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Physiological and Molecular Response of Arabidopsis thaliana to CuO Nanoparticle (nCuO) Exposure

作者：Mingjing Ke¹, Youchao Zhu¹, Meng Zhang¹, Hailiqieguli Gumai¹, Zhenyan Zhang¹, Junjie Xu¹, Haifeng Qian^1,2

    1.College of EnvironmentZhejiang University of TechnologyHangzhouPeople’s Republic of China

    2.Xinjiang Key Laboratory of Environmental Pollution and BioremediationChinese Academy of SciencesUrumqiPeople’s Republic of China

摘要：The widespread application of copper oxide nanoparticles (nCuO) results in ecological risk when nanoparticles enter the environment. This study clarifies the mechanism of nCuO toxicity in Arabidopsis thaliana seedlings via comparison with copper (Cu) ion bioeffects. Under the same culture conditions, Cu2+ ion exposure exerted a stronger inhibitory effect on plant fresh weight and growth and caused stronger oxidative disruption (measured by malondialdehyde, MDA) than nCuO exposure. The Cu2+ ions also showed a stronger induction effect than did nCuO on the activity of antioxidant enzymes and the transcription of antioxidant-related genes. Dissolved Cu2+ ions contributed a minority of the toxicity of nCuO, implying that nCuO itself showed relative strong phytotoxicity. The work presented here will help increase our understanding of the toxicity of metal nanoparticles in plants.