Uptake and transformation of trichloroethylene by edible garden plants

Advances in Phytoremediation

“…Many investigators have had difficulty isolating and identifying the metabolic products termed bound residue (44)(45)(46). However, Newman et al (3) have reported TCE metabolism to trichloroethanol, trichloroacetic acid, and dichloroacetic acid in hybrid poplar.…”

Uptake of trifluralin and lindane from water by ryegrass

“…Parent compounds and their metabolites may form bound residues with plant components such as lignin and carbohydrates (Khan, 1980). Trichloroethanol was detected in tomatoes and poplar trees following trichloroethylene uptake, and the formation was ascribed to the oxidation of trichloroethylene by cytochrome P-450 (Newman et al, 1997;Schnabel et al, 1997). Bhadra et al, (1999a,b) reported that 2,4,6-trinitrotoluene was oxidized in Myriophyllum aquaticum to 2-amino-4,6-dinitrobenzoic acid, 2,4-dinitro-6-hydroxybenzyl alcohol, 2-N-acetoxyamino-4,6-dinitrobenzaldehyde, 2,4-dinitro-6-hydroxytoluene, and two binuclear metabolites.…”

FY01 Phytoremediation of Chlorinated Ethenes in Southern Sector Seepline Sediments of SRS

“…Select plants, including hybrid poplars, are capable of TCE metabolism and transformation (Newman et al 1997 andSchnabel et al 1997). The two tree species selected for this study based on their phytoremediation potential were the loblolly pine, L. cuneata, and a hybrid poplar, Trichocarpa X deltoides.…”

“…Some rhizospheric microorganisms secrete hormones that increase root growth, and thereby the secretion of root exudates that contain metabolites, including proteins and carbohydrates, used by the bacteria (Shann 1995). Exudation of organics by plant roots and turnover of organic root biomass have also been found to increase the TCE sorption capacity of soil (Schnabel et al 1997). There are knowledge gaps as to which mechanism provides the higher degree of VOC removal in phytoremediation systems, the plants or the associated rhizospheric bacteria (Orchard et al 2000a).…”

“…The groundwater and associated compounds dissolved in it moves through the rhizosphere, where it is subjected to processing by microorganisms before it enters the root system. In some instances, the magnitude of microbial transformation of TCE can be significantly larger than plant influence (Anderson and Walton 1995) although this depends on the site and plants used (Nichols et al 1997 andSchnabel et al 1997). …”