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Articles

Effects of Salicylic and Acetylsalicylic Acids on the Scotonastic and Photonastic Leaflet Movements of Cassia fasciculata¹

University of Poitiers, Station Biologique de Beau Site, 25 Faubourg Saint Cyprien, 86000 Poitiers, France

Salicylic and acetylsalicylic acids applied on excised leaves of Cassia fasciculata modify the dark-induced (scotonastic) and light-induced (photonastic) leaflet movements. They inhibit the scotonastic movements in a dose-dependent manner from 1 x 10^–4 to 1 x 10^–3 molar and they promote the photonastic movements at an optimum concentration of 5 x 10^–4 molar. These results suggest that these phenolic compounds do not act specifically on the K⁺ uptake, which was shown to be inhibited by their action on other materials.

¹ Supported by the Centre National de la Recherche Scientifique (ERA 701 and RCP 474).