra  DSM 19751 T , representing three taxonomically diverse strains of bacteriochlorophyll  a -containing gammaproteobacteria affiliated to the OM60/NOR5 clade. In these strains the expression of a photosynthetic apparatus depended mainly on the type of carbon source and availability of oxygen. The effect of illumination on pigment expression varied significantly between strains. In contrast to  Chromatocurvus halotolerans,  pigment production in  Luminiphilus syltensis  and  Pseudohaliea rubra  was repressed by light of moderate intensities, probably indicating a higher sensitivity to light-induced oxidative stress. The efficiency of using light for mixotrophic growth did not correlate with the cellular level of photosynthetic pigments, but depended mainly on the type of metabolized substrate with malate being the optimal carbon source in most cases.    Conclusions  Oligotrophic growth conditions or carbon limitation were not required for light-dependent mixotrophic growth in members of the OM60/NOR5 clade. The ability of using light as energy source and the fine tuning of photosynthesis gene expression depended mainly on the type of carbon source and oxygen availability, which indicates that the regulation of pigment production is controlled by the cellular redox state. While light has the main impact on the regulation of photosynthetic pigments in photoheterotrophic representatives of the  Roseobacter  lineage this was not the case in strains of the OM60/NOR5 clade.

bmc microbiology

Mixotrophic growth of bacteriochlorophyll a-containing members of the OM60/NOR5 clade of marine gammaproteobacteria is carbon-starvation independent and correlates with the type of carbon source and oxygen availability