Abstract
Summary The influence of gibberellic acid (GA) on stomatal opening and changes in the content of potassium and starch of guard cells of Vicia faba and Fritillaria imperialis was studied. GA treatment induced a transient opening of stomata in the dark with a maximum at 5 to 7 h after the beginning of treatment. Although stomata opened nearly to the same extent as in light no substantial accumulation of potassium could be detected by the cobalt nitrite method. Quantitative determination of the starch content of epidermal peels revealed a transient decrease of about 50% after 5 h. Since speed and extent of stomatal opening depends on the initial osmotic potential of guard cells, it is proposed that stomatal movement is influend to a certain degree by the hormonal status of plant tissues.
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