Document Detail

Root uptake and phytotoxicity of ZnO nanoparticles.
MedLine Citation:
PMID:  18754479     Owner:  NLM     Status:  MEDLINE    
Increasing application of nanotechnology highlights the need to clarify nanotoxicity. However, few researches have focused on phytotoxicity of nanomaterials; it is unknown whether plants can uptake and transport nanoparticles. This study was to examine cell internalization and upward translocation of ZnO nanoparticles by Lolium perenne (ryegrass). The dissolution of ZnO nanoparticles and its contribution to the toxicity on ryegrass were also investigated. Zn2+ ions were used to compare and verify the root uptake and phytotoxicity of ZnO nanoparticles in a hydroponic culture system. The root uptake and phytotoxicity were visualized by light scanning electron, and transmission electron microscopies. In the presence of ZnO nanoparticles, ryegrass biomass significantly reduced, root tips shrank, and root epidermal and cortical cells highly vacuolated or collapsed. Zn2+ ion concentrations in bulk nutrient solutions with ZnO nanoparticles were lower than the toxicity threshold of Zn2+ to the ryegrass; shoot Zn contents under ZnO nanoparticle treatments were much lower than that under Zn2+ treatments. Therefore, the phytotoxicity of ZnO nanoparticles was not directly from their limited dissolution in the bulk nutrient solution or rhizosphere. ZnO nanoparticles greatly adhered on to the rootsurface. Individual ZnO nanoparticles were observed present in apoplast and protoplast of the root endodermis and stele. However, translocation factors of Zn from root to shoot remained very low under ZnO nanoparticle treatments, and were much lower than that under Zn2+ treatments, implying that little (if any) ZnO nanoparticles could translocate up in the ryegrass in this study.
Daohui Lin; Baoshan Xing
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  42     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-08-29     Completed Date:  2008-12-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5580-5     Citation Subset:  IM    
Department of Environmental Science, Zhejiang University, Hangzhou 310028, China.
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MeSH Terms
Biological Transport
Lolium / drug effects*,  growth & development,  metabolism
Microscopy, Electron, Transmission
Nanoparticles / chemistry,  toxicity*
Plant Roots / drug effects*,  growth & development,  metabolism*
Scattering, Radiation
Water Pollutants, Chemical / metabolism,  toxicity*
Zinc Oxide / metabolism,  toxicity*
Reg. No./Substance:
0/Water Pollutants, Chemical; 1314-13-2/Zinc Oxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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