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Plant and Cell Physiology, 1981, Vol. 22, No. 5 911-916
© 1981

Article

Latent Periods of Cytokinin-induced Stomatal Opening in the Sunflower Leaf

Susumu Kuraishi1, Yasushi Hashimoto2 and Masaya Shiraishi2

1Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University Hiroshima 730, Japan
2Department of Agriculture, Ehime University Matsuyama 790, Japan

Spraying a zeatin solution on the mature leaf of an intact sunflower plant (Helianthus annuus L. cv. Large Russian) caused a two-fold decrease in leaf temperature during the 20 min after treatment. Scanning electron microscope photographs taken 2 min after cytokinin treatment, however, showed a small but distinct stimulation of the opening of the central pore of the stomata, indicating that the latent period of cytokinin-induced stomatal opening is only 2 min. Five minutes after treatment with zeatin, the stomata at both the central pore and the outer ledge had opened widely. On the other hand, zeatin riboside treatment did not show a distinct effect on the stomatal opening within these periods. The stomata of a water-sprayed leaf closed within 1 min after the treatment.

(Received January 7, 1981; Accepted June 12, 1981)
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