a Overview of the apical portion of the stem showing the medullary thickening (MT), the cortical thickening (CT), the
procambium located horizontally (red arrowheads) and extremely short intemodes.
The explants (2mm thickness and 4mm in diameter) were obtained from seed segments containing the
procambium region as described by Santos-Filho et al.
2e) was observed, as well as cell division leading to
procambium formation (Fig.
Fifteen days after the callus isolation on a SI medium, it was possible to observe in a sample of 'RB93509' cultivar the connection of shoot meristems with
procambium tissues (Figure 2B).
Despite the lack of knowledge on the molecular nature of this network, the available data implicate gradually restricted transport routes of the plant hormone auxin in defining sites of
procambium formation [16].
primary xylem: Derived from
procambium and divided into the earlier protoxylem and the later metaxylem.
diversifolia include the occurrence of a nodulated ring of
procambium from which vascular bundles develop, and the maintenance of discrete wedge-shaped tissues, an aggregate of primary and secondary vascular tissues at the early part of secondary growth.