The Developmental Relationship between Primary and Secondary Thickening Growth in Cordyline (Agavaceae)

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Abstract
The primary thickening meristem (PTM) in C. terinalis (L.) Kunth is discontinuous with the secondary thickening meristem (STM) in vegetative shoots. The PTM and STM are separated by a region of pronounced internodal (shoot axis) elongation. In this region, growth mainly longitudinal; in the regions of the PTM and STM, growth is mainly radial. Pronounced radial growth and pronounced longitudinal growth apparently do not occur at the same time. Histological changes during inflorescence initiation and after rare reversions to the vegetative state were followed in plants induced to flower by gibberellin treatment. The PTM disappeared during inflorescence induction and a STM never developed in the inflorescence axis. In reversion shoots, a long internode is formed which does not form a normal STM. The PTM is a prerequisite for the later differentiation of the STM in an axis.

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