May act as an efflux-type nitrite transporter. Not regulated by the PII protein involved in the regulation of nitrite uptake into higher plant chloroplasts. Expressed in shoots, stems, leaves, flowers and siliques. Slower growth and delayed bolting. Nitrite accumulation in leaves. Belongs to the major facilitator superfamily. Proton-dependent oligopeptide transporter (POT/PTR) (TC 2.A.17) family.