PIN1 — Medicago truncatula

Summary

MTR_6G069510, designated MtPIN1, encodes a PIN-like auxin efflux carrier protein with auxin efflux transmembrane transporter activity, inositol-1,4-bisphosphate 1-phosphatase activity, and phosphatidylinositol phosphate binding. In barrel medic, MtPIN1 is associated with leaflet formation, regulation of shade avoidance, stigma development, anthocyanin accumulation in response to UV light, detection of oxidative stress, and response to boron and cation stress. The gene is linked to traits including gravity response, phototropism, leaf vein morphology, shoot axis branching, lateral root number, root hair length, seed set percent, stamen morphology, petiole length, and seedling hypocotyl length. It localizes to the auxin efflux carrier complex, recycling endosome, clathrin-coated vesicles, and the basal plasma membrane. Studies of related genes in other species link the family to polar auxin transport, leaf vascular patterning, root meristem growth, phototropism, and flower formation.