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Acta Biologica Hungarica

, Volume 67, Issue 3, pp 286–296 | Cite as

Determination of Zinc Oxide Nanoparticles Toxicity in Root Growth in Wheat (Triticum Aestivum L.) Seedlings

  • Meppaloor G. Prakash
  • Ill Min ChungEmail author
Article

Abstract

The effect of zinc oxide nanoparticles (ZnONPs) was studied in wheat (Triticum aestivum L.) seedlings under in vitro exposure conditions. To avoid precipitation of nanoparticles, the seedlings were grown in half strength semisolid Murashige and Skoog medium containing 0, 50, 100, 200, 400 and 500 mg L–1 of ZnONPs. Analysis of zinc (Zn) content showed signifcant increase in roots. In vivo detection using fuorescent probe Zynpyr-1 indicated accumulation of Zn in primary and lateral root tips. All concentrations of ZnONPs signifcantly reduced root growth. However, signifcant decrease in shoot growth was observed only after exposure to 400 and 500 mg L–1 of ZnONPs. The reactive oxygen species and lipid peroxidation levels signifcantly increased in roots. Signifcant increase in cell-wall bound peroxidase activity was observed after exposure to 500 mg L–1 of ZnONPs. Histochemical staining with phloroglucinol-HCl showed lignifcation of root cells upon exposure to 500 mg L–1 of ZnONPs. Treatment with propidium iodide indicated loss of cell viability in root tips of wheat seedlings. These results suggest that redox imbalances, lignifcation and cell death has resulted in reduction of root growth in wheat seedlings exposed to ZnONPs nanoparticles.

Keywords

Triticum aestivum zinc oxide nanoparticles root growth reactive oxygen species lignin 

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© Akadémiai Kiadó, Budapest 2016

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  1. 1.Department of Applied Biosciences, School of Life and Environmental SciencesKonkuk UniversitySeoulSouth Korea

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