Variations nycthémérales de l'intensité des corrélations entre les cotylédons et leur bourgeon axillaire induites par des traumatismes faits unilatéralement sur l'un des deux cotylédons de Bidens pilosus

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Abstract
Different methods (physiological, electrophysiological and biochemical) were used in order to show, during a 24 h period, a change in sensitivity of Bidens pilosus seedlings to the pricking of one of the cotyledons. The sensitivity is maximum in the morning and in the evening; it decreases during the light period (day) and the dark period (night). The minimum of the sensitivity occurs in the middle of the day and 3 to 4 h after the beginning of the night.