Promotion of stomatal opening in detached epidermis of Kalanchoe daigremontiana Hamet et Perr. by natural and synthetic cytokinins.

The cytokinins kinetin and zeatin increased stomatal opening at 15°C in the dark by up to 50% in detached epidermis of the CAM plant Kalanchoe daigremontiana. Stomata opened maximally following incubation with 10 mmol m(-3) cytokinin. This study extends the range of species in which exogenous cytokinins promote stomatal opening.