Voltage-gated chloride channel that could play a role in the regulation of nitrate content. Homodimer (By similarity). Interacts with PP2A5 (PubMed:27676158). A number of isoforms are produced. According to EST sequences. Broadly expressed in the plant. In shoots and roots by nitrate treatment. Loss-of-function mutation clca-1 leads to an altered nitrate content and hypersensitivity to chlorate. Belongs to the chloride channel (TC 2.A.49) family.