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Research Journal of Phytochemistry
  Year: 2007 | Volume: 1 | Issue: 2 | Page No.: 52-60
DOI: 10.3923/rjphyto.2007.52.60
Characterization of Manganese Toxicity and its Influence on Nutrient Uptake, Antioxidant Enzymes and Biochemical Parameters in Tea
S. Venkatesan , K.V. Hemalatha and S. Jayaganesh

Abstract:
Soil acidification enhances the solubility of metals such as Mn and Al, resulting in phytotoxicity including suppression in growth and yield. A potted plant experiment was conducted by adding manganese externally to the soil. There were seven treatments and three replications. Irregular brown spots all over the leaf surface right from the petiole up to the leaf tip between the marginal veins was found to be specific toxicity symptoms. The surviving plants were uprooted and separated into leaves, stem, root and soil on which the chemical analyses were carried out. At any given treatment, the accumulation of manganese was higher in leaf than that of root and stem. The critical toxic limit of manganese in root, stem and leaf was found to be 584, 892 and 4784 mg kg-1, respectively. The phosphorus content decreased with increase in manganese concentration in soil and all plant parts. High manganese levels in soils led to plant nutrient imbalances especially in relation to other divalent cations such as Mg2+, Ca2+, Zn2+ and Fe2+. Significant decrease in amino acid, chlorophyll and carotenoid content of leaves was noted due to external addition of manganese, while catechin and polyphenol contents increased significantly. The activity of catalase was significantly higher till 1000 mg Mn kg-1 of soil. The peroxidase activity increased significantly due to the increase in manganese addition.
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How to cite this article:

S. Venkatesan , K.V. Hemalatha and S. Jayaganesh , 2007. Characterization of Manganese Toxicity and its Influence on Nutrient Uptake, Antioxidant Enzymes and Biochemical Parameters in Tea. Research Journal of Phytochemistry, 1: 52-60.

DOI: 10.3923/rjphyto.2007.52.60

URL: https://scialert.net/abstract/?doi=rjphyto.2007.52.60

 
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