The protoderm, the fundamental meristem, and the procambium
can be identified throughout the embryonic structure by the shapes of their cells, sizes, and positions.
This finding implies that TDIF functions as a phloem-derived non-cell-autonomous signal that controls stem cell fate in the procambium
In the cortical fundamental meristem, a pro-endodermis is distinguishable, and pericycle and procambium
cylinder are also evident in the primary root apex (Figure 2B).
According to Diggle and DeMason (1983b), the transition of primary meristem into secondary meristem in the monocotyledonous species is analogous to the transition of procambium
to vascular cambium in the woody dicotyledonous stem.
El cambium propiamente dicho tiene doble origen, deriva en parte del procambium
y en parte por desdiferenciacion del parenquima de los radios medulares en el tallo (cambium interfascicular) y del periciclo en la raiz (pericambium).
The scutellum consists of cells that are richly cytoplasmic and irregularly shaped and contains tracheids in procambium
that is bordered by typical epithelial cells; this was previously observed in sugarcane by Guiderdoni and Demarly (1988).
In the interior, a series of parenquimatous type cells and in the center a vascular procambium
were observed (Figures 2c, d).