Differentiation of the organiser into a xylem vessel leads to formation of a new organiser in the adjacent cambial stem cell, thus ensuring the maintenance of the vascular cambium
. We also identified a molecular mechanism that defines the stem cell organiser."
The results presented here demonstrate the ability of an endophytic culture T asperellum to spread quickly from its point of inoculation in the leaf, vascular cambium
and root to all other parts of cacao seedlings.
The juvenilistic rays of Welwitschia are related to the fact they are produced within successive cambia, each of which has limited duration, although the vascular cambium
of each of the numerous vascular increments does produce secondary phloem and secondary xylem.
The union of tissues of the mini-grafting cleft is formed by the division of callus cells, originally from the graft and the rootstock, which then differentiate to form the vascular cambium
. Three consecutive steps occur in successful grafting: adhesion between graft and rootstock cells; proliferation of callus cells and vascular differentiation at the grafting interface (HARTMANN et al., 2011).
In order to reach the light over the tree canopies, these species develop a different activity in the vascular cambium
, which results in an unusual development of secondary vascular tissues that are not found in most of eudicots.
This can occur when some buds are alive but the regenerative vascular cambium
tissue is damaged.
Reserve substances to the parenchyma of the bark are usually connected to the supply of metabolites to vascular cambium
at the beginning of the growing season of plants, and the supply of carbon stocks necessary for the stimulation of growth after injury of organs (Machado et al., 2005; Larrosa & Duarte, 2005; Demarco et al., 2006; Palhares et al., 2007; Demarco & Castro, 2008; Krentkowski & Duarte, 2012).
In temperate regions, the vascular cambium
is dormant during winter and reactivates in spring.
Secondary xylem is bounded centripetally by primary xylem and sclerified pith (Figure 2) and centrifugally by vascular cambium
and phloem (Figure 3).
As in cedro, in many studies of woody species, the site origin has been located near to or in the vascular cambium
(Syros et al.
To prepare poplar bark for use as siding, the green bark is stripped in sheets from freshly harvested trees in the spring and early summer when the vascular cambium
is active and the bark can be easily removed.
* Vascular cambium
is found in the stems and roots of dicot plants and is a type of meristem that provides for increase in stem diameter.