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Science 17 May 1968:
Vol. 160. no. 3829, pp. 784 - 785
DOI: 10.1126/science.160.3829.784
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Articles

Stomatal Opening: Role of Potassium Uptake by Guard Cells

R. A. Fischer 1

1 Laboratory of Plant-Water Relations, Department of Water Science and Engineering, University of California, Davis

Stomata in isolated epidermal strips open in response to light plus air free of carbon dioxide when the strips are floated on potassium chloride solutions of low concentrations. This opening depends on the stimulation of active accumulation of potassium in quantities sufficient to account for the observed changes in solute potential of the guard cells.


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