Effets comparés de la fusicoccine, de la kinétine et de l'ablation de l'axe principal sur le bourgeon cotylédonnaire inhibé du Pois nain

Abstract

The cotyledonary axillary buds with most of their nuclei in the G1 phase react to fusicoccin by showing a rapid elongation of their first two basal internodes. This elongation is achieved by the 15th h and is not accompanied by a passage of the nuclei to the S and G2 phases. In response to decapitation or to 6-furfurylaminopurine (6-FAP) application, DNA synthesis starts again. The cell cycle is released immediately upon decapitation or before subapical elongation starts in 6-FAP treated plants. These results are discussed in relation to the current concepts on the action of fusicoccin and hormonal factors on H+/K+ exchanges.