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Plant and Cell Physiology, 2002, Vol. 43, No. 8 860-868
© 2002 Oxford University Press

Blue Light Inactivates Plasma Membrane H+-ATPase in Pulvinar Motor Cells of Phaseolus vulgaris L.

Yoshiji Okazaki1

Department of Biology, Osaka Medical College, Sawaragicho 2-41, Takatsuki, 569-0084 Japan

Unilateral blue light irradiation induces bending of pulvini of Phaseolus vulgaris towards the source of light. The pulvinar bending is caused by a decrease in turgor pressure of motor cells that are irradiated with blue light. Decrease in the turgor pressure is caused by the net efflux of K+ and counter anions, accompanying membrane depolarization. In the present study the effect of blue light on the activity of plasma membrane H+-ATPase was studied in relation to the membrane depolarization. The activity of the plasma membrane H+-ATPase was measured using protoplast suspensions prepared from laminar pulvini from primary leaves. A pulse of blue light under continuous red light irradiation induced both a transient increase in the external pH and transient inhibition of the vanadate-sensitive ATPase. Continuous blue light irradiation under continuous red light irradiation induced both a sustained increase in the external pH and sustained inhibition of the vanadate-sensitive ATPase. These results show that blue light inhibits the activity of the plasma membrane H+-ATPase. Inactivation of the plasma membrane H+-ATPase supports the membrane depolarization induced by the blue light irradiation.

1 E-mail, bio004@art.osaka-med.ac.jp; Fax, +81-726-74-6033.


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