Heavy Metals and Phytoremediation
Del Campo, Claudia M. , Rubin, Baruch , Tel-Or, Elisha .
Potential of Pistia stratiotes L. for phytoremediation of atrazine-polluted waters: plant response to and uptake of atrazine.
To evaluate the potential of Pistia stratiotes L. for phytoremediation of atrazine-polluted waters, the response to and the uptake of atrazine by this species was studied. The effect of atrazine concentration on plant biomass production and on atrazine removal from water was assessed in hydroponics with three atrazine treatments: 0.5, 1, and 10 mg/l for 18 days. Throughout the time of cultivation, biomass production (increase in fresh weight) of plants in the treatment 0.5 mg/l was comparable to that of controls (without atrazine), whereas in the treatments 1 and 10 mg/l, it decreased after 6 days of cultivation. Atrazine removal from solution was between 30 and 40 % in all treatments until day 12 of cultivation; after this, removal decreased in the treatments 1 and 10 mg/l. These results indicate that, although atrazine concentration above 1 mg/l affects plant biomass production, P. stratiotes is able to remove atrazine continuously, for at least 12 days, from water that contains up to 10 mg/l. Atrazine uptake by P. stratiotes was studied by cultivating plants with solution containing 1 mg/l atrazine spiked with 14C-atrazine for 8 days. Atrazine concentration in the plants increased constantly during the time of cultivation; shoots concentration was five times larger than in the roots. Autoradiography of shoots and roots revealed atrazine accumulation in the leaf tip; accordingly, herbicide injury was observed in the leaf tip expanding towards the center of the lamina. Our findings demonstrate that plants of P. stratiotes take up atrazine, translocate it from roots to shoots, and accumulate it in the leaves. Thus, this species seems promising for phytoremediation of atrazine-polluted waters. The fate of atrazine in the plant tissues is under investigation.
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1 - The Faculty of Agriculture, The Hebrew University of Jerusalem, RH Smith Institute of Plant Sciences and Genetics in Agriculture, Building A Lab. 2322 (Prof. Elisha Tel-Or), Rehovot, 76100, Israel
2 - The Faculty of Agriculture, The Hebrew University of Jerusalem, RH Smith Institute of Plant Sciences and Genetics in Agriculture
Presentation Type: Plant Biology Abstract
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM