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Plant and Cell Physiology, 1986, Vol. 27, No. 1 155-162
© 1986

Article

Rhythmic and Blue Light-Induced Turgor Movements and Electrical Potential in the Laminar Pulvinus of Phaseolus vulgaris L.

Yuichiro Nishizaki

Faculty of General Education, Kobe Gakuin University Nishi-ku, Kobe 673, Japan

The well-known circadian movement in Phaseolus leaves is usually superimposed with small and somewhat irregular rhythmic changes of pulvinar movement. This study examines the relationship between these small pulvinar movements and the membrane potential of the motor cell as well as the effect of light on them. Blue light affected both the movements and potential while red and green lights of the same photon flux had little effect. Also, the difference in the membrane potential between the extensor and flexor cells was found to be closely related to the rhythmic turgor movement of the pulvinus. Changes in the potential difference always preceded the movement. Sequential changes of the potential difference and turgor pressure in the motor cells, including the light-induced ones, are discussed in relation to the leaf movement.

(Received August 8, 1985; Accepted November 11, 1985)
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Y. Okazaki
Blue Light Inactivates Plasma Membrane H+-ATPase in Pulvinar Motor Cells of Phaseolus vulgaris L.
Plant Cell Physiol., August 15, 2002; 43(8): 860 - 868.
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