Studies of toxic effects of Hg(II) on Pistia stratiotes |
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| Authors: | Anil K De Asit K Sen Deb P Modak Sasadhar Jana |
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| Institution: | 1. Department of Chemistry, Visva-Bharati University, Santiniketan, 731235, West Bengal, India
2. Plant Physiology and Biochemistry Laboratory, Department of Botany, Visva-Bharati University, 731235, Santiniketan, India
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| Abstract: | The uptake of Hg(II) and toxicity effect of the metal on some biochemical parameters in Pistia stratiotes L. were studied. The uptake of Hg(II) by the plants gradually increased with increase in concentration of Hg(II) in the culture medium. Maximum accumulation of Hg(II) was noted within 1 day. Maximum removal (about 90%) of Hg(II) was recorded below 20 ppm Hg(II). Accumulation of Hg(II) in roots was about four times higher than that in shoots. At 20 ppm, Hg(II) promoted senescence of Pistia plants by decreasing chlorophyll, protein, RNA, dry weight and activities of catalase and protease as well as increasing free amino acid content, peroxidase activity and the ratio of acid to alkaline pyrophosphatase activity over control values. At Hg concentrations below 20 ppm, these constituents were least affected. |
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