Various spp. including and secrete indole-3-acetic acid (IAA) when fed with -tryptophan (Trp). Production of IAA was detected in strains causing potato scab as well as in non-pathogenic strains. The pathways for IAA synthesis from Trp were investigated in and Indole-3-acetamide (IAM), indole-3-lactic acid (ILA), indole-3-ethanol (IEt) and IAA were identified by HPLC and GC-MS. cells were capable of catabolizing IAM, ILA, IEt and indole-3-acetaldehyde (IAAId) into IAA. Incorporation of radioactivity into IAM, IAA and IAL but not IEt was detected when cells were fed with -[3-C]tryptophan. Results indicate the presence of the IAM pathway (Trp → IAM → IAA) and the possible presence of additional pathways for IAA biosynthesis in


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