Differential responses of maize (Zea mays) at the physiological, biomolecular, and nutrient levels when cultivated in the presence of nano or bulk ZnO or CuO or Zn2+ or Cu2+ ions

JOURNAL OF HAZARDOUS MATERIALS

卷:419

Article

Ahmed, Bilal¹  Rizvi, Asfa^3,4  Syed, Asad²  Elgorban, Abdallah M.²  AL-Shwaiman, Hind A.²  Musarrat, Javed³  Lee, Jintae¹ 

[1] Yeungnam Univ, Sch Chem Engn, Gyongsan, South Korea

[2] King Saud Univ, Coll Sci, Dept Bot & Microbiol, POB 2455, Riyadh 11451, Saudi Arabia

[3] Aligarh Muslim Univ, Fac Agr Sci, Dept Agr Microbiol, Aligarh 202002, Uttar Pradesh, India

[4] Jamia Hamdard, Dept Bot, New Delhi 110062, India

关键词: Deeper penetration;    Ultrastructure;    Growth Media;    Bioaccumulation;    Toxicity;   

DOI  :  10.1016/j.jhazmat.2021.126493

来源: Elsevier

【 摘 要 】

Expanding applications of metal-based nanoparticles (NPs) in industry and agriculture have influenced agro-ecosystems. However, relatively little is known about the bioaccumulation, distribution, and phytotoxicity of ZnO-NPs, CuO-NPs, ZnO-bulk, CuO-bulk, Zn2+, or Cu2+ in maize. Plants were exposed to 0.05-2 mg ml(-1) or g(-1) of six tested materials in agar (7 days) in hydroponic medium (20 days), or sandy-clay-loam soil (20 or 40 days). Seed germination, emergence and lengths of plumules, principal and seminal roots were significantly inhibited by ZnO-NPs, CuO-NPs, Zn2+, and Cu2+. Toxicity was more pronounced in hydroponic culture than in soil, and perceptible alterations in biomolecules were evident. ICP-MS analysis exhibited progressive uptake of metals while morphological, elemental, and surface/deeper scanning showed translocation and distribution of NPs in tissues. Tested materials induced enhanced superoxide radical production, lipid peroxidation, and antioxidant enzymes and praline levels. Exposure significantly reduced P-accumulation, photosynthesis, and protein production. Zn2+ and Cu2+ were found to be more toxic than NPs. Compared to 20 days exposure in soil, toxicity slightly increased after 40 days. ZnO-NPs and CuO-NPs increased apoptotic sub-G1 population by 22.4% and 38%, respectively. These results provide a better understanding of the mechanistic aspects responsible for the nanotoxicities of ZnO- and CuO-NPs in maize.

【 授权许可】

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