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Plant and Cell Physiology, 1978, Vol. 19, No. 2 253-262
© 1978

Article

Distribution of electric potential and ion transport in the hypocotyl of Vigna sesquipedalis III. Significance of the radial potential difference

Kazuo Ichino

Laboratory of Biology, Department of General Education, Aichi University Toyohashi 440, Japan

The distribution pattern of the trans-root surface potential along the germ axis of Vigna sesquipedalis intimately depended on the existence of oxygen as well as the potential difference (PD) between both cut ends of a cylindrical segment of the hypocotyl. In the grown-up region (basal region) of the hypocotyl, a large change of the trans-root surface potential occurred with anoxia, but not in the elongating zone except in the transient phase after reaeration.

The distribution pattern of the trans-root stump potential along the germ axis, measured just after die hypocotyl had been cut at various positions, was nearly flat. However, PD between die cut stump and a point on the hypocotyl surface at sufficient distance from the stump had a large value.

The results are not explainable based on the axial electromotive forces alone. Consideration of equivalent circuits of the hypocotyl has led to die idea that radial electromotive forces largely contribute to generation of die distribution pattern of the surface electric potential.

(Received June 30, 1977; )
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