Water channel required to facilitate the transport of water across cell membrane. May be involved in the osmoregulation in plants under high osmotic stress such as under a high salt condition. Interacts with SYP61 and SYP121 in trafficking vesicles and at the plasma membrane. Trafficking from the post-Golgi compartment to the plasma membrane is mediated by the SNARE proteins SYP61 and SYP121. Highly expressed in flowers, expressed at low levels in siliques, and at low level in leaves and roots (PubMed:10102577, PubMed:11806824). Highly levels in elongating cells in both roots and shoots (PubMed:25082856). By NaCl and abscisic acid (ABA) treatments. Aquaporins contain two tandem repeats each containing three membrane-spanning domains and a pore-forming loop with the signature motif Asn-Pro-Ala (NPA). Belongs to the MIP/aquaporin (TC 1.A.8) family. PIP (TC 1.A.8.11) subfamily.