Abstract
There is a marked change in the structure and dimensions of the shootab apex during a plastochron. The plastochronic changes are described in three phases: pre-leaf initiation, leaf initiation and post-leaf initiation. There is a cup-shaped cambium-like zone developed for a short duration during a plastochron. The origin of the axillary bud is from the peripheral meristem of the main shoot apex and its early development is due to the anticlinal divisions in tunica cells and multiplane divisions and growth in the corpus cells. There are two bud traces, in the form of residual meristem, for an early bud meristem. The procambialisation occurs acropetally.
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