*2.3.3 Cytokinin transport*

In the xylem and phloem, cytokinins are moved from roots to shoots and the other way around. By conveying information about nutrient availability, for instance, transported cytokinins may play a part in coordinating root and shoot growth. To enable

effective mobilisation and tailored translocation of cytokinins, many cellular importers and exporters are necessary, although little is understood about cytokinin transporters. According to transport studies, cytokinins are transported through a widespread H + -coupled high-affinity purine transport pathway [18].
