Accumulation of cadmium, lead and strontium, and a role of calcium oxalate in water hyacinth tolerance |
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Authors: | A M A Mazen O M O El Maghraby |
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Institution: | (1) Botany Department, Faculty of Sciences at Sohag, South Valley University, Sohag, 82524, Egypt |
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Abstract: | Eichhornia crassipes plants brought from the River Nile were cultured in jars containing river water supplemented with various
concentrations of Cd, Pb, and Sr (0 to 100 μg cm-3), added simultaneously. Treatment continued for 20 d during which each
cultivation solution was being replaced with fresh one every 3 d. The growth of Eichhornia was drastically retarded at heavy
metal concentrations higher than 15 μg cm-3. At concentrations 15 or 25 μg cm-3, the accumulation of Cd and Pb to levels several
times higher than those in control plants was found. More than 50 % of the uptaken metals were retained by roots alone. Leaves
and leaf petiols received around 30 and 20 % of the accumulated metals, respectively. X-ray microanalysis indicated the presence
of the three heavy metals in Ca oxalate crystals. Content of metals in the crystals increased progressively over time of exposure
in a way similar to those in whole plant tissues. These results suggest a possible role for Ca oxalate crystalization in toxic
heavy metal deposition and thus tolerance by Eichhornia.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | Ca oxalate crystals Eichhornia crassipes heavy metals pollution |
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