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Soil contamination with silver nanoparticles reduces Bishop pine growth and ectomycorrhizal diversity on pine roots.

Sweet, M J; Singleton, Ian

Authors

M J Sweet



Abstract

Soil contamination by silver nanoparticles (AgNP) is of potential environmental concern but little work has been carried out on the effect of such contamination on ectomycorrhizal fungi (EMF). EMF are essential to forest ecosystem functions as they are known to enhance growth of trees by nutrient transfer. In this study, soil was experimentally contaminated with AgNP (0, 350 and 790 mg Ag/kg) and planted with Bishop pine seedlings. The effect of AgNP was subsequently measured, assessing variation in pine growth and ectomycorrhizal diversity associated with the root system. After only 1 month, the highest AgNP level had significantly reduced the root length of pine seedlings, which in turn had a small effect on above ground plant biomass. However, after 4 months growth, both AgNP levels utilised had significantly reduced both pine root and shoot biomass. For example, even the lower levels of AgNP (350 mg Ag/kg) soil, reduced fresh root biomass by approximately 57 %. The root systems of the plants grown in AgNP-contaminated soils lacked the lateral and fine root development seen in the control plants (no AgNP). Although, only five different genera of EMF were found on roots of the control plants, only one genus Laccaria was found on roots of plants grown in soil containing 350 mg AgNP/kg. At the higher levels of AgNP contamination, no EMF were observed. Furthermore, extractable silver was found in soils containing AgNP, indicating potential dissolution of silver ions (Ag+) from the solid AgNP.

Citation

Sweet, M. J., & Singleton, I. (2015). Soil contamination with silver nanoparticles reduces Bishop pine growth and ectomycorrhizal diversity on pine roots. Journal of Nanoparticle Research, 17, 448. https://doi.org/10.1007/s11051-015-3246-4

Journal Article Type Article
Publication Date 2015
Deposit Date Jan 13, 2016
Publicly Available Date Jan 13, 2016
Print ISSN 1388-0764
Electronic ISSN 1572-896X
Publisher BMC
Peer Reviewed Peer Reviewed
Volume 17
Pages 448
DOI https://doi.org/10.1007/s11051-015-3246-4
Keywords AgNP; Fungi; Pine; Nanoparticle; Environmental effects;
Public URL http://researchrepository.napier.ac.uk/id/eprint/9428
Publisher URL http://dx.doi.org/10.1007/s11051-015-3246-4

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