[Growth rate of the axillary buds and variation of the type of correlation between the cotyledon and its axillary bud in Bidens pilosus L].

Application of various growth substances to seedlings of Bidens with an inhibitory cotyledon causes a cotyledonary correlative stimulation. At the same time, if we measure the influence of these substances on the growth rate of the buds during the experiment, we see that the cotyledonary correlative stimulation is always associated with a decrease of this growth rate. If the control had an indifferent or stimulating cotyledon, the application of the same various substances either causes an increase of this cotyledonary correlative stimulation or brings about a cotyledonary correlative inhibition. In the first case a decrease of the growth rate is always noted, while the cotyledonary correlative inhibition is associated with an increase in the growth rate.