Propagation in Vicia faba Stem of a Potential Variation Induced by Wounding

概要

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Heating of leaf blade in Vicia faba triggered bioelectrical events ("variation potential") spreading throughout the shoot, preferentially in the acropetal direction. The spreading of a variation potential, previously described in Mimosa and other plants, is related to a concomitant transport of a stimulating substance in the transpiration stream. This conclusion is supported by the observation in Vicia faba stem that conduction in the basipetal direction is promoted when the transpiration stream is inverted. The conduction is promoted in the vascular bundles in direct relation with the burnt lobe of the leaf, but a lateral conduction may exist, as electrical variations are recorded in isolated bundles of the orthostichy opposite to the wounded leaf. A local cooling (1℃) of the stem has no influence on the conduction rate but it completely inhibits the bioelectrical variations in the cooled zone. This last result reinforces earlier demonstrations that the substance is transported in the vessels, according to a physical process, but that the electrical events require metabolic integrality in other cellular members.
日本植物生理学会の論文