Characterisation of Magnesium Toxicity, its Influence on Amino Acid Synthesis Pathway and Biochemical Parameters of Tea


	Research Journal of Phytochemistry
	Year: 2010 \| Volume: 4 \| Issue: 2 \| Page No.: 67-77 DOI: 10.3923/rjphyto.2010.67.77

Characterisation of Magnesium Toxicity, its Influence on Amino Acid Synthesis Pathway and Biochemical Parameters of Tea

Selvaraj Venkatesan and Sankar Jayaganesh

Abstract: The excess potassium (K) application to the soil reduces the availability of magnesium (Mg) and vice versa due to antagonism. A pot culture experiment was carried out in which pots were filled with 4 kg of soil to which magnesium sulphate was added externally so as to have 100, 250, 500, 750, 1000, 2000, 5000 and 10000 mg of Mg kg^-1 of soil. Excess magnesium has induced some toxicity symptoms like development of coppery color along the marginal veins at the initial stage. The mid rib region was also slightly affected. Extensive coppery color developed all over the leaf surface and defoliation of leaf occurred during the final staged of toxicity. The plant, which received 10000 mg of Mg²⁺ kg^-1 died on 20th day after imposing treatments and the plants, which received 5000 mg of Mg²⁺ kg^-1, died on 45th day. The surviving plants were uprooted and separated into leaves, stem, root and soil, on which chemical analysis was carried out. Surprisingly, at any given treatment the accumulation of Mg in root was higher than that of leaf and stem. This study confirmed the antagonism existing between K and Mg and synergism existing between the P and Mg. The amino acid content increased in tea leaf up to 1000 mg treatment and then gradually decreased.

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How to cite this article:

Selvaraj Venkatesan and Sankar Jayaganesh, 2010. Characterisation of Magnesium Toxicity, its Influence on Amino Acid Synthesis Pathway and Biochemical Parameters of Tea. Research Journal of Phytochemistry, 4: 67-77.

DOI: 10.3923/rjphyto.2010.67.77

URL: https://scialert.net/abstract/?doi=rjphyto.2010.67.77

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