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Plastic-inhabiting fungi in marine environments and PCL degradation activity
Summary
Researchers collected fungi growing on plastic waste along Korean coastlines and tested their ability to break down a biodegradable plastic called polycaprolactone (PCL), finding that 87 out of 108 species identified showed some degradation ability. This suggests that ocean plastic surfaces host a diverse community of fungi that could potentially be harnessed to biologically break down plastic pollution in marine environments.
Plastic waste has a negative impact on marine ecosystems and the quantity of this source of anthropogenic pollution continues to increase. Several studies have investigated plastic biodegradation using various microorganisms. In this study, we isolated fungi from polyethylene terephthalate (PET) waste on Korean seacoasts and evaluated their ability to degrade plastic by comparing the diameters of the clear zones they formed on polycaprolactone (PCL) agar. We isolated 262 strains from 47 plastic waste sources and identified 108 fungal species via molecular methods. The PCL agar assay revealed that 87 species presented with varying degrees of PCL degradation capacity. Among them, certain fungal species were strong PCL degraders. The present study demonstrated the possibility that some fungi inhabiting plastic could potentially degrade it in the marine environment. We believe that the discoveries made herein lay theoretical and practical foundations for the development of novel bioremediation systems for marine plastispheres and help mitigate the environmental pollution issues related to plastic wastes.