Summary
This laboratory study investigated how two microplastic types—conventional low-density polyethylene (LDPE) and biodegradable polymers (PBAT/PLA blend)—alter the bacterial communities in the rhizosphere of Phaseolus vulgaris at soil concentrations of 0.5–2.5% (w/w). Both microplastic types increased bacterial diversity at lower doses but showed selective effects at the highest dose (2.5%), with shifts in dominant bacterial families including elevated Comamonadaceae across treatments. The findings suggest microplastics may have consequential effects on rhizosphere function and nutrient cycling in agricultural soils.
Regional applicability
The study was conducted in the Netherlands and employed controlled laboratory conditions, making direct transfer to United Kingdom field conditions uncertain. However, as microplastic soil contamination is a widespread European concern linked to compost, biosolids, and atmospheric deposition, the findings are relevant to UK agricultural soil health and may inform future monitoring or risk assessment protocols for microplastic impacts on crop-associated microbiota.
Key measures
α-diversity indices (Chao 1, ACE, Shannon, Simpson), β-diversity, relative abundance at family level, LefSe (Linear discriminant analysis effect size) results identifying differential taxa
Outcomes reported
The study measured changes in rhizosphere bacterial community composition and diversity in response to two types of microplastics (LDPE and biodegradable) at varying soil concentrations. It assessed alpha and beta diversity indices, relative abundance of bacterial families, and identified differentially abundant taxa using LefSe analysis.
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