Involved in thiol transport from the plastid to the cytosol. Transports probably both glutathione (GSH) and its precursor, gamma-glutamylcysteine (gamma-EC). No visible phenotype. Clt1, clt3 and clt3 triple mutants are more sensitive to Cd(2+), have a decreased level of cytosolic GSH, an altered systemic acquired resistance response and are more sensitive to Phytophthora infection (PubMed:20080670). Clt1, clt3 and clt3 triple mutants have decreased lateral root densities (PubMed:24204368). Belongs to the CRT-like transporter family.