Broadening the roles of UDP‐glycosyltransferases in auxin homeostasis and plant development

The levels of the important plant growth regulator indole-3-acetic acid (IAA) are tightly controlled within tissues to spatiotemporally orchestrate concentration gradients that drive and development. Metabolic inactivation bioactive IAA is known participate in modulation maxima minima. can be irreversibly inactivated by oxidation conjugation aspartate glutamate. Usually overlooked because its reversible nature, most abundant inactive form IAA-glucose (IAA-glc) conjugate. Glycosylation Arabidopsis thaliana reported carried out UDP-glycosyltransferase 84B1 (UGT84B1), while UGT74D1 has been implicated glycosylation formed catabolite oxIAA. Here we demonstrated both UGT84B1 modulate throughout development dual oxIAA glycosylation. Moreover, identified a novel UGT subfamily whose members redundantly mediate skotomorphogenic growth.