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  11. Behavior Of Chiral Paclobutrazol In Soils: Enantioselective Degradation, Transformation Products, And Effects On Soil Microorganisms And Their Metabolic Functions

Behavior of Chiral Paclobutrazol in Soils: Enantioselective Degradation, Transformation Products, and Effects on Soil Microorganisms and Their Metabolic Functions

Haifeng Li1, Wenwen Gong1, Li Xu1

  • 1Institute of Quality Standard and Testing Technology of Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.

Environmental Science & Technology
|July 17, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Chiral paclobutrazol enantiomers exhibit distinct soil dissipation rates and degradation pathways. These plant growth regulators impact soil microbial diversity and metabolite profiles, highlighting the need for enantioselective assessments.

Area of Science:

  • Environmental Chemistry
  • Soil Science
  • Microbiology

Background:

  • Paclobutrazol, a triazole chiral plant growth regulator, is commonly used as a racemic mixture.
  • The enantioselective fate and ecological effects of chiral paclobutrazol in soil remain largely unknown.

Purpose of the Study:

  • To investigate the enantioselective dissipation dynamics, transformation products (TPs), and degradation pathways of paclobutrazol enantiomers in soil.
  • To assess the impact of chiral paclobutrazol on soil microbial communities and metabolite profiles.
  • To explore the interactions between soil microorganisms and paclobutrazol metabolites.

Main Methods:

  • Suspect and nontarget screening for transformation products.
  • High-throughput sequencing (16S rRNA and ITS) for microbial community analysis.
Keywords:
chiral paclobutrazolmicrobiology and metabolomicsnontarget screeningsoil

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  • Soil metabolomics for metabolite profiling.

    • Main Results:

    • Dissipation half-lives for R-paclobutrazol and S-paclobutrazol were 30.7 and 40.7 days, respectively, with enantiomer interconversion observed.
    • Nine novel TPs were identified, and enantioselective degradation pathways were proposed.
    • Paclobutrazol enantiomers altered microbial diversity, decreasing fungal diversity and disrupting symbiotic networks, while significantly changing the soil metabolome.

    Conclusions:

    • Chiral paclobutrazol exhibits enantioselective behavior in soil, influencing both its dissipation and degradation.
    • Paclobutrazol enantiomers significantly impact soil microbial structure and function, as well as the soil metabolome.
    • Understanding the enantioselective fate and effects of paclobutrazol is crucial for comprehensive environmental risk assessments.
    transformation products