Professor Tyerman is a world leader in the field of plant membrane transport. He has discovered key transporters, including channels for release of nitrogenous solutes into legume roots, central to symbiotic nitrogen fixation, and channels for sodium uptake in plant roots, central to plant responses to salinity. His outstanding work on plant-water relations includes discoveries of roles of aquaporins (water channels) and earlier use of the pressure-probe to understand mechanisms for turgor regulation. These contributions are unique in the successful application of new technologies at cellular and membrane levels to solve problems linked to stress physiology of whole plants.