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Variation potential (VP) induced by local burning of a pea leaf: (A) the typical record of electrical reaction; (B) VP amplitude in the first, second and third leaves, located below the stimulated leaf; (C) the time interval between stimulation and the VP occurrence in the first, second and third leaves. (A): the red arrow indicates the moment of stimulation. (B,C): different letters denote significant differences between columns, p < 0.05.
