The cell wall is differentiated into three parts middle lamella, primary wall and secondary wall.
(i) Middle lamella:
(i) It is a thin amorphous cementing layer between two adjacent cells.
(ii) It is the first layer, which is deposited at the time of cytokinesis.
(iii) It is composed of calcium and magnesium pectate.
(ii) primary wall:
(i) It is thin, elastic and extensible in growing cell.
(ii) it grows by addition of wall material within the existing one. Such growth is termed as intussusception susception.
(iii) This wall consist of a loose network of cellulose microfibrils.
(iv) These microfibrils in fungi are made up of a polymer of acetyl glucosamine.
(v) The matrix of wall is chiefly composed of water, hemicellulose, pectins and glycoproteins.
(iii) Secondary wall:
(i) After maturity, a thick secondary wall is laid inner to the primary wall by accretion or deposition of materials. It is found in many layers.
(ii) A number of different materials may be deposited in the secondary wall, e.g., lignin and suberin.
Fig. Structure of the cell wall
