Functions and deficiency symptoms of Magnesium
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Mg is a constituent of the chlorophyll molecule and located at its centre, without which photosynthesis by plants would not occur. It is a mobile element and plant absorb as Mg2+ ionic form.
Functions:
• Very much essential for photosynthesis. • It is involved in the regulation of cellular pH, cation-anion balance and turgur regulation of cells. • Necessary for protein synthesis. • Activator of enzymes in carbohydrate and ATP metabolism. • Essential for the formation of oils and fats • It is required for stabilization of cell membranes.
Deficiency:
¥ Interveinal chlorosis of lower leaves and in extreme cases becomes necrotic. ¥ Leaves remain in small and brittle even in final stages. ¥ Twigs may become weak and premature dropping of leaves results in heavy loss of fruit crops. ¥ Inhibits nitrate reduction and the production of photo hormones. ¥ Stalk necrosis or stem ‘Die back’ in a Vine plant. Excess of Mg absorption becomes poisonous leads to browning of roots as a result growth is ceased and death of roots and leaves. It can be counteracted by CO2 antagonistic action.
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Last modified: Friday, 2 December 2011, 7:30 AM