Plant aquaporins on the move: reversible phosphorylation, lateral motion and cycling.

•Plant aquaporins are membrane channels with diverse transport selectivities and cellular roles.•ER exit is an important checkpoint for expression of plasma membrane aquaporins (PIPs).•Hetero-tetramerization of PIPs allows an expanding array of functional combinations.•Partitioning of PIPs within plasma membrane microdomains may regulate their function.•PIP phosphorylation is a major mechanism for fine tuning cell water transport upon environmental changes.