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Related Experiment Videos

Microbial degradation of pendimethalin.

S B Singh1, G Kulshrestha

  • 1Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi.

Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
|June 1, 1991
PubMed
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Soil fungi Fusarium oxysporum and Paecilomyces varioti degrade the herbicide pendimethalin into two metabolites. Rhizoctonia bataticola yields one metabolite, indicating microbial breakdown pathways.

Area of Science:

  • Environmental microbiology
  • Bioremediation
  • Agrochemical research

Background:

  • Pendimethalin is a widely used dinitroaniline herbicide.
  • Understanding its environmental fate is crucial for risk assessment.
  • Microbial degradation is a key pathway for pesticide dissipation in soil.

Purpose of the Study:

  • To investigate the in vitro microbial degradation of pendimethalin by soil fungi.
  • To identify the metabolites produced during pendimethalin decomposition.
  • To elucidate the biochemical pathways involved in fungal breakdown of pendimethalin.

Main Methods:

  • In vitro culture of soil fungi: Fusarium oxysporum, Paecilomyces varioti, and Rhizoctonia bataticola.
  • Incubation of fungi with pendimethalin in culture media.

Related Experiment Videos

  • Analysis of pendimethalin degradation and metabolite identification using analytical techniques.

    • Main Results:

    • Fusarium oxysporum and Paecilomyces varioti degraded pendimethalin to N-(1-Ethylpropyl)-3, 4-dimethyl-2-nitrobenzene-1, 6-diamine (II) and 3,4-Dimethyl-2, 6-dinitroaniline (IV).
    • Rhizoctonia bataticola yielded only 3,4-Dimethyl-2, 6-dinitroaniline (IV).
    • Fungal degradation involved key reactions: nitro reduction and dealkylation.

    Conclusions:

    • Specific soil fungi possess the capability to degrade pendimethalin.
    • Different fungal species exhibit distinct degradation pathways and metabolite profiles.
    • Nitro reduction and dealkylation are significant biochemical processes in pendimethalin biodegradation.