kok-saghyz is covered with a well-developed periderm, consisting of phellem, phellogen
However, as in the caulirosula species, the secondary coating is formed by layers of suberized cells, which are discontinuous in the organ and do not form a periderm itself, because there is no phellogen
The cells in the outer layers of the bulb (epidermis) slit towards the tubers, while the cells in a layer beneath the epidermis (hypodermic) divide outwards with increasing carbohydrate content of tubers, a layer of cells that divide is called phellogen
Secondary growth is similar to verified type for most of the dicots roots, cambium with procambium, and phellogen
that also origins from pericycle.
Formation of the primary protective layer and phellogen
after leaf abscission in peach.
They are associated with the activity of phellogen
deposited in subepidermal cells typically at the microcrack formation site.
Concurrently, in the cortical region, there was a phellogen
differentiation among the first sub epidermal layers by the thickening of the external periclinal wall, which extends to the anticlinal walls (Figure 2i).
developed only in the cut edges of the bark bounding the wounded secondary phloem and became continuous with the phellogen
of original periderm of intact areas of the root.