title: Toxic effects of pentachlorophenol on Lemna polyrhiza.
abstract: This paper reports the toxic effects of pentachlorophenol (PCP) on duckweed, Lemna polyrhiza. The 8-day IC(50) of PCP to L. polyrhiza was 8.08 mg/L. At 0.2 and 0.5 mg/L, PCP inhibited L. polyrhiza chloroplast activity. At low PCP exposures, chloroplast activity was more sensitive than chlorophyll content of L. polyrhiza. At 0.2 and 0.5mg/L, PCP stimulated L. polyrhiza nitrate reductase activity. At 0.2 and 0.5mg/L PCP, duckweed peroxidase activity was 78.3% and 91.0% of the control test, respectively. The bioaccumulation factors (BCFs) of PCP in L. polyrhiza were 79 and 62 at 0.2 and 0.5mg/L PCP, respectively. This is the first study of the effect of PCP on peroxidase activity, nitrate reductase activity, and chloroplast activity of L. polyrhiza. The BCFs of PCP in L. polyrhiza are also for reported the first time.
authors.affiliation: College of Material and Environmental Science, Qingdao University of Science & Technology, Quinado 266042, People's Republic of China. songhuey@sina.com
authors.forename: Zhihui
authors.initials: Z
authors.lastname: Song
authors.forename: Guolan
authors.initials: G
authors.lastname: Huang
mesh_terms: D029064:Araceae / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D050260:Carbohydrate Metabolism / Q000187:drug effects; D002734:Chlorophyll / Q000378:metabolism; D002736:Chloroplasts / Q000187:drug effects / Q000378:metabolism; D050901:Nitrate Reductase / Q000378:metabolism; D010416:Pentachlorophenol / Q000378:metabolism / Q000633:toxicity*; D009195:Peroxidase / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000378:metabolism / Q000633:toxicity*
chemical_list: D014874:Water Pollutants, Chemical; D002734:Chlorophyll; D010416:Pentachlorophenol; D009195:Peroxidase; D050901:Nitrate Reductase