The increasing utilization of copper oxide nanoparticles (CuO NPs) and their release into the environment has made it imperative to elucidate their impact on the ecological system including plants. However, their potential toxic impact and mechanisms on plant growth are still unclear. The aim of this study was to investigate the effects of CuO NPs and released Cu ions on seed germination and early seedling growth, as well as physiological and biochemical parameters of Oryza sativa. The results showed that CuO NPs at high concentration significantly inhibited seed germination and early seedling growth. The toxicity of CuO NPs originated from the particulate NPs rather than the released Cu²⁺. The phytotoxicity of CuO NPs to rice seed germination and seedling growth probably induced by high Cu accumulation along with the lignification and oxidative damage. The work presented here will increase our knowledge of phytotoxicity of CuO NPs.

中文翻译：

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氧化铜纳米颗粒对水稻的发芽，幼苗早期生长和生理响应的植物毒性评估

氧化铜纳米颗粒（CuO NPs）的利用率不断提高及其向环境中的释放，必须阐明它们对包括植物在内的生态系统的影响。但是，它们潜在的毒性影响和对植物生长的机制仍不清楚。这项研究的目的是研究CuO NPs和释放的Cu离子对种子发芽和幼苗早期生长以及水稻的生理生化参数的影响。结果表明，高浓度的CuO NPs显着抑制了种子的发芽和幼苗的早期生长。CuO NPs的毒性源自颗粒NPs，而不是释放的Cu ²⁺。CuO NPs对水稻种子萌发和幼苗生长的植物毒性可能是由于高Cu积累以及木质化和氧化损伤引起的。这里介绍的工作将增加我们对CuO NPs的植物毒性的了解。