Mediates zinc accumulation in roots and confers resistance to zinc. Involved in sequestration of excess zinc in the cytoplasm into vacuoles to maintain zinc homeostasis. Can also transport cadmium with a low efficiency. Tonoplast. Ubiquitously expressed at low levels. By treatment with high concentrations of zinc. No visible phenotype under normal growth condition, but hypersensitivity to elevated levels of zinc. Belongs to the cation diffusion facilitator (CDF) transporter (TC 2.A.4) family. SLC30A subfamily.