title: The fate of the herbicide propanil in plants of the littoral zone of the Three Gorges Reservoir (TGR), China.
abstract: The anti-seasonal hydrology with 30m water fluctuations in the Three Gorges Reservoir (TGR) of China attracts growing environmental and ecological concerns. We investigated the biotransformation of the herbicide propanil in plants dominating in the littoral zone of the TGR by applying the14C-ring-labeled herbicide into non-aseptic hydroponic plant systems (Cynodon dactylon, Nelumbo nucifera and Bidens pilosa), aseptic plants (Lemna minor and Lemna gibba) and cell suspension cultures (C. dactylon and L. minor). (1) Propanil absorbed in plants of the hydroponic systems was (12.46±1.63)% of applied radioactivity (AR) (C. dactylon), (52.36±6.38)% (N. nucifera) and (76.55±6.07)% (B. pilosa), respectively. The14C-residues in the plant extractable fractions and the corresponding media were confirmed by radio-Thin Layer Chromatography (TLC), radio-High Performance Liquid Chromatography (HPLC) and Gas Chromatography-Electron Ionization Mass Spectrometry (GC-EIMS) as propanil, 3,4-dichloroaniline (DCA) and N-(3,4-dichlorophenyl)-β-d-glucopyranosylamine (Glu-DCA). (2) About 8% of AR was taken up by both aseptic plants, from which 7.0% of AR was extracted and identified also as propanil, DCA and Glu-DCA. (3) Concerning cell suspension cultures, (39.22±9.39)% of AR was absorbed by C. dactylon after 72hr, whereas the accumulated14C-propanil by L. minor cell suspension culture amounted to (65.04±1.72)% after 7days. The identified compounds in cell cultures are consistent with those in the tested plants. Most of the pesticide residues in the intact plants were un-extractable, which are recognized as the end of the detoxification process. We therefore consider these plants as suitable for the phytoremediation of the herbicide propanil in the TGR region.
authors.affiliation: Institute for Environmental Research (Biology V), RWTH Aachen University, Aachen 52074, Germany. Electronic address: zhongli.chen@bio5.rwth-aachen.de.
authors.forename: Zhongli
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Institute for Environmental Research (Biology V), RWTH Aachen University, Aachen 52074, Germany; Nanjing University,School of the Environment, Nanjing 210023,China; Chongqing University, College of Resource and Environmental Science, Chongqing 400030, China. Electronic address: andreas.schaeffer@bio5.rwth-aachen.de.
authors.forename: Andreas
authors.initials: A
authors.lastname: Schäffer
mesh_terms: D002681:China; D004784:Environmental Monitoring; D006540:Herbicides / Q000032:analysis*; D010944:Plants / Q000737:chemistry* / Q000378:metabolism; D011411:Propanil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D006540:Herbicides; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D011411:Propanil
keywords: Non-extractable residues (NER); Plant degradation; Propanil; Three Gorges Reservoir (TGR)