Soil fungi switch strategies when plastic pollution meets arsenic
Liu S, Jing X, Wang Y, He M, Chen X
Mycorrhizal Networks
The soil under your vegetable beds hosts fungal partners that quietly buffer contamination, and knowing they can adapt their strategy when microplastics show up means healthy soil is more resilient to modern pollution than we assumed.
Arbuscular mycorrhizal fungi are tiny partners that live on plant roots and help plants deal with toxic stuff like arsenic in the soil. Scientists found that when nanoplastics are also present, these fungi stop trying to boost the number of different microbe species and instead focus on making the existing microbial community steadier and more stable. It's a smart pivot: the fungi essentially trade variety for reliability, keeping the soil working well even under double pollution stress.
Key Findings
AMF inoculation increased microbial community diversity under nanoplastic or arsenic stress alone, but under combined nanoplastic-arsenic contamination it instead restructured the community by enriching Proteobacteria and Bdellovibrionota.
Under co-contamination, AMF simplified the microbial co-occurrence network, reducing nodes, edges, and average degree, while decreasing vulnerability and average variation degree and increasing niche width.
Partial least squares path modeling confirmed that AMF-mediated microbial community changes directly drove enhanced compositional stability and soil ecosystem multifunctionality.
chevron_right Technical Summary
Tiny plastic particles in soil change how helpful fungi protect plants from arsenic contamination: instead of boosting the variety of soil microbes, the fungi shift to stabilizing the microbial community's makeup, keeping the soil ecosystem functional even when pollution levels rise.
Abstract Preview
Original paper
Nanoplastics shift arbuscular mycorrhizal fungal mediation of bacterial community assembly from diversity to compositional stability under arsenic stress.
Arbuscular mycorrhizal fungi (AMF) play a vital role in contaminated soil remediation, yet how NPs regulate AMF mediated arsenic (As) remediation under NP and As co-contamination remains unclear. T...
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