Involved in auxin biosynthesis. H(+) + indole-3-pyruvate + NADPH + O2 = (indol-3-yl)acetate + CO2 + H2O + NADP(+) Plant hormone metabolism; auxin biosynthesis. Expression relatively broad during early stages of embryogenesis and more restricted to discrete groups of cells in mature embryos. Later, expression mainly restricted to the cotyledons and the apical meristem. Up-regulated by drought. Belongs to the FMO family.