Three oxidative metabolites of indole-3-acetic acid from Arabidopsis thaliana

Three oxidative metabolites of indole-3-acetic acid (IAA), 6-OH-IAA-Phe, 6-OH-IAA-Val, and OxIAA-Glc, were identified from the seedlings of Arabidopsis by LC-ESI-MS/MS-based analysis and chemical synthesis. Quantitative analysis demonstrated that the formation of OxIAA-Glc is a predominant metabolic pathway of IAA in Arabidopsis.