Glucose 6-phosphate (Glc6P) transporter (PubMed:15722468). Transports also inorganic phosphate, 3-phosphoglycerate, triose phosphates and, to a leser extent, phosphoenolpyruvate (PubMed:15722468). Responsible for the transport of Glc6P into plastids of heterotrophic tissues where it can be used as a carbon source for starch biosynthesis, as substrate for fatty acid biosynthesis or as substrate for NADPH generation via the oxidative pentose phosphate pathway (OPPP) (PubMed:15722468, PubMed:20712627). Required for dynamic acclimation of photosynthesis and partitioning of Glc6P between the chloroplast and the cytosol (PubMed:19939944, PubMed:25474495). May modulate the sensing of sugar status during early seedling development (PubMed:24489010). Expressed in seeds, flowers, stamens, and rosette leaves, with highest levels found in sepals and senescing leaves. Induced when grown in high light conditions (PubMed:19939944, PubMed:31316533). Highly expressed in response to Pseudomonas syringae treatment (PubMed:15722468). No visible phenotype under normal growth conditions (PubMed:15722468). Slight delay in seedling establishement, specifically in the process of cotyledon greening (PubMed:24489010). Belongs to the TPT transporter family. GPT (TC 2.A.7.9) subfamily.