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Salts affect the interaction of ZnO or CuO nanoparticles with wheat.
Environ Toxicol Chem. 2015 Sep; 34(9):2116-25.ET

Abstract

Exposure to nanoparticles (NPs) that release metals with potential phytotoxicity could pose problems in agriculture. The authors of the present study used growth in a model growth matrix, sand, to examine the influence of 5 mmol/kg of Na, K, or Ca (added as Cl salts) and root exudates on transformation and changes to the bioactivity of copper(II) oxide (CuO) and zinc oxide (ZnO) NPs on wheat. These salt levels are found in saline agricultural soils. After 14 d of seedling growth, particles with crystallinity typical of CuO or ZnO remained in the aqueous fraction from the sand; particles had negative surface charges that differed with NP type and salt, but salt did not alter particle agglomeration. Reduction in shoot and root elongation and lateral root induction by ZnO NPs were mitigated by all salts. However, whereas Na and K promoted Zn loading into shoots, Ca reduced loading, suggesting that competition with Zn ions for uptake occurred. With CuO NPs, plant growth and loading was modified equally by all salts, consistent with major interaction with the plant with CuO rather than Cu ions. Thus, for both NPs, loading into plant tissues was not solely dependent on ion solubility. These findings indicated that salts in agricultural soils could modify the phytotoxicity of NPs.

Authors+Show Affiliations

Department of Biology, Utah State University, Logan, Utah, USA.Department of Biology, Utah State University, Logan, Utah, USA.Utah Water Research Laboratory, Utah State University, Logan, Utah, USA.Utah Water Research Laboratory, Utah State University, Logan, Utah, USA.Chemistry and Biochemistry Department, Utah State University, Logan, Utah, USA.Biological Engineering Department, Utah State University, Logan, Utah, USA.Department of Biology, Utah State University, Logan, Utah, USA.Department of Biology, Utah State University, Logan, Utah, USA.

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

25917258

Citation

Stewart, Jacob, et al. "Salts Affect the Interaction of ZnO or CuO Nanoparticles With Wheat." Environmental Toxicology and Chemistry, vol. 34, no. 9, 2015, pp. 2116-25.
Stewart J, Hansen T, McLean JE, et al. Salts affect the interaction of ZnO or CuO nanoparticles with wheat. Environ Toxicol Chem. 2015;34(9):2116-25.
Stewart, J., Hansen, T., McLean, J. E., McManus, P., Das, S., Britt, D. W., Anderson, A. J., & Dimkpa, C. O. (2015). Salts affect the interaction of ZnO or CuO nanoparticles with wheat. Environmental Toxicology and Chemistry, 34(9), 2116-25. https://doi.org/10.1002/etc.3037
Stewart J, et al. Salts Affect the Interaction of ZnO or CuO Nanoparticles With Wheat. Environ Toxicol Chem. 2015;34(9):2116-25. PubMed PMID: 25917258.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Salts affect the interaction of ZnO or CuO nanoparticles with wheat. AU - Stewart,Jacob, AU - Hansen,Trevor, AU - McLean,Joan E, AU - McManus,Paul, AU - Das,Siddhartha, AU - Britt,David W, AU - Anderson,Anne J, AU - Dimkpa,Christian O, PY - 2015/02/06/received PY - 2015/03/26/revised PY - 2015/04/22/accepted PY - 2015/4/29/entrez PY - 2015/4/29/pubmed PY - 2016/4/5/medline KW - Bioaccumulation KW - Dissolution KW - Lateral root proliferation KW - Metal oxide nanoparticles KW - Salts KW - Wheat SP - 2116 EP - 25 JF - Environmental toxicology and chemistry JO - Environ. Toxicol. Chem. VL - 34 IS - 9 N2 - Exposure to nanoparticles (NPs) that release metals with potential phytotoxicity could pose problems in agriculture. The authors of the present study used growth in a model growth matrix, sand, to examine the influence of 5 mmol/kg of Na, K, or Ca (added as Cl salts) and root exudates on transformation and changes to the bioactivity of copper(II) oxide (CuO) and zinc oxide (ZnO) NPs on wheat. These salt levels are found in saline agricultural soils. After 14 d of seedling growth, particles with crystallinity typical of CuO or ZnO remained in the aqueous fraction from the sand; particles had negative surface charges that differed with NP type and salt, but salt did not alter particle agglomeration. Reduction in shoot and root elongation and lateral root induction by ZnO NPs were mitigated by all salts. However, whereas Na and K promoted Zn loading into shoots, Ca reduced loading, suggesting that competition with Zn ions for uptake occurred. With CuO NPs, plant growth and loading was modified equally by all salts, consistent with major interaction with the plant with CuO rather than Cu ions. Thus, for both NPs, loading into plant tissues was not solely dependent on ion solubility. These findings indicated that salts in agricultural soils could modify the phytotoxicity of NPs. SN - 1552-8618 UR - https://www.unboundmedicine.com/medline/citation/25917258/Salts_affect_the_interaction_of_ZnO_or_CuO_nanoparticles_with_wheat_ L2 - https://doi.org/10.1002/etc.3037 DB - PRIME DP - Unbound Medicine ER -