Designation for the im cambium (Below the bark, growth layer) located tissues in higher plants as well as the Rebstock, This is the transport of nutrients and water from the roots to the tips of the shoots, The amazing transport speed is one-half to one meter per hour. There are two different, completely separate transport routes. The xylem consists of wide and thick-walled tubes through which the water taken up by the root hairs, with dissolved minerals and organic matter flows upwards. Parts of it form the wood. The phloem (Siebteil) consists of narrow and thin-walled tubes, above all the transport of the plant at the photosynthesis formed assimilates (organic molecules) takes place.
From parts of it arise the bast or the bark, which together form the bark called outermost layer. The pith rays (also wood rays) are part of the wood and pull through the xylem from the inside of the wood body to the cambium. This is the thin cell layer in front of the bark, which releases the cells of the bast as well as the cells of the wood to the outside in the course of the thickness growth. The medullary rays serve the radial supply of the wood body with water and nutrients from the center (mark) to the outside (cambium). at table grapes is there the technique of curling of in which a ring-shaped part with the phloem is removed from the stem or shoot. The conductive fabric is also from microorganisms used for propagation in the plants. In case of infestation by the phylloxera At the roots, the Leitgewebe is heavily affected, which makes this pest so dangerous. See also below physiology and Rebstock,