Involved in the regulation of root growth. Involved in the suppression of the root bending in response to touch stimuli, gravity and light. Regulates negatively stimulus-induced root bending through inhibition of root tip rotation. Expressed in roots, rosette leaves, stems and flowers. No visible phenotype under normal growth conditions, but mutant seedlings exhibit enhanced root wavy growth and curvature in response to gravitropism and phototropism. Belongs to the serine esterase family.