STUDIES OF PIGMENTATION BY PSEUDOMONAS INDIGOFERA

Abstract
A pseudomonad which deposited a large quantity of a blue extracellular pigment on the top of the colony was isolated from soil and pond water. It was found to be identical both physiologically and morphologically with Pseudomonas indigofera. Good pigmentation was obtained in a synthetic medium containing methionine, glutamine, arginine, and aspartic acid. The addition of other amino acids reduced growth and/or pigmentation. Chemical properties as well as spectral data strongly suggest that the pigment is indigoidine.

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