🛑Major Role of Nutrients
Various elements perform the following major role in the plants:
(1) Construction of the plant body: The elements particularly C, H and O construct the plant body by entering into the constitution of cell wall and protoplasm. They are, therefore, referred to as frame work elements. Besides, these (C, H and O) N, P and S also enter in the constitution of protoplasm. They are described as protoplasmic elements.
(2) Maintenance of osmotic pressure: Various minerals present in the cell sap in organic or inorganic form maintain the osmotic pressure of the cell.
(3) Maintenance of permeability of cytomembranes: The minerals, particularly Ca++, K+ and Na+ maintain the permeability of cytomembranes.
(4) Influence the pH of the cell sap: Different cations and anions influence on the pH of the cell sap.
(5) Catalysis of biochemical reaction: Several elements particularly Fe, Ca, Mg, Mn, Zn, Cu, Cl act as metallic catalyst in biochemical reactions.
(6) Toxic effects: Minerals like Cu, As, etc. impart toxic effect on the protoplasm under specific conditions.
(7) Balancing function: Some minerals or their salts act against the harmful effect of the other nutrients, thus balancing each other
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