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Plant and Cell Physiology, 1990, Vol. 31, No. 2 187-193
© 1990

Article

Effect of EGTA on Nyctinastic Closure Mediated by Phytochrome in Albizzia lophantha

Luisa Moysset and Esther Simón

Plant Biology Department, Plant Physiology Unit, Faculty of Biology, University of Barcelona Avda. Diagonal 645, 08028 Barcelona, Spain

The role of extracellular calcium on nyctinastic closure of Albizzia lophantha leaflets has been studied by testing the effect of ethyleneglycol-bis-(ß-aminoethylether)-N,N,N',N'-tetraacetic acid (EGTA) and its reversibility by calcium. EGTA (1 and 5 mM) causes an inhibition of nyctinastic closure and at a concentration of 1 mM EGTA it decreases the difference between the effect of red light (R) and far-red light (FR) irradiation on leaflet closure. A simultaneous or subsequent supply of CaCl2 (5 or 10 mM) reverses EGTA (5 mM) inhibition on closure as well as causing an additional promotion of closure.

We suggest that external calcium could play a dual role in nyctinastic closure. Phytochrome control of leaflet closure probably needs external Ca2+ and, in addition, Ca2+ could regulate the closure mechanism by controlling ionic fluxes through the plasma membrane in pulvinular motor cells.

(Received June 9, 1989; Accepted November 27, 1989)
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