# Integration of Biochar into Soil Unravels Protective Mechanisms Against Plastic-Induced Stress in Lens culinaris by Modulating Physiological Traits, Antioxidant Defense, and Methylglyoxal Detoxification Systems

## TL;DR

This study shows how adding biochar to soil helps lentil plants resist stress caused by plastic pollution by boosting their antioxidant defenses.

## Contribution

The novelty is using pineapple peel biochar to mitigate plastic-induced stress in crops and reusing waste materials to combat plastic pollution.

## Key findings

- Pineapple peel biochar (PBC) improved lentil growth and reduced plastic-induced oxidative stress.
- PBC enhanced antioxidant enzyme activity and reduced methylglyoxal levels in plastic-exposed soil.
- Biochar amendment offers a cost-effective and eco-friendly solution for plastic-contaminated soil.

## Abstract

Plastics have emerged as a significant pollutant, posing a serious threat to the sustainability of the soil ecosystem and food security because of their long-term persistence, resilience, and robustness under different environmental conditions. The present investigation explored the impact of different doses of polypropylene (PP) on lentil plants and attenuation of the adverse impacts of PP by the application of pineapple fruit peel biochar (PBC). Lentil (Lens culinaris) plants exposed to PP treatment reduced morphological traits and relative water contents, reflecting photosynthetic injuries, a rise in lipid peroxidation, and electrolyte leakage. Utilization of PBC derived from waste biomass enhanced the growth attributes of lentils and alleviated PP-incited oxidative stress impacts. Polypropylene stress enhanced oxidative stress and increased enzymatic and non-enzymatic antioxidant variables in lentil plants. Antioxidant enzymes superoxide dismutase, catalase, ascorbate peroxidase, glutathione reductase, and glyoxalase enzymes were markedly upregulated in lentil after PBC amendment in PP3-treated soil. There was a significant reduction in methylglyoxal content by the activities of glyoxylase enzymes, minimizing the negative impacts of PP. Therefore, soil amendment with PBC protected lentil plants from PP-instigated oxidative disruption by modulating activities of antioxidant defense and glyoxalase system. Production of PBC from biomass wastes results in a safe, cost-effective, and ecofriendly material that can be used at the industrial level for the cultivation of crops in PP-contaminated soil. The novelty of the present research lies in promoting soil management practices and fostering our understanding of waste materials reutilization as renewable assets to combat the ecological implications of plastic pollution, and it emphasizes the treatment of plastic wastes with other waste materials and their practical applications to overcome plastic pollution.