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Plant Physiology 85:318-321 (1987)
© 1987 American Society of Plant Biologists

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Environmental and Stress Physiology

Promotion of Stomatal Opening by Indoleacetic Acid and Ethrel in Epidermal Strips of Vicia faba L

Linda K. Levitt, Diana B. Stein and Bernard Rubinstein

Department of Biological Science, Mount Holyoke College, South Hadley, Massachusetts 01075, Department of Botany, University of Massachusetts, Amherst, Massachusetts 01003

Indole-3-acetic acid (IAA), at concentrations of 0.01 to 1.0 millimolar, and ethephon (0.3% v/v Ethrel) promote stomatal opening when applied to epidermal peels of Vicia faba L. in light or dark. The effect of ethylene is seen by 30 minutes and maximal opening (over two times that of untreated controls) occurs after only 60 to 90 minutes in the light. Stomatal opening by IAA and Ethrel in both light and dark is prevented by 0.14 millimolar AgCl. It is suggested that the effect of added IAA, but not that of light, is linked to ethylene production. The possible role of ethylene in stomatal opening during fungal infection is discussed. The stomates of Vicia faba provide a new system to study the effects of ethylene on certain membrane-regulated processes.




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Copyright © 1987 by the American Society of Plant Biologists