Metabolism of indole-3-acetic acid in rice: Identification and characterization of N-β-d-glucopyranosyl indole-3-acetic acid and its conjugates

N-β-d-Glucopyranosyl indole-3-acetic acid (IAA-N-Glc) and its aspartate and glutamate amides were identified in rice plants by LC-ESI-MS/MS and chemical synthesis. This is the first report to demonstrate that endogenous IAA undergoes N-glucosylation in herbaceous plants.