Abstract
Nanoparticles (NPs) are an increasingly common contaminant in agro-environments, and their potential effect on genetically modified (GM) crops has been largely unexplored. GM crop exposure to NPs is likely to increase as both technologies develop. To better understand the implications of nanoparticles on GM plants in agriculture, we performed a glasshouse study to quantify the uptake of Fe2O3 NPs on transgenic and non-transgenic rice plants. We measured nutrient concentrations, biomass, enzyme activity, and the concentration of two phytohormones, abscisic acid (ABA) and indole-3-acetic acid (IAA), and malondialdehyde (MDA). Root phytohormone inhibition was positively correlated with Fe2O3 NP concentrations, indicating that Fe2O3 had a significant influence on the production of these hormones. The activities of antioxidant enzymes were significantly higher as a factor of low Fe2O3 NP treatment concentration and significantly lower at high NP concentrations, but only among transgenic plants. There was also a positive correlation between the treatment concentration of Fe2O3 and iron accumulation, and the magnitude of this effect was greatest among non-transgenic plants. The differences in root phytohormone production and antioxidant enzyme activity between transgenic and non-transgenic rice plants in vivo suggests that GM crops may react to NP exposure differently than conventional crops. It is the first study of NPs that may have an impact on GM crops, and a realistic significance for food security and food safety.
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The project was supported by the Key National Natural Science Foundation of China (No. 41130526) and the National Natural Science Foundation of China (No. 41371471). The authors gratefully acknowledge technical assistance with ICP-MS and ICP-OES provided by the Key Laboratory for Biological Effects of Nanomaterials and Nanosafety of Chinese Academy of Sciences.
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Gui, X., Deng, Y., Rui, Y. et al. Response difference of transgenic and conventional rice (Oryza sativa) to nanoparticles (γFe2O3). Environ Sci Pollut Res 22, 17716–17723 (2015). https://doi.org/10.1007/s11356-015-4976-7
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DOI: https://doi.org/10.1007/s11356-015-4976-7