Microbial degradation of low density polyethylene by Exiguobacterium sp. strain LM-IK2 isolated from plastic dumped soil

Maroof, Lalina; Khan, Ibrar; Hassan, Hamid; Azam, Sadiq; Khan, Waris

doi:10.1007/s11274-022-03389-z

Cited by 14 publications

(1 citation statement)

References 40 publications

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“…At present, plastic waste disposal methods include landfilling, incineration, and recycling. However, these methods are not only considered expensive, but also have harmful effects on human life [ 12 ]. Of these, bioremediation degrades toxic pollutants into non-toxic metabolites via microorganisms such as bacteria and fungi, with the end products usually being carbon dioxide and water [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Biodegradation of Low Density Polyethylene by the Fungus Cladosporium sp. Recovered from a Landfill Site

Gong

Jin

et al. 2023

JoF

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Low density polyethylene (LDPE) has been widely used commercially for decades; however, as a non-degradable material, its continuous accumulation has contributed to serious environmental issues. A fungal strain, Cladosporium sp. CPEF-6 exhibiting a significant growth advantage on MSM-LDPE (minimal salt medium), was isolated and selected for biodegradation analysis. LDPE biodegradation was analyzed by weight loss percent, change in pH during fungal growth, environmental scanning electron microscopy (ESEM), and Fourier transformed infrared spectroscopy (FTIR). Inoculation with the strain Cladosporium sp. CPEF-6 resulted in a 0.30 ± 0.06% decrease in the weight of untreated LDPE (U-LDPE). After heat treatment (T-LDPE), the weight loss of LDPE increased significantly and reached 0.43 ± 0.01% after 30 days of culture. The pH of the medium was measured during LDPE degradation to assess the environmental changes caused by enzymes and organic acids secreted by the fungus. The fungal degradation of LDPE sheets was characterized by ESEM analysis of topographical alterations, such as cracks, pits, voids, and roughness. FTIR analysis of U-LDPE and T-LDPE revealed the appearance of novel functional groups associated with hydrocarbon biodegradation as well as changes in the polymer carbon chain, confirming the depolymerization of LDPE. This is the first report demonstrating the capacity of Cladosporium sp. to degrade LDPE, with the expectation that this finding can be used to ameliorate the negative impact of plastics on the environment.

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Section: Introductionmentioning

confidence: 99%

Biodegradation of Low Density Polyethylene by the Fungus Cladosporium sp. Recovered from a Landfill Site

Gong

Jin

et al. 2023

JoF

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Effect of plastic film and hemp canvas mulching on soil properties, microbial diversity and lettuce yield

Jacquiod,

Bouchard,

Beguet

et al. 2024

Plant Soil

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Aims -Plastic lms are used to mulch soils to control weeds, especially in organic farming. Their application leaves persistent plastic fragments in soils, with poorly understood environmental and health consequences. Plant ber textiles (bio-canvas) are promising alternatives since they are more persistent than straw mulching and are entirely biodegradable. Hemp bers are particularly interesting materials due to their renowned resistance, allelopathic and trophic properties for soil life. However, their effects on soil microbiota and yield remain unclear.Methods -In a greenhouse experiment, we assessed the effect of soil mulching (bare soil control, plastic mulch, hemp straw mulching, hemp-canvas) on lettuce growth, soil climatic conditions, enzymatic activities and microbial communities (bacteria and fungi). Our experiment allowed to distinguish effects associated to mulching, being i) the homogeneity of soil covering (plastic mulch and hemp canvas) or not (control, hemp mulch), ii) the biodegradability (hemp mulch, hemp canvas) or not (control, plastic mulch), and iii) their interaction.Results -An interaction occurred between cover homogeneity and biodegradability when using the hemp canvas, leading to higher soil relative water content, stable soil temperature, higher laccase and arylamidase activities, and different soil microbial community structures and fungal diversity, with comparable lettuce yields to that obtained with plastic mulch. Plastic cover induced higher soil temperatures, lower enzymatic activities, and different soil microbial community structures.Conclusions -We conclude that hemp canvas secures lettuce yields, but through different mechanisms compared to plastic mulch, notably via a biostimulating effect on soil microbial diversity and functioning.

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Understanding the Structure and Function of Landfill Microbiome Through Genomics

Merchant,

Kahali,

Kumawat

et al. 2024

Microbial Diversity in the Genomic Era

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Microbial degradation of low density polyethylene by Exiguobacterium sp. strain LM-IK2 isolated from plastic dumped soil

Cited by 14 publications

References 40 publications

Biodegradation of Low Density Polyethylene by the Fungus Cladosporium sp. Recovered from a Landfill Site

Biodegradation of Low Density Polyethylene by the Fungus Cladosporium sp. Recovered from a Landfill Site

Effect of plastic film and hemp canvas mulching on soil properties, microbial diversity and lettuce yield

Understanding the Structure and Function of Landfill Microbiome Through Genomics

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