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Plant and Cell Physiology, 1985, Vol. 26, No. 2 375-377
© 1985

Short Communication

Changes in Extracellular pH of the Motor Cells of Mimosa pudica L. during Movement

Keiro Kumon and Shozo Suda1

Department of Biological Fundamentals, The Graduate School of Science and Technology, Kobe University Rokkodai, Kobe 657, Japan

By using a pH micro-electrode, the changes in the pH of the extracellular fluid in the motor tissue of the main pulvinus of Mimosa pudica were examined. During the rapid movement induced by dropping ice-cold water on the petiole, the extracellular pH in the lower half shifted from 5.1 to 5.7, and then decreased gradually to the initial pH within the next 30 min. A similar rise in extracellular pH from 5.1 to 5.4 was also observed in the upper half.

1 Present address: Department of Biology, Kobe Women's University, Higashisuma, Kobe 654, Japan.

(Received May 18, 1984; Accepted December 6, 1984)
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