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Insights into the accumulation, distribution and toxicity of pyrene associated with microplastics in rice (Oryza sativa L.) seedlings

文献类型： 外文期刊

作者： Tian, Lili 1 ; Ma, Li Ya 1 ; Chen, Xiaolong 1 ; Ge, Jing 1 ; Ma, Yini 3 ; Ji, Rong 4 ; Yu, Xiangyang 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Food Safety & Nutr, Zhongling St 50, Nanjing 210014, Peoples R China

2.Minist Sci & Technol, Jiangsu Key Lab Food Qual & Safety, State Key Lab Cultivat Base, Zhongling St 50, Nanjing 210014, Peoples R China

3.Hainan Univ, Coll Ecol & Environm, Renmin Ave 58, Haikou 570028, Peoples R China

4.Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Xianlin Ave 163, Nanjing 210023, Peoples R China

关键词： Polyethylene; PAHs; Uptake; Translocation; Subcellular distribution

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： 2023 年 311 卷

页码：

收录情况： SCI

摘要： Microplastic and polycyclic aromatic hydrocarbons (PAHs) can be introduced into agroecosystems through various agricultural activities and may threaten food safety and human health. However, little research has focused on the behavior of microplastics-associated PAHs and their toxicity effects in agroecosystems, especially in crops. In the present study, we investigated the accumulation, distribution and toxicity of pyrene associated with polyethylene (PE) microplastics in rice (Oryza sativa L.). With quantitative analysis using 14C isotope labelling, the total accumulation efficiency of 14C-pyrene in rice seedlings was 22.4 +/- 1.2% and 14.5 +/- 0.3% when exposed to freely dissolved pyrene and PE-associated pyrene, respectively. The translocation of 14C-pyrene was significantly decreased by microplastics adsorption even when the amount of pyrene in the rice roots had no significant difference. Subcellular distribution of 14C-pyrene in rice suggested that PE microplastics-associated pyrene located more on cell walls than free dissolved pyrene. Furthermore, results showed free pyrene, but not PE-associated pyrene, significantly decreased the length and biomass of rice roots as well as increased the activities of antioxidant enzymes (superoxide dismutase and catalase). It indicated that the association with microplastics alleviated the phytotoxicity of pyrene in rice seedlings. These findings shed new light on the environmental behavior and effects of PAHs associated with microplastics in crops and will be helpful to its comprehensive risks assessment.

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