PIN3 — Medicago truncatula

Summary

MtPIN3 (MTR_1G030890) in barrel medic encodes a member of the auxin efflux carrier family, possessing auxin efflux transmembrane transporter activity, inositol-1,4-bisphosphate 1-phosphatase activity, and phosphatidylinositol phosphate binding. It is associated with auxin export across the plasma membrane, basipetal auxin transport, tropism, regulation of shade avoidance, and detection of oxidative stress. The gene is linked to numerous developmental and agronomic traits, including root length, lateral root length, root hair length, seedling hypocotyl length, stem elongation, shoot axis branching, leaf morphology, petiole length, flowering time, chlorophyll content, leaf senescence, and responses to gravity, phototropism, osmotic stress, ethylene, brassinosteroids, low temperature, and manganese. It localizes to the lateral and basal plasma membrane, auxin efflux carrier complex, and vesicle membrane. Studies of related genes in other species connect the family to root meristem formation, embryo patterning, polar auxin transport, and lateral root gravitropism.