Plant cell wall
The wall is found in plant cells in the periphery of a thick wall, is one of the main features are different from animal cells. By the cell layer, primary wall, secondary wall of three parts. The main components of polysaccharides. In a certain form, enhance the mechanical strength of cell wall is involved in the maintenance of cells, and is also associated with the physiological activities of cells.
Plant cell wall
In the part of plant cell growth stopped, the primary wall inside the cell wall layer continues to accumulate, in plasma membrane
Between the primary wall and. The cell wall is filled and attached Lignin
That can make the cell wall hardness increase, Cell group
Increase the mechanical force, the filling process is called lignin Lignification
Plant cell wall Form plant cell
Is different from the plant cell wall Animal cells
One of the main features. The main component is cellulose and pectin
Consists of three parts:
(1) The cell layer
. also called Mesogloea
. Located between two adjacent cells, two adjacent cells shared by a layer of film, as the main component Pectin
. Help the adjacent cell adhesion together, and can squeeze the buffer between cells.
(2) primary wall. After cell division, initially secreted by protoplasts of cell wall formation. In all living cells of plants. Located inside the cell layer. Usually thin, about 1 to 3 microns thick. With greater plasticity, which enables the cell to maintain a certain shape, but also with the cell growth and extension. The main components of cellulose, hemicellulose, and protein structure. Cells in the primary wall formation, if no new wall accumulation, the primary wall is their permanent cell wall. Such as the parenchyma cells.
(3) Secondary wall
. Part plant cell
To stop growing, the primary wall inside the cell wall layer to accumulate. Located between the plasma membrane and the primary wall. The main component is cellulose, and often have wood there. Are usually thick, about 5 to 10 microns, and hard, the cell wall has great mechanical strength. Most out of secondary wall cells in mature, protoplast death. Fiber and stone cell is a typical secondary cell wall. In plant protoplast culture, commonly used with pectinase and cellulase enzyme mixture treatment plant tissue to damage the cell layer and the outer wall of the cellulose to remove cells, get naked protoplast free.
Plant cell wall Characteristic
Woody: cell wall filled and attached Lignin
That can make the cell wall hardness increases, increase the mechanical force of cells. The filling process is called lignin lignified. Suberification
: the increase in fatty compounds in the cell wall Corky
And it is a simple cell, not breathable, not easily by the water, so the resulting finally in cells Protoplast
Completely disappeared. This filling Aliphatic compounds
The process is called suberification. Keratosis
Refers to: Epidermis
A layer of horny side wall contact air formed on the cover on the wall outside (also a fatty acid) membrane, can reduce plant water loss, prevent mechanical damage, insect feeding and pathogen infection, but also adjust the exposure of plants under temperature. The cuticular membrane does not affect the light transmittance of transparent.
Mineralization: refers to minerals such as calcium, silicon accumulation in cell walls, can increase the hardness and the protection function of organizational structure. Gramineae, Cyperaceae and plant stems, leaves skin wall often accumulation of siliceous and silica.
Intermediate fiber: third kinds of fiber structure of the cytoskeleton that secondary fiber or intermediate filament (intermediatefilment, IF), also known as intermediate filaments, bone like hollow structure, between the diameter between microtubules and microfilaments, its chemical composition is more complex, in different cells, composition changed greatly.