Light-mediated Changes in Pigmentation of Pseudomonas aeruginosa Cultures

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Abstract
Cultures of P. aeruginosa PAO grown under uninterrupted broad-spectrum light showed different pigmentation from dark-grown cultures. Whereas dark-grown bacteria produced pigments which resulted in blue-purple colored agar, light-grown organisms produced red colored plates. Extraction and quantification of pigments showed that both dark- and light-grown cultures produced similar concentrations of pyorubrin (red) and pyoverdin (yellow). The concentration of pyocyanin (blue) was substantially reduced under certain lighting conditions. This decrease was dependent on light intensity and wavelength and occurred with light in the UV and violet region of the spectrum. After its release from bacteria, pyocyanin was rapidly and nonreversibly photoinactivated with 1st-order kinetics to produce colorless photoproduct(s).

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