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Sustainability 2017, 9(5), 790;

Magnetic (Fe3O4) Nanoparticles Reduce Heavy Metals Uptake and Mitigate Their Toxicity in Wheat Seedling

College of Resources and Environmental Sciences, China Agricultural University, Beijing 100093, China
Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
Institute Superior of Agronomy and Veterinary of Faranah (ISAV/F), Faranah 131, Republic of Guinea
Key Laboratory of Animal Nutrition, Department of Animal Nutrition and Feed Sciences, China Agricultural University, Beijing 100093, China
Author to whom correspondence should be addressed.
Academic Editors: Elena Cristina Rada and Lucian-Ionel Cioca
Received: 25 March 2017 / Revised: 27 April 2017 / Accepted: 3 May 2017 / Published: 10 May 2017
(This article belongs to the Collection Risk Assessment and Management)
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Heavy metal pollution is not only a hazard to living organisms but also an important worldwide environmental concern. Experiments were performed to investigate the physiological mechanisms of magnetic (Fe3O4) nanoparticles (nano-Fe3O4) mitigation of the toxicity of heavy metals (Pb, Zn, Cd and Cu) in wheat seedlings. All the Petri dishes with germinating seedlings (1d) were covered, sealed with parafilm, and placed in a dark growth chamber. All parameters (seedling growth inhibition, heavy metal accumulation, enzymatic activities, and reducing effects of nano-Fe3O4 on heavy metal toxicity) were analyzed only after five days. The results showed that the tested heavy metals significantly affected the growth of wheat seedling by decreasing root length, shoot length and even death at 10 mM concentration in the case of Cd and Cu. Heavy metals exposure also showed that superoxide dismutase (SOD) and peroxidases (POD) activities decreased significantly when the malondialdehyde (MDA) content was significantly higher in wheat seedlings. Addition of magnetic (Fe3O4) nanoparticles (2000 mg/L) in each heavy metal solution (1 mM) significantly decreased the growth inhibition and activated protective mechanisms to reduce oxidative stress induced by heavy metals in the wheat seedlings. The reducing effects of nano-Fe3O4 against heavy metals stress could be dependent on the increase in the enzyme activity (SOD and POD). Their protective role was confirmed by the decrease in MDA content. The alleviating effect of nano-Fe3O4 is associated with their adsorption capacity of heavy metals. View Full-Text
Keywords: alleviation; heavy metals; magnetic (Fe3O4) nanoparticles; inhibition; oxidative stress; wheat alleviation; heavy metals; magnetic (Fe3O4) nanoparticles; inhibition; oxidative stress; wheat

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Konate, A.; He, X.; Zhang, Z.; Ma, Y.; Zhang, P.; Alugongo, G.M.; Rui, Y. Magnetic (Fe3O4) Nanoparticles Reduce Heavy Metals Uptake and Mitigate Their Toxicity in Wheat Seedling. Sustainability 2017, 9, 790.

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