Components of Axillary Bud Inhibition in Rose Plants. I. The Effect of Different Plant Parts (Correlative Inhibition)

Different plant parts inhibited the growth of axillary buds in Baccara roses. A segment of stem inhibited growth of buds just below Removal of the uppermost bud enhanced the sprouting of the bud immediately below, but buds lower down were unaffected by removing two or more upper buds. Both mature leaves and the stem itself played a role in this correlative inhibition Removal of a leaf enhanced the sprouting of the bud subtended by this leaf, although subsequent growth was reduced relative to that of a shoot whose subtending leaf had not been removed. The stem section above a bud had an effect similar to the leaf subtending the bud. The combined initial inhibitory effect of the stem section and leaf was more than additive