Activité mitotique et croissance des bourgeons axillaires provoquées par la décapitation de jeunes plants de fève (Vicia faba)

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Abstract
Buds of intact plants of V. faba L. are partially inhibited. Decapitation of the terminal bud of plants with 4 leaves leads to the reactivation of all the axillary buds, but to the growth of only the basal ones. The 1st events induced by the terminal bud excision do not occur at the level of the axillary buds, but affect rather the main axis. The kinetic study of the mitotic reactivation shows that the activation begins in cell layers of the cambial zone in the subapical internodes of the stem 1 h after decapitation and after 4 h in the more basal ones. The subapical axillary buds are first reactivated, but only temporarily, 8 h after the principal bud excision. The lower axillary buds are reactivated later, after 12 h, and their growth then becomes autonomous. These results are discussed with regard to the regulatory role of the main axis on axillary bud growth.