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Silver nanoparticles disrupt wheat (Triticum aestivum L.) growth in a sand matrix.
Environ Sci Technol. 2013 Jan 15; 47(2):1082-90.ES

Abstract

Hydroponic plant growth studies indicate that silver nanoparticles (Ag NPs) are phytotoxic. In this work, the phytotoxicity of commercial Ag NPs (10 nm) was evaluated in a sand growth matrix. Both NPs and soluble Ag were recovered from water extracts of the sand after growth of plants challenged with the commercial product; the surface charge of the Ag NPs in this extract was slightly reduced compared to the stock NPs. The Ag NPs reduced the length of shoots and roots of wheat in a dose-dependent manner. Furthermore, 2.5 mg/kg of the NPs increased branching in the roots of wheat (Triticum aestivum L.), thereby affecting plant biomass. Micron-sized (bulk) Ag particles (2.5 mg/kg) as well as Ag ions (63 μg Ag/kg) equivalent to the amount of soluble Ag in planted sand with Ag NPs (2.5 mg/kg) did not affect plant growth compared to control. In contrast, higher levels of Ag ions (2.5 mg/kg) reduced plant growth to a similar extent as the Ag NPs. Accumulation of Ag was detected in the shoots, indicating an uptake and transport of the metal from the Ag NPs in the sand. Transmision electron microscopy indicated that Ag NPs were present in shoots of plants with roots exposed to the Ag NPs or high levels of Ag ions. Both of these treatments caused oxidative stress in roots, as indicated by accumulation of oxidized glutathione, and induced expression of a gene encoding a metallothionein involved in detoxification by metal ion sequestration. Our findings demonstrate the potential effects of environmental contamination by Ag NPs on the metabolism and growth of food crops in a solid matrix.

Authors+Show Affiliations

Department of Biology, Utah State University, Logan, Utah 84322, USA. cdimkpa@usu.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

23259709

Citation

Dimkpa, Christian O., et al. "Silver Nanoparticles Disrupt Wheat (Triticum Aestivum L.) Growth in a Sand Matrix." Environmental Science & Technology, vol. 47, no. 2, 2013, pp. 1082-90.
Dimkpa CO, McLean JE, Martineau N, et al. Silver nanoparticles disrupt wheat (Triticum aestivum L.) growth in a sand matrix. Environ Sci Technol. 2013;47(2):1082-90.
Dimkpa, C. O., McLean, J. E., Martineau, N., Britt, D. W., Haverkamp, R., & Anderson, A. J. (2013). Silver nanoparticles disrupt wheat (Triticum aestivum L.) growth in a sand matrix. Environmental Science & Technology, 47(2), 1082-90. https://doi.org/10.1021/es302973y
Dimkpa CO, et al. Silver Nanoparticles Disrupt Wheat (Triticum Aestivum L.) Growth in a Sand Matrix. Environ Sci Technol. 2013 Jan 15;47(2):1082-90. PubMed PMID: 23259709.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Silver nanoparticles disrupt wheat (Triticum aestivum L.) growth in a sand matrix. AU - Dimkpa,Christian O, AU - McLean,Joan E, AU - Martineau,Nicole, AU - Britt,David W, AU - Haverkamp,Richard, AU - Anderson,Anne J, Y1 - 2013/01/07/ PY - 2012/12/25/entrez PY - 2012/12/25/pubmed PY - 2013/6/26/medline SP - 1082 EP - 90 JF - Environmental science & technology JO - Environ Sci Technol VL - 47 IS - 2 N2 - Hydroponic plant growth studies indicate that silver nanoparticles (Ag NPs) are phytotoxic. In this work, the phytotoxicity of commercial Ag NPs (10 nm) was evaluated in a sand growth matrix. Both NPs and soluble Ag were recovered from water extracts of the sand after growth of plants challenged with the commercial product; the surface charge of the Ag NPs in this extract was slightly reduced compared to the stock NPs. The Ag NPs reduced the length of shoots and roots of wheat in a dose-dependent manner. Furthermore, 2.5 mg/kg of the NPs increased branching in the roots of wheat (Triticum aestivum L.), thereby affecting plant biomass. Micron-sized (bulk) Ag particles (2.5 mg/kg) as well as Ag ions (63 μg Ag/kg) equivalent to the amount of soluble Ag in planted sand with Ag NPs (2.5 mg/kg) did not affect plant growth compared to control. In contrast, higher levels of Ag ions (2.5 mg/kg) reduced plant growth to a similar extent as the Ag NPs. Accumulation of Ag was detected in the shoots, indicating an uptake and transport of the metal from the Ag NPs in the sand. Transmision electron microscopy indicated that Ag NPs were present in shoots of plants with roots exposed to the Ag NPs or high levels of Ag ions. Both of these treatments caused oxidative stress in roots, as indicated by accumulation of oxidized glutathione, and induced expression of a gene encoding a metallothionein involved in detoxification by metal ion sequestration. Our findings demonstrate the potential effects of environmental contamination by Ag NPs on the metabolism and growth of food crops in a solid matrix. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/23259709/Silver_nanoparticles_disrupt_wheat__Triticum_aestivum_L___growth_in_a_sand_matrix_ L2 - https://doi.org/10.1021/es302973y DB - PRIME DP - Unbound Medicine ER -