Bioaccumulation and phytotoxicity of ZnO nanoparticles in soil-grown Brassica chinensis L. and potential risks. (15th March 2022)

• Record Type: Journal Article
• Authors: Shen, Meimei; Liu, Weitao; Zeb, Aurang; Lian, Jiapan; Wu, Jiani; Lin, Maohong
• Is Part Of: Journal of environmental management. Volume 306(2022)
• Publication Date: 2022-03-15
• Subjects: ZnO nanoparticles -- Pakchoi -- Accumulation -- Oxidative response -- Health risk; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2022.114454
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Zinc oxide nanoparticles (ZnO NPs) widely used have caught the attention of researchers, nevertheless, phytotoxicity, bioaccumulation, and potential risks thereof to the green leafy still have knowledge defects. A pot experiment was intended to cultivate pakchoi ( Brassica chinensis L.) following root exposure to ZnO NPs and Zn 2+ . ZnO NPs promoted plant growth and Zn accumulation, formed a dose-dependent effect on chlorophyll and carotenoids, and induced fluctuations in antioxidant enzyme activities and alleviated the oxidative damage of pakchoi. Particularly, 1000 mg kg −1 ZnO NPs resulted in malondialdehyde (MDA) content of pakchoi shoots that was 87% higher than control. TEM was used to observe ZnO NPs of root cells and found that its possible way to enter the plant was endocytosis. Research on the content of several co-existing nutrients showed that 100 mg kg −1 ZnO NPs significantly ( p < 0.05) promoted the absorption of Ca, P and Fe by pakchoi shoots. In parallel, the hazard quotient (HQ) was used to assess the potential health risk of ZnO NPs. Graphical abstract: Image 1 Highlights: Pakchoi exposed to ZnO NPs was promoted higher fresh biomass and Zn accumulation. The vesicles in root cells implied ZnO NPs may enter the cell through endocytosis. High ZnO NPs exposure induced oxidative stress in pakchoi leaves. High ZnO NPs exposure level (1000 mg kg −1 ) poses a potential health risk to human.