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Comparison of Trichloroethylene Toxicity, Removal, and Degradation by Varieties of Populus and Salix for Improved Phytoremediation Applications | OMICS International | Abstract
ISSN: 2155-6199

Journal of Bioremediation & Biodegradation
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Special Issue Article

Comparison of Trichloroethylene Toxicity, Removal, and Degradation by Varieties of Populus and Salix for Improved Phytoremediation Applications

Rachel S. Miller, Zareen Khan and Sharon L. Doty*
School of Forest Resources, College of the Environment, University of Washington, Seattle, WA 98195-2100, USA
Corresponding Author : Sharon Lafferty Doty
School of Forest Resources
College of the Environment, University of Washington
Seattle, WA 98195-2100,USA
Tel: (206)616-6255
Received: October 24, 2011; Accepted: November 23, 2011; Published: November 30, 2011
Citation: Miller RS, Khan Z, Doty SL (2011) Comparison of Trichloroethylene Toxicity, Removal, and Degradation by Varieties of Populus and Salix for Improved Phytoremediation Applications. J Bioremed Biodegrad S7:001. doi:10.4172/2155-6199.S7-001
Copyright: © 2011 Miller RS, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Trichloroethylene (TCE), a chlorinated organic solvent, is one of the three most common and widespread groundwater contaminants worldwide. Exposure to this contaminant has been linked to liver and kidney toxicity and cancer in humans and animals [1]. The Salicaceae family, which includes poplar and willow trees, has been very successful in phytoremediation efforts involving chlorinated solvents including TCE. Previous phytoremediation studies investigated removal of this contaminant using one or two genotypes, but a screening of a large number of genotypes in this family of plants had not yet been conducted. In this study, nine Populus and twelve Salix varieties were chosen for their previous success in phytoremediation efforts or local native significance, and experiments were conducted to compare toxicity, uptake, and degradation of TCE. Results from the toxicity screening demonstrated that hybrid poplar clones Crandon (Populus alba x grandidentata), Nisqually-1 (P. trichocarpa), D.Pa (P. alba) and willow clone S365 (Salix discolor) had the highest mass gain and best health at the highest TCE concentration. Percent removal of TCE in one week ranged from 19.2 to 44.9 with Crandon, P. deltoides hybrid 91x0403, poplar clone H11-11 (P. trichocarpa x deltoides), Salix sitchensis clone B, and Nisqually-1 all removing more than 40 percent of the TCE from hydroponic solution. In terms of TCE degradation, S. sitchensis clone B, poplar hybrid 91x0403, and hybrid poplar H11-11 had the most TCE metabolite, trichloroethanol, per gram of fresh plant weight, with the best performer, S. sitchensis clone B, having eight times the amount than the lowest genotype tested. These results indicated that there are significant differences in the ability of poplar and willow genotypes to remove and degrade TCE, and that many different genotypes could be successfully utilized for phytoremediation of TCE. This data set could be applied toward choosing the appropriate genotypes for the phytoremediation of TCE in a given location and climate.


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