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| Toxicity of polystyrene microplastics on seeds and seedlings of Brassica campestris L. |
| Received:December 22, 2020 |
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| KeyWord:polystyrene;microplastics;Brassica campestris L.;seed germination;toxic effect |
| Author Name | Affiliation | E-mail | | HUANG Xian-pei | College of Life Science and Technology, Jinan University, Guangzhou 510632, China
Shanwei Marine Industry Institute, Shanwei 516600, China | | | XIANG Lei | College of Life Science and Technology, Jinan University, Guangzhou 510632, China | | | GUO Jing-jie | College of Life Science and Technology, Jinan University, Guangzhou 510632, China | | | PAN Yi-feng | Shanwei Marine Industry Institute, Shanwei 516600, China | | | CHEN Yi-ping | Shanwei Marine Industry Institute, Shanwei 516600, China | | | LI Yan-wen | College of Life Science and Technology, Jinan University, Guangzhou 510632, China | | | MO Ce-hui | College of Life Science and Technology, Jinan University, Guangzhou 510632, China | tchmo@jnu.edu.cn |
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| Abstract: |
| To explore the ecotoxic effects of microplastics on seed germination of vegetables and other crop seeds, the effects of different particle sizes(0.07, 1 μm, and 20 μm) and concentrations(125, 250, 500, 750, 1 000, 1 500 mg·L-1, and 2 000 mg·L-1) of spherical polystyrene microplastics(PS-MPs) on seed germination and seedling growth of Brassica campestris L. were investigated. The results showed that PS-MPs of all particle sizes could cause toxic effects on the germination of B. campestris L. seeds. The highest sensitivity to toxicity was observed with 0.07 μm PS-MPs, whereas the 20 μm PS-MPs had the most toxic effects. Stress resistance to PS-MPs was improved in B. campestris L. seedlings through adjusting the content of soluble protein and soluble sugar in the plant. Furthermore, the activities of superoxide dismutase and catalase were significantly inhibited by PS-MPs, particularly at high concentrations(P<0.05). These results indicate that polystyrene microspheres have significant toxicity effects based on particle size on seed germination and seedling growth of Brassica campestris L., and the mechanisms of toxicity are related to the regulation of soluble sugar and protein levels and the oxidative stress system in plants. |
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