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Nanomaterials 2016, 6(3), 50; doi:10.3390/nano6030050

Nanoparticles Composed of Zn and ZnO Inhibit Peronospora tabacina Spore Germination in vitro and P. tabacina Infectivity on Tobacco Leaves

1
Department of Plant and Soil Sciences, University of Kentucky, Lexington 40546, KY, USA
2
CSIRO Land and Water, Urrbrae 5064, Australia
3
CSIRO Land and Water Flagship, CSIRO, Dutton Park 4102, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Thomas Nann
Received: 27 January 2016 / Revised: 10 March 2016 / Accepted: 11 March 2016 / Published: 16 March 2016
(This article belongs to the Special Issue Engineered Nanomaterials in the Environment)
View Full-Text   |   Download PDF [2450 KB, uploaded 16 March 2016]   |  

Abstract

Manufactured nanoparticles (NPs) are increasingly being used for commercial purposes and certain NP types have been shown to have broad spectrum antibacterial activity. In contrast, their activities against fungi and fungi-like oomycetes are less studied. Here, we examined the potential of two types of commercially available Zn NPs (Zn NPs and ZnO NPs) to inhibit spore germination and infectivity on tobacco leaves resulting from exposure to the fungi-like oomycete pathogen Peronospora tabacina (P. tabacina). Both types of NPs, as well as ZnCl2 and bulk ZnO control treatments, inhibited spore germination compared to a blank control. ZnO ENMs were shown to be a much more powerful suppressor of spore germination and infectivity than bulk ZnO. ZnO and Zn NPs significantly inhibited leaf infection at 8 and 10 mg·L−1, respectively. Both types of NPs were found to provide substantially higher concentration dependent inhibition of spore germination and infectivity than could be readily explained by the presence of dissolved Zn. These results suggest that both NP types have potential for use as economic, low-dose, potentially non-persistent anti-microbial agents against the oomycete P. tabacina. View Full-Text
Keywords: nanomaterials; nanopesticides; nanotechnology; nanotoxicity; nanotoxicology nanomaterials; nanopesticides; nanotechnology; nanotoxicity; nanotoxicology
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wagner, G.; Korenkov, V.; Judy, J.D.; Bertsch, P.M. Nanoparticles Composed of Zn and ZnO Inhibit Peronospora tabacina Spore Germination in vitro and P. tabacina Infectivity on Tobacco Leaves. Nanomaterials 2016, 6, 50.

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