Correlation of the production of photosynthetic pigments with the type and amount of carbon source in batch cultures. Cultures were incubated under dim light with 12% (v/v) O2 in the headspace gas atmosphere. The amount of produced BChl a is symbolized by red bars for L. syltensis DSM 22749T, blue bars for C. halotolerans DSM 23344T and green bars for P. rubra DSM 19751T. A. The effect of substrate reduction on pigment production is demonstrated by cultivation in defined media containing 10 mM of the respective carbon source. B. The dependence of pigment production on substrate concentration is shown by cultivation of L. syltensis DSM 22749T in defined medium with 12% (v/v) O2 in the headspace gas atmosphere containing 2.5 mM pyruvate (1), 5.0 mM pyruvate (2) and 10.0 mM pyruvate (3) as carbon source. C. halotolerans DSM 23344T and P. rubra DSM 19751T were grown in defined medium containing 2.5 mM DL-malate (1), 5.0 mM DL-malate (2) and 10.0 mM DL-malate (3) as carbon source.