Guard cell responses to potassium ferricyanide |
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Authors: | Alain Vavasseur Gérard Lascève Alain Cousson |
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Institution: | CEA, Départ, de Physiologie Végétale et Ecosystèmes, Centre ďEtudes Nucléaires de Cadarache, F-13108 Saint-Paul-lez-Durance Cedex, France. |
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Abstract: | Micromolar concentrations of potassium ferricyanide inhibit light-induced stomatal opening. The extent of the inhibition is dependent on the presence of carbon dioxide and the concentration of potassium ferricyanide needed to obtain 50% inhibition of stomatal opening is 40-fold higher in CO2-free air than in normal air. The fungal toxin, fusicoccin (1 μ M ), overcame the ferricyanide inhibition of stomatal opening indicating that the electron acceptor may interact more or less directly with the activity of the plasma membrane H+-ATPase. Although potassium ferricyanide strongly inhibited stomatal opening, it had only minor effects on stomatal maintaining or stomatal closure due to darkness or ABA. |
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Keywords: | Commelina communis fusicoccin guard cells guard cell protoplasts plasma membrane potassium ferricyanide redox system |
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