Low-affinity proton-dependent nitrate transporter. Not involved in dipeptides transport. Expressed in shoots, leaves, flowers and siliques. Expressed in leaf petiole. Up-regulated in the shoots by nitrate, but no changes in the roots. Wider leaves resulting from increased cell expansion. Lower nitrate content of the petiole and midrib. Belongs to the major facilitator superfamily. Proton-dependent oligopeptide transporter (POT/PTR) (TC 2.A.17) family.