Abstract
Indoleacetic acid (IAA) production from tryptophan by Rhizobium leguminosarum biovar trifolii under various conditions was studied. IAA production proceeded without oxygen consumption, it was dependent on the presence of pyridoxal phosphate and 2-oxoglutarate, and it was inhibited by glutamic acid indicating that it is mediated by tryptophan aminotransferase activity. Five aromatic amino acid aminotransferases in this bacterium were detected which can be distinguished by electrophoretic mobility, ion-exchange chromatography and activity on histidine. None of them was active on nonaromatic amino acids other than histidine.
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