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Plant and Cell Physiology, 1985, Vol. 26, No. 3 455-461
© 1985

Article

Analysis of the Variation Potential Induced by Wounding in Plants

G. Roblin

Université de Poitiers, Station Biologique de Beau-Site 25 Faubourg Saint-Cyprien, 86000 Poitiers, France

Following burning of a leaf portion, a bioelectrical wave called "variation potential" spread throughout the whole plant. Bioelectrical variations are recorded by two types of electrodes (platinum wires and Ag/AgCl nonpolarizable electrodes) in the stem of Vicia faba and in the petiole of Lycopersicon esculentum and Mimosa pudica. The time course of the variation potential thus recorded can be divided into two components respectively called components "A" and "B". Component A looks like a negative spiky bioelectrical change lasting about 1 min with an amplitude of 20–50 mV spreading in front of the component B depicted by a more smooth and long-lasting (several min) wave of negativity. An attenuation of the signals recorded under the Ag/AgCl electrodes is noted compared to that recorded under the platinum wires. Moreover, component B is more attenuated than the component A. Attenuation of the component A is nearly the same as that noted for the action potential in Mimosa pudica.

All the parameters depicting the variation potential increase approximately in direct proportion to the amount of the damaged area up to 400 mm2 in Vicia faba; above this value, a maximal response is reached.

(Received October 18, 1984; Accepted January 14, 1985)
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