Peptide transporter. Mediates the transport of di- and tripeptides. High affinity transporter. Involved in the uptake of peptides during pollen germination and tube growth. Expressed in developing and germinating pollen grains and ovules. Expressed during early seed development. No visible phenotype. Belongs to the major facilitator superfamily. Proton-dependent oligopeptide transporter (POT/PTR) (TC 2.A.17) family.