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Stomatal Opening in Isolated Epidermal Strips of Vicia faba. I. Response to Light and to CO₂-free Air ¹

Laboratory of Plant-Water Relations, Department of Water Science and Engineering, University of California, Davis, California 95616

This paper reports a consistent and large opening response to light + CO₂-free air in living stomata of isolated epidermal strips of Vicia faba. The response was compared to that of non-isolated stomata in leaf discs floating on water; stomatal apertures, guard cell solute potentials and starch contents were similar in the 2 situations. To obtain such stomatal behavior, it was necessary to float epidermal strips on dilute KCl solutions. This suggests that solute uptake is necessary for stomatal opening.

The demonstration of normal stomatal behavior in isolated epidermal strips provides a very useful system in which to investigate the mechanism of stomatal opening. It was possible to show independent responses in stomatal aperture to light and to CO₂-free air.

¹ This work was supported in part by grant B-029-CAL from the Office of Water Resources Research, United States Department of the Interior, and by a grant from the Water Resources Center, University of California, to T. C. Hsiao and R. C. Huffaker.

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