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Plant and Cell Physiology, 1987, Vol. 28, No. 6 1109-1115
© 1987

Article

Action of Benzoic Acid and its o-, m- and p-Hydroxy-Derivatives on the Dark- and Light-Induced Leaflet Movements in Cassia fasciculata Michx.

Saed Saeedi and Gabriel Roblin

University of Poitiers, Station Biologique de Beau-Site 25 Faubourg St Cyprien, F 86000 Poitiers, France

Benzoic acid and its o-, m- and p-hydroxy derivatives applied on excised leaves of Cassia fasciculata modified the dark-induced (scotonasty) and light-induced (photonasty) leaflet movements. Benzoic acid inhibited the scotonastic closure in a dose-dependent manner from 10–4M to 10–3M and promoted the photonastic opening at optimum concentration of 5.10–4M. These effects were dependent upon the position of hydroxyl group on the benzoic ring, the o-derivative inducing a stronger effect than the m- and p-derivatives. Experiments showed that treatment with o-hydroxybenzoic acid had not to exceed 30–60 min and that the maximum effect was obtained at pH 5.5.

(Received September 16, 1986; Accepted June 22, 1987)
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