Interaction mechanisms between α-Fe2 O3 , γ-Fe2 O3 and Fe3 O4 nanoparticles and Citrus maxima seedlings

The Science of the Total Environment
Junli LiXilong Wang

Abstract

The interactions between α-Fe2O3, γ-Fe2O3, and Fe3O4 nanoparticles (NPs) and Citrus maxima seedlings were examined so as to better understand possible particle applications as an Fe source for crop plants. NPs toxicity to the exposed plant was investigated as well. The α- and γ-Fe2O3 NPs were accumulated by plant root cells through diapirism and endocytosis, respectively, but translocation to the shoots was negligible. Analysis of malondialdehyde (MDA), soluble protein content, and antioxidant enzyme activity revealed that Fe deficiency induced strong oxidative stress in Citrus maxima seedlings, which followed an order of Fe deficiency>Fe3+>α-Fe2O3, γ-Fe2O3 NPs>Fe3O4 NPs. However, the chlorophyll leaf content of plants exposed to α-Fe2O3, γ-Fe2O3, Fe3O4 NPs and Fe3+ were significantly reduced by 31.1%, 14.8%, 18.8% and 22.0%, respectively, relative to the control. Furthermore, RT-PCR analysis revealed no up-regulation of AHA and Nramp3 genes in Citrus maxima roots; however, the relative FRO2 gene expression upon exposure to iron oxide NPs was 1.4-2.8-fold higher than the control. Ferric reductase activity was consistently enhanced upon iron oxide NPs exposure. These findings advance understanding of the interaction mechanisms b...Continue Reading

Citations

Jan 22, 2021·Ecotoxicology and Environmental Safety·María Florencia IannoneMaría Patricia Benavides
Feb 7, 2021·Materials Science & Engineering. C, Materials for Biological Applications·Ruijiang LiuRongzhu Lu
Jun 1, 2021·ACS Omega·Zhihao LiangShiwei Song
Nov 26, 2021·Applied Biochemistry and Biotechnology·Yanjun OuYu Xiao

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