Bioconcentration and Phytotoxicity of Cd in Eichhornia crassipes |
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Authors: | Kum Kum Mishra U N Rai Om Prakash |
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Institution: | (1) Plant Genetic Unit, Botany Department, Lucknow University, Lucknow, 226007, India;(2) Ecotoxicology and Bioremediation Group, National Botanical Research Institute, Lucknow, 226001, India;(3) Jawahar Navodaya Vidyalaya, Rohtak, West Sikkim, India |
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Abstract: | Plants of Eichhornia crassipes grown at various levels of cadmium ranging from 0.1 to 100 μg ml−1 accumulated Cd in a concentration and duration dependent manner. At all levels, Cd accumulation by various plant tissues
followed the order roots shoot leaves. Approximately 80% of total Cd was accumulated by plant at highest concentration (100 μg
ml−1) used in the experiment. Cadmium induced phytotoxicity appears at 25.0 μg ml−1 resulting into reduced levels of chlorophyll, protein and in vivo nitrate reductase activity of the plant. However, a slight induction of these physiological variables was obtained at lowest
Cd (0.1 μg ml−1) concentration. In contrast, carotenoid content increased at highest Cd concentration i.e., 100 μg ml−1. Similar effects at low and high levels of Cd was obtained with respect to mitotic index and micronuclei in root meristem
of the plant. It could be inferred that Cd toxicity in plant is differential depending upon the low and high concentration
of Cd in the medium. |
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Keywords: | cadmium Eichhornia crassipes phytotoxicity micronuclei assay |
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