Aerobic Methylobacteria Are Capable of Synthesizing Auxins |
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Authors: | E G Ivanova N V Doronina Yu A Trotsenko |
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Institution: | (1) Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, pr. Nauki 5, Pushchino, Moscow oblast, 142290, Russia |
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Abstract: | Obligately and facultatively methylotrophic bacteria with different pathways of C1 metabolism were found to be able to produce auxins, particularly indole-3-acetic acid (IAA), in amounts of 3–100 g/ml. Indole-3-pyruvic acid and indole-3-acetamide were detected only in methylobacteria with the serine pathway of C1 metabolism (Methylobacterium mesophilicumand Aminobacter aminovorans).The production of auxins by methylobacteria was stimulated by the addition of L-tryptophan to the growth medium and was inhibited by ammonium ions. The methylobacteria under study lacked tryptophan decarboxylase and tryptophan side-chain oxidase. At the same time, they were found to contain several aminotransferases. IAA is presumably synthesized by methylobacteria through indole-3-pyruvic acid. |
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Keywords: | aerobic methylotrophic bacteria Methylobacterium Aminobacter Methylovorus Paracoccus auxins indole-3-acetic acid |
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