ZhouPi
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Last Update: 2020-11-07
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Source: Internet
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Author: User
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Secondary protection that exists on surfaces with coarsely grown roots and stems
tissue
. When the roots and stems grow coarsely, the cells of the secondary tissue wood hydrant formation layer divide vertically, forming radially arranged cell columns, which are differentiated outward into the wood hydrant layer and inward into the inner layer of the hydrant. The wood bolt layer, the wood bolt formation layer and the inner layer of the bolt are jointly called the peri-skin, and the protective function is exercised instead of the damaged and shedded skin. The wood hydrant layer contains many layers of tightly arranged wood hydrant cells, which have thick cell walls and embolism (i.e., the accumulation of fatty substances made up of wood hydrant acid, etc.) in the cell wall. When the cell wall matures, the protosinosis disintegrats and dies, and the cytospheric cavity is filled with air, becoming a protective layer of highly impermeable, impervious, non-thermal and acid-resistant and multi-chemical action. After the formation of the peritic skin, the living cells under the periths exchange gas with the outside world through the pores present on the pereslisive skin. The shape, color, size and number of unit areas of the skin holes vary according to plant species and can be used as one of the basis for identifying tree species.
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