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Antagonistic effect of polystyrene nanoplastics on cadmium toxicity to maize (Zea mays L.)

文献类型： 外文期刊

作者： Wang, Luya 1 ; Lin, Bigui 2 ; Wu, Lin 2 ; Pan, Pan 2 ; Liu, Beibei 2 ; Li, Ruilong 3 ;

作者机构： 1.Hainan Univ, Coll Ecol & Environm, Haikou 570228, Hainan, Peoples R China

2.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Key Lab Low Carbon Green Agr Trop Reg China, Minist Agr & Rural Affairs,Hainan Danzhou Trop Ag, Danzhou 571737, Peoples R China

3.Guangxi Univ, Sch Marine Sci, Nanning 530004, Peoples R China

4.Hainan Key Lab Trop Ecocirculing Agr, Haikou 571101, Hainan, Peoples R China

5.4 Xueyuan Rd, Haikou 571101, Hainan, Peoples R China

关键词： Polystyrene nanoplastics (PSNPs); Cadmium; Maize (Zea mays L.); Antagonistic effect; Physiological indices

期刊名称：CHEMOSPHERE （ 影响因子：8.943； 五年影响因子：8.52 ）

ISSN： 0045-6535

年卷期： 2022 年 307 卷

页码：

收录情况： SCI

摘要： Nanoplastics (NPs) (<1 mu m) have gradually attracted worldwide attention owing to their widespread occurrence, distribution, and ecosystem risks. Few studies have explored the interaction between NPs and heavy metals in crops. In this study, we investigated the influence of polystyrene nanoplastics (PSNPs; 10 mg/L and 100 mg/L) and cadmium (2 mg/L and 10 mg/L) on the physiological and biochemical indices of maize plants, grown in Hoagland solution with contaminants, for 14 days. The fresh weight and growth of the maize plants were significantly reduced after exposure to high concentrations of PSNPs and Cd (p < 0.05). Specifically, the fresh weight decreased by 30.3% and 32.5% in the PSNPs and Cd treatment, respectively. Root length and shoot length decreased by 11.7% and 20.0%, and by 16.3% and 27.8%, in the PSNPs and Cd treatment, respectively. However, there were no significant effects on the fresh weight and growth of maize plants as Cd levels increased from 2 to 10 mg/L in the presence of PSNPs. Polystyrene nanoplastics alleviated the phytotoxicity of Cd in maize. Scanning electron microscopy (SEM) showed that PSNPs and Cd could enter maize roots and were transported upwards to the leaves through the vascular bundle. The activities of peroxidase (POD) and catalase (CAT) in maize leaves increased significantly under high concentrations of PSNPs, whereas superoxide dismutase (SOD) activity decreased (p < 0.05). The differences in SOD activity may be related to the absence of microelements such as Zn, Fe, and Mn. This study provides a scientific basis for further exploration of the combined toxicological effects of heavy metals and NPs on the environment.

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