期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 23, 期 2, 页码 1755-1767出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-015-5414-6
关键词
Metal interactions; Comet assay; White clover; Heavy metals; Oxidative stress; Higher plants
资金
- ADEME (Agence De l'Environnement et de la Maitrise de l'Energie)
- Anses (Agence nationale de securite sanitaire de l'alimentation, de l'environnement et du travail)
- ADEME
- IRENI (Institut de Recherche en ENvironnement Industriel)
- RegionNord/Pas-de-Calais
The present study was designed to investigate the combined effects of Cd and Pb on accumulation and genotoxic potential in white clover (Trifolium repens). For this purpose, T. repens was exposed to contaminated soils (2.5-20 mg kg(-1) cadmium (Cd), 250-2000 mg kg(-1) lead (Pb) and a mixture of these two heavy metals) for 3, 10 and 56 days. The resulting bioaccumulation of Cd and Pb, DNA damage (comet assay) and peroxidase activities (APOX and GPOX) were determined. The exposure time is a determinant factor in experiments designed to measure the influence of heavy metal contamination. The accumulation of Cd or Pb resulting from exposure to the two-metal mixture does not appear to depend significantly on whether the white clover is exposed to soil containing one heavy metal or both. However, when T. repens is exposed to a Cd/Pb mixture, the percentage of DNA damage is lower than when the plant is exposed to monometallic Cd. DNA damage is close to that observed in the case of monometallic Pb exposure. Peroxidase activity cannot be associated with DNA damage under these experimental conditions.
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