Studies on the impact of aged microplastics on agricultural soil enzyme activity, lettuce growth, and oxidative stress
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View abstract on PubMed
Summary
This summary is machine-generated.Microplastics (MPs) significantly impact soil and plant health. High concentrations of polylactic acid (PLA) MPs altered soil enzymes and reduced lettuce growth, while all MPs induced oxidative stress in plants.
Area Of Science
- Environmental Science
- Soil Science
- Plant Physiology
Background
- Microplastics (MPs) are a growing global pollutant, affecting soil ecosystems and plant development.
- Understanding the impact of different MP types and concentrations on soil-plant systems is crucial for ecological risk assessment.
Purpose Of The Study
- To investigate the effects of aged polystyrene (PS), polyethylene, and polylactic acid (PLA) MPs on soil properties, enzyme activities, lettuce growth, and oxidative stress.
- To determine the dose-dependent responses of soil-plant systems to varying MP concentrations (0.1%–10%).
Main Methods
- A pot experiment was conducted using three types of aged MPs (PS, polyethylene, PLA) at four concentrations.
- Evaluated soil physicochemical properties, urease activity, lettuce growth parameters (fresh weight), and oxidative stress biomarkers (CAT, SOD) in plant tissues.
- Utilized Integrated Biomarker Response (IBR) analysis to assess overall oxidative stress.
Main Results
- High concentrations of PLA MPs increased soil urease activity, while PS MPs decreased it.
- PLA MPs at high concentrations (5%, 10%) significantly reduced lettuce fresh weight and root biomass.
- All MP types increased soluble sugar content in lettuce leaves and induced oxidative stress, evidenced by enhanced CAT and SOD activities, though high PLA concentrations suppressed these enzymes in roots.
Conclusions
- Microplastics, particularly PLA at high concentrations, significantly disrupt soil enzyme activity and plant growth, inducing oxidative stress in lettuce.
- The study provides essential data for evaluating the ecological risks of microplastic pollution in agricultural soils and its effects on crop plants.
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