Up-regulated in shoots by cold, heat, salicylic acid and 1-aminocyclopropane-1-carboxylic acid (ACC). Down-regulated in shoots by mannitol, abscisic acid, kinetin, benzylaminopurine, indole-3-acetic acid and gibberellic acid. Up-regulated in roots by clod, salt, jasmonic acid, salicylic acid, ACC and benzylaminopurine. Down-regulated in roots by indole-3-acetic acid and gibberellic acid. Belongs to the ABC transporter superfamily. ABCG family. Eye pigment precursor importer (TC 3.A.1.204) subfamily.