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Dry–wet cycle changes the influence of microplastics (MPs) on the antioxidant activity of lettuce and the rhizospheric bacterial community

  • Soils, Sec 5 • Soil and Landscape Ecology • Research Article
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Abstract

Purpose

The increasing soil microplastics (MPs) pollution and the dry–wet alternation caused by climate change occur widely. Emerging studies have shown their negative impacts on the structure of soil bacteria and plant physiology. However, there is limited research on the effects of MPs exposure under different water regimes, and the influence processes are inconclusive. Therefore, the impacts of MPs under different water regimes on the antioxidant activity of vegetable and the soil bacterial community were studied.

Materials and methods

A continuous water supply and a dry–wet cycle were established to compare the effects of two types of MPs (polypropylene (PP); polyethylene terephthalate (PET)) on lettuce (Lactuca sativa L. var. longifolia) growth and soil bacterial community, determined by antioxidant enzyme activity analysis, and by high-throughput sequencing analysis, respectively.

Results

The PET influenced the lettuce growth and bacterial diversity largely compared to PP. The dry–wet cycle enhanced the effects of MPs on the activity of the antioxidant enzymes in lettuce, while it reduced lettuce biomass and root activity. Proteobacteria and Actinobacteria were the dominant soil bacteria under all treatments. The addition of MPs increased the relative abundance of nutrient-related bacteria such as Proteobacteria. MPs addition increased intragroup differences in soil bacterial diversity, and the dry–wet cycle reduced intergroup differences caused by MPs.

Conclusion

The polymer type of MPs influenced the antioxidant activity of lettuce roots and leaves. The dry–wet cycle intensified the exposure risk of MPs by enhancing the stimulation of MPs on the antioxidant activity of lettuce. The dry–wet cycle significantly reduced the MPs-induced differences in bacterial communities. In short, the dry–wet cycle might alter the ecological risks in plant-soil ecosystem by shifting soil bacterial lineages related to nutrient cycling and metabolic function under MPs exposure.

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 All data will be made available upon request.

References

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Funding

This research was funded by the National Special Fund Project for Soil Pollution Prevention and Control, and the Core Area (Demonstration Base) Construction Project for the Safe Use of Contaminated Farmland in Xinyi City.

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Authors and Affiliations

Authors

Contributions

Methodology, experimental design, data curation, writing—original draft: Tingting Zhang; conceptualization; writing—review and editing; supervision: Xiao-San Luo; investigation: Xuewen Yao and Jiayi Fan; methodology: Yijia Song and Yidan Mao; writing—review and editing: Jiangbing Xu, Wajid Ali Khattak, Jinshan Yang, and Junyu Pan. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Xiao-San Luo.

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Competing interests

The authors declare no competing interests.

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Responsible editor: Hang-Wei Hu

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Supplementary Information

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There are 2 figures (Fig. S1-S2) in the Supporting Information (DOCX 179 KB)

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Zhang, T., Luo, XS., Xu, J. et al. Dry–wet cycle changes the influence of microplastics (MPs) on the antioxidant activity of lettuce and the rhizospheric bacterial community. J Soils Sediments 23, 2189–2201 (2023). https://doi.org/10.1007/s11368-023-03479-x

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  • DOI: https://doi.org/10.1007/s11368-023-03479-x

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