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Soil fauna Protaetia brevitarsis mediated polyethylene microplastic biodegradation
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Researchers found that larvae of the beetle Protaetia brevitarsis can biodegrade polyethylene microplastics in soil, with gut microbiome analysis revealing specific bacterial communities responsible for PE degradation, suggesting potential for insect-mediated plastic bioremediation.
Polyethylene (PE) microplastics (MPs), derived primarily from agricultural mulch films and other plastic debris, remain significant soil contaminants due to their resistance to degradation. This study reveals that soil-dwelling grubs (Protaetia brevitarsis larvae) possess a unique ability to degrade PE MPs with ultrahigh molecular weight (> 600 kDa) through synergistic interactions with gut microbes. Over a 28-day experimental period, the larvae consumed an average of 62.96 mg PE per grub daily, resulting in 28.6 % mass reduction of ingested PE-MPs. Molecular analyses of frass-residue MPs showed a 52.9 % decrease in weight-average molecular weight and oxidative functionalization (hydroxyl/carbonyl formation), while thermal profiles revealed biodegradation-specific byproducts, confirming extensive depolymerization. Antibiotic suppression delineated gut microbial contributions to PE-MPs degradation. Concurrently, gut microbiota restructured into Enterococcaceae-dominated consortia specialized in breaking down the polymers. Unlike previously studied surface-dwelling insects, P. brevitarsis naturally inhabits agricultural soil strata where plastic mulch residues accumulate, enabling in situ remediation without nutritional supplementation while maintaining physiological resilience through sustained survival rate and growth. Overall, we demonstrate PE-MP biodegradation by P. brevitarsis for the first time, illustrating the degradation mechanism mediated by both the host and gut microbiota. These results highlight P. brevitarsis as natural bioremediators for agricultural PE-MP pollution, presenting a sustainable approach to mitigate persistent microplastics with minimal ecological risks.
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This review examined how insects and their gut microbiota contribute to microplastic biodegradation, summarizing known degradation mechanisms and the microorganisms involved. The authors found that several insect species harbor gut bacteria capable of depolymerizing common plastics like polystyrene and polyethylene, though degradation rates remain too slow for practical remediation at scale.
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Researchers discovered that black soldier fly larvae can biodegrade microplastics and phthalate plasticizers, with their gut microorganisms playing a key role in the breakdown process. The study found that the larvae's digestive bacteria enhanced the degradation of both contaminants, suggesting that insect-based bioprocessing could offer a novel approach to addressing plastic pollution.
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