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  11. Organic Fertilizer Mitigated The Oxidative Stress Of Tomato Induced By Nanoplastics Through Affecting Rhizosphere Soil Microorganisms And Bacteriophage Functions

Organic fertilizer mitigated the oxidative stress of tomato induced by nanoplastics through affecting rhizosphere soil microorganisms and bacteriophage functions

Liang-Bin Zhao1, Zi-Xuan Tang2, Hui-Fang Zhai2

  • 1College of Animal Science, South China Agricultural University, Guangzhou, Guangdong 510642, China.

Journal of Hazardous Materials
|April 17, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Organic fertilizer mitigates oxidative stress in tomato plants exposed to nanoplastics by reducing reactive oxygen species and hydrogen peroxide. This approach enhances plant growth and protects against nanoplastic-induced harm.

Area of Science:

  • Environmental Science
  • Plant Science
  • Toxicology

Background:

  • Nanoplastics (NPs) are pervasive in agricultural soils, posing risks to plant health.
  • Oxidative stress is a key detrimental effect of NPs on plants, yet mitigation strategies are underexplored.
  • Polystyrene nanoplastics (PS-NPs) are a common environmental contaminant.

Purpose of the Study:

  • To investigate the efficacy of organic versus chemical fertilizers in mitigating oxidative stress in tomato plants exposed to PS-NPs.
  • To elucidate the underlying mechanisms, including phytohormone accumulation and rhizosphere microbiome changes, involved in NP stress mitigation.

Main Methods:

  • Tomato plants were exposed to PS-NPs under different fertilization regimes (organic vs. chemical).
  • Measurements included reactive oxygen species (ROS), hydrogen peroxide (H2O2), and nanoplastic internalization.
Keywords:
Organic fertilizerOxidative stressPhytohormonePolystyrene nanoplastics

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  • Phytohormone levels (salicylic acid, abscisic acid) and rhizosphere microbiome composition were analyzed.

    • Main Results:

    • Organic fertilizer significantly reduced ROS (25.63%) and H2O2 (34.58%) in tomato stems compared to chemical fertilizer under PS-NP exposure.
    • Organic fertilizer increased salicylic acid (76.53%) and abscisic acid (22.54%) accumulation, correlating with reduced oxidative stress.
    • Rhizosphere analysis revealed Actinomycetes enrichment and altered metabolic pathways (terpenoids, polyketides) under organic fertilization, influenced by bacteriophage activity.

    Conclusions:

    • Organic fertilizer effectively alleviates PS-NP-induced oxidative stress in tomato plants, independent of NP internalization.
    • Phytohormone modulation and beneficial rhizosphere microbiome shifts are key mechanisms for stress mitigation.
    • This study offers a sustainable approach to managing nanoplastic contamination in agricultural soils and protecting plant health.
    Rhizosphere