Cambium

The cambium is a fabric being in the Tige S and the root S of the multiannual Dicotylédone S and the Gymnospermes. It is a secondary Méristème of these plants, which is formed starting from the Procambium, it is a unicellular layer located between wood and the bark. One distinguishes two types of cambium:

  • the wood-and-bast base or vascular cambium, which sets up the secondary conducting beams. It is most of the time a thin cylindrical layer between the liber (or Phloème) and the Bois (or Xylème). It develops towards the interior and outside. The new cells deposited on the interior are cells (large, lignified) of xylème secondary or secondary wood; the new cells outside are the cells of secondary phloem or secondary liber (small, alive but without core and cellulose; the secondary term differentiates these new fabrics from the xylème and phloem primary educations). The activity of this base ceases in winter and begins again in spring.
  • the subero-phellodermic base , located towards the periphery of the stem or the root, sets up external fabrics (Phelloderme towards the center of the stem and cork towards outside). A phellogen is active a few years, then is replaced by a new base which develops within the secondary phloem. This multiannual process led to the formation of structures having a relative complexity. The internal phellogen determines the limit beyond which all the peripheral fabrics, made up of died cells, form the rhytidome. Under the most recent phelloderm, the bark is interns (liber with the direction strict) constituted of alive cells.

The cambium is well-known in practice Greffage because to make a success of a clerk's office it is necessary to place cambium of the door grafts and the graft together.

Simple: Vascular cambium

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