11. Typically, cytokinins are transported in the xylem. 12. Cytokinin moves from the roots into the shoots, eventually signaling lateral bud growth.13. Also in context of biological control of plant diseases cytokinins seem to have potential functions. 14. Nevertheless, there have been subsequent discoveries of other more potent phenylurea-type cytokinins . 15. Cytokinins are involved in many plant processes, including cell division and shoot and root morphogenesis.16. The " direct inhibition hypothesis " posits that these effects result from the cytokinin to auxin ratio. 17. This pathway is initiated by cytokinin binding to a histidine kinase receptor in the endoplasmic reticulum membrane. 18. ACC synthesis increases with high levels of auxins, especially indole acetic acid ( IAA ) and cytokinins . 19. The plant hormones called cytokinins initiate root nodule formation, in a process closely related to mycorrhizal association. 20. The cytokinin effect of DPU is considered low as compared to that of adenine derivatives such as zeatin.
