Low affinity H(+)/Pi chloroplastic cotransporter. Involved in inorganic phosphate (orthophosphate, Pi) uptake in green parts of plants in Pi-sufficient conditions. Required for Pi retranslocation during Pi deprivation. Highly specific for Pi among other anions. Optimum pH is 4. Mostly expressed in young green tissues. Present in both auto- and heterotrophic tissues. Also expressed in root stele. During flower development, expressed in sepals, stamens and siliques. In seeds, confined to the connecting site of the funiculus. In seedlings, expressed in cotyledons and hypocotyls. Restricted progressively to vascular tissues as plants become older. Induction by light is inhibited by abscisic acid (ABA) and cycloheximide. May be due to an intron retention. Belongs to the inorganic phosphate transporter (PiT) (TC 2.A.20.2) family.