Aquaporins facilitate the transport of water and small neutral solutes across cell membranes. Predominantly expressed in green siliques. Also expressed above ground, in roots and flower buds. 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.