Glucosyltransferase that acts on the auxin indole-3-butyric acid (IBA). Mediates abiotic stress responses and stress-induced morphological adaptations by regulating auxin homeostasis. Possesses low activity in vitro on jasmonate (JA) and the synthetic auxin analog naphthaleneacetic acid (NAA). (indol-3-yl)butanoate + UDP-alpha-D-glucose = 4-(indol-3-yl)butanoyl-beta-D-glucose + UDP Expressed in roots, cotyledons and leaf hydathodes. By H(2)O(2) and abiotic stresses. No visible phenotype under normal growth condition. Plants overexpressing UGT74E2 develop more compact rosette structure with shorter petioles, dark-green leaves and a shoot branching phenotype after inflorescence emergence. Mature plants are shorter than wild-type. Over-expression of UGT74E2 increases plant tolerance to osmotic stress. Belongs to the UDP-glycosyltransferase family.