With the widespread use of plastic products a large amount of microplastics (MPs) have entered soil ecosystems, leading to a continuous decline in soil environmental quality. MPs in the soil can adhere to the surfaces of plant roots, hindering nutrient absorption and disrupting physiological metabolism. Furthermore, MPs can affect water and nutrient cycles in the soil, alter soil microbial communities, and indirectly increase stress on plant growth.
Due to the complexity of soil ecosystems, mitigating the harmful effects of MPs pollution on plants remains challenging. Recently, a Chinese research team published findings in Environmental Chemistry and Ecotoxicology , revealing the role of earthworms in alleviating the negative impact of microplastics on plants. The team found that earthworms can reduce the adverse effects of microplastics on plant growth by promoting soil nutrient and organic matter cycling, improving microbial communities, and regulating plant gene expression.
Hailong Wang, who led the study, pointed out that earthworms also promote an increase in the relative abundance of microbial communities involved in nitrogen, phosphorus, and carbon cycling in soils contaminated with MPs, which is beneficial for promoting the nutrient cycling processes of nitrogen, phosphorus, and organic matter in the soil. “
“Our research further reveals that earthworms can alleviate the adverse effects of MPs on plant growth by regulating gene expression in plants,” says Wang.“In MPs contaminated soils, the addition of earthworms upregulates genes related to ribosomal protein synthesis in the roots of Astragalus sinicus L, improving the efficiency of protein synthesis and supporting cell development and repair.”
At the same time, earthworms also promote the expression of genes related to nutrient accumulation and energy metabolism in Astragalus sinicus L, enhancing the plant's resistance to environmental stress. “We hope that the results of this study can be applied in future ecological restoration efforts and provide a scientific basis and solutions for mitigating the adverse effects of microplastic pollution on plant growth,” adds Wang.
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Contact the author: Yanru Cao, Resource and Environmental Biology, College of Agriculture and Life Sciences & School of Medicine,Kunming University, Kunming, China, yanrucao3@aliyun.com
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Environmental Chemistry and Ecotoxicology
Experimental study
Not applicable
Modulation of soil microenvironment and plant gene expression by earthworms reduces polypropylene microplastic-induced growth stress in Chinese milk vetch (Astragalus sinicus L.)
The authors declare that they do not have the competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.