Abstract
Microplastics (MPs) and copper (Cu) pollution coexist widely in cultivation environment. In this paper, polyvinyl chloride (PVC) were used to simulate the MPs exposure environment, and the combined effects of MPs + Cu on the germination of perilla seeds were analyzed. The results showed that low concentrations of Cu promoted seed germination, while medium to high concentrations exhibited inhibition and deteriorated the morphology of germinated seeds. The germination potential, germination index and vitality index of 8 mg • L−1 Cu treatment group with were 23.08%, 76.32% and 65.65%, respectively, of the control group. The addition of low concentration PVC increased the above indicators by 1.27, 1.15, and 1.35 times, respectively, while high concentration addition led to a decrease of 65.38%, 82.5%, and 66.44%, respectively. The addition of low concentration PVC reduced the amount of PVC attached to radicle. There was no significant change in germination rate. PVC treatment alone had no significant effect on germination. MPs + Cu inhibited seed germination, which was mainly reflected in the deterioration of seed morphology. Cu significantly enhanced antioxidant enzyme activity, increased reactive oxygen species (ROS) and MDA content. The addition of low concentration PVC enhanced SOD activity, reduced MDA and H2O2 content. The SOD activity of the Cu2+8 + PVC10 group was 4.05 and 1.35 times higher than that of the control group and Cu treatment group at their peak, respectively. At this time, the CAT activity of the Cu2+8 + PVC5000 group increased by 2.66 and 1.42 times, and the H2O2 content was 2.02 times higher than the control. Most of the above indicators reached their peak at 24 h. The activity of α-amylase was inhibited by different treatments, but β-amylase activity, starch and soluble sugar content did not change regularly. The research results can provide new ideas for evaluating the impact of MPs + Cu combined pollution on perilla and its potential ecological risk.
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This work was supported by the MinJiang Scholar fund from Fujian Province and Fujian Agriculture and Forestry University (FAFU) (116-114120019); Training Program of innovation and entrepreneurship for undergraduate in FAFU (X202310389211), China.
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JHWu, FHS, and ZZZ designed and performed the experiments, analyzed the data and wrote the manuscript. TJF, YXX, and XLZ analyzed the data and contributed reagents and materials. GWP polished the language of manuscript. ZZZ and JHW provided financial support and revised the manuscript.
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Sun, F., Feng, T., Xu, Y. et al. Combined effects of micron-sized polyvinyl chloride particles and copper on seed germination of perilla. Environ Geochem Health 46, 193 (2024). https://doi.org/10.1007/s10653-024-01976-7
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DOI: https://doi.org/10.1007/s10653-024-01976-7