Mechthild Tegeder is the Herbert L. Eastlick Distinguished Professor in Biological Sciences at Washington State University. Dr. Tegeder is an international leader in plant nitrogen research and has been at the forefront of research on amino acid and ureide transporter function in plants. Major breakthroughs have been achieved by manipulating transporter expression in model and crop plants, and by applying complex biochemical, physiological, genetic, molecular and cell-biological analyses. Dr. Tegeder and co-workers have identified key players in assimilate partitioning in source and sink organs, and resolved that transporter function influences nitrogen, carbon and sulfur acquisition, source-to-sink translocation and seed loading. They found that changes in nitrogen transport strongly affect primary metabolism and lead the physiological adjustments at the whole plant level.