Nanoparticles properties such as solubility, tunable surface charges, and singular reactivity might be explored to improve the performance of fertilizers. Nevertheless, these unique properties may also bring risks to the environment since the fate of nanoparticles is poorly understood. This study investigated the impact of a range of CuO nanoparticles sizes and concentrations on the germination and seedling development of Phaseolus vulgaris L. Nanoparticles did not affect seed germination, but seedling weight gain was promoted by 100 mg Cu L and inhibited by 1 000 mg Cu L of 25 nm CuO and CuSO. Most of the Cu taken up remained in the seed coat with Cu hotspots in the hilum. X-ray absorption spectroscopy unraveled that most of the Cu remained in its pristine form. The higher surface reactivity of the 25 nm CuO nanoparticles might be responsible for its deleterious effects. The present study therefore highlights the importance of the nanoparticle structure for its physiological impacts.
Primeiramente gostaria de agradecer ao Professor Hudson Wallace Pereira de Carvalho, pela oportunidade de elaborar e realizar esse projeto, por todo o apoio, paciência e orientação ao longo dos 2 anos em que estive no laboratório de Instrumentação Nuclear (LIN) realizando este projeto. Ao especialista de laboratório, Dr. Eduardo de Almeida, por todo seu conhecimento e paciência, e por auxiliar em todos os momentos. Agradeço ao Centro de Energia Nuclear na Agricultura (CENA) e todos os funcionários da instituição e à Universidade de São Paulo (USP) por toda infraestrutura e auxílio que possibilitaram a realização do trabalho. À FAPESP (Projeto número 2018/02462-5) e a CAPES pelas bolsas de estudo e apoio financeiro durante o projeto.
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