Abstract
Copper oxide nanoparticles (CuO NPs) are widely used as a fungicide in agriculture. The application of CuO NPs in agriculture affects the growth of rice and metal accumulation in rice. However, the mechanism of CuO NPs on arsenic (As) accumulation in rice remains unclear. In this study, a hydroponic culture was produced to investigate the mechanism of the effect of 50 and 100 mg L−1 CuO NPs on As accumulation in rice. Our results showed that CuO NPs decreased As(III/V) accumulation in the roots and shoots by adsorbing As(III/V), oxidizing of As(III) on the surface, and thickening the root cell wall. The addition of CuO NPs regulated the expression of the OsNIP1;1, OsHAC1;1, and OsHAC4 genes, which decreased As(III) transport and promoted As(V) reduction in the roots. Moreover, when CuO NPs were co-exposed to As, a negative correlation between the concentration of Cu and As in rice was also found in our study. However, CuO NPs significantly increased Cu accumulation in rice and constrained the rice growth. In conclusion, CuO NPs might be a promising way to decrease As accumulation in rice, but the negative effects such as growth inhibition should be further considered. Therefore, the application of CuO NPs in rice plants should take a more restrained approach.
Highlights
Nanomaterials refer to the materials composed of 1 to 100 nanometer scale materials.Nanoparticles are characterized by a small volume, large surface area, excellent chemical reaction performance, and stronger oxidation ability
Our results showed that As(III/V) was adsorbed on the surface of CuO NPs
Our results showed that As(III/V) was adsorbed on the surface of CuO NPs, and part of As(III) was oxidized to As(V) (Figure 1)
Summary
Nanomaterials refer to the materials composed of 1 to 100 nanometer scale materials. Nanoparticles are characterized by a small volume, large surface area, excellent chemical reaction performance, and stronger oxidation ability. Nanomaterials are used in many fields because of the remarkable enhancement of optics, mechanics, electricity, structure, and magnetism of nanomaterials [1]. Copper oxide nanoparticles (CuO NPs) are widely used as a fungicide in agriculture because of their destructive effect on bacteria and fungi at both the cellular level and the molecular level [2,3]. CuO NPs are used as a plant growth promoter in agriculture when soil is infected by pathogenic bacteria [4,5]. CuO NPs increase the uptake of nutrient elements by plants [6]
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