12/22/2023 0 Comments 6 macro nutrients![]() (iii) Phosphorus is a constituent of the coenzymes NAD + and NADP +, which take part in most of the cellular oxidation-reduction reactions involving hydrogen transfer. The most abundant phosphoglycerides in higher plants are phosphatidyl ethanol amine and phosphatidyl choline (lecithin). (ii) Phosphorus is a constituent of phospholipids or phosphoglycerides or glycerol phosphatides which along with proteins, are characteristic major components of cell membranes only very small amounts of phosphoglycerides occur elsewhere in cells. Triphosphate forms of nucleotides are precursors of nucleic acids. Both DNA and RNA have a sugar-phosphate backbone in their structures. ![]() (i) It is a constituent of nucleic acids. (iv) The starch content is increased with the decrease in protein content. As a result a purplish colouration appears in stems, petioles, and lower leaf surfaces. (iii) In some cases production and accumulation of anthocyanin pigments is found. (ii) This yellowing symptom appears last in the younger leaves, because they receive soluble forms of nitrogen transported from older leaves. In severe cases these leaves become completely yellow and then light tan as they die and frequently fall off the plant. (i) A general chlorosis, i.e., the yellowing of leaves, especially in the older leaves, due to a loss in chlorophyll content appears first. ![]() (v) Other compounds in the plant such as some vitamins contain nitrogen. (iv) The coenzymes like NAD +, NADP +, FAD, etc., are essential to the function of many enzymes and nitrogen is a structural component of these coenzymes. (iii) Nitrogen is found in the structure of porphyrin molecules which are the percursors of chlorophyll pigments and cytochromes that are essential in photosynthesis and respiration. (ii) It is the constituent of such important biomolecules like purines and pyrimidine’s which are found in DNA and RNA. ![]()
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