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Plant and Cell Physiology, 1994, Vol. 35, No. 5 841-844
© 1994

Short communication

Vanadate and Dicyclohexylcarbodiimide Inhibit the Blue Light-Induced Depolarization of the Membrane in Pulvinar Motor Cells of Phaseolus

Yuichiro Nishizaki

Laboratory of Biology, Faculty of Humanities and Sciences, Kobe Gakuin University Nishi-ku, Kobe, 651-21 Japan

Transient depolarization of cell membranes precedes induction by a pulse of blue light (BL) of pulvinar movement in Phaseolus vulgaris. The depolarization may involve the plasma membrane H+-ATPase since vanadate and dicyclohexylcarbodiimide decreased or almost completely inhibited depolarization. BL may inactivate the enzyme, thereby decreasing the turgor pressure in motor cells.

(Received February 15, 1994; Accepted April 21, 1994)
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