Abstract
Pricking one cotyledon of decapitated plantlets of Bidens pilosus L. induces, i) the induction of a wave of electric depolarization progressing towards the bud at the axil of this cotyledon, and ii) the inhibition of the growth of this bud. The electrophysiologic and morphogenetic responses are dependent on the number of pricks and on the location of these pricks on the cotyledon midribs. When a prick is delivered on the hypocotyl prior to those on the cotyledons, then it prevents the effect of the latter pricks. When it is delivered after those on the cotyledons, it does not change the effects of cotyledon pricking. Our experiments suggest that there is a causal relationship between the electrophysiological and morphogenetic responses.
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