Abstract
The intense use of pesticides in agricultural activities for the last several decades has caused contamination of the ecosystems connected with crop fields. Despite the well-documented occurrence of pesticide biodegradation by microbes, natural attenuation of atrazine (ATZ), and its effects on ecological processes in subtropical forested areas, such as Iguaçu National Park located in Brazil, has been poorly investigated. Subtropical environments sustain a great degree of fungal biodiversity, and the patterns and roles of these organisms should be better understood. This work aimed to evaluate nine ligninolytic-producer fungi isolated from the INP edge to degrade and detoxify ATZ solutions. ATZ degradation and the main metabolites produced, including deisopropylatrazine and deethylatrazine (DEA), were analyzed using dispersive liquid–liquid microextraction followed by gas chromatography-mass spectrometer. Four fungi were able to degrade ATZ to DEA, and the other five showed potential to grow and facilitate ATZ biodegradation. Furthermore, two strains of Fusarium spp. showed an enhanced potential for detoxification according to the Allium cepa (onion) test. Although the isolates produced ligninolytic enzymes, no ligninolytic activity was observed in the biodegradation of ATZ, a feature with ecological significance. In conclusion, Ascomycota fungi from the INP edge can degrade and detoxify ATZ in solution. Increasing the knowledge of biodiversity in subtropical protected areas, such as ecosystem services provided by microbes, enhances ecosystem conservation.
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Acknowledgements
We want to thank to UNILA for the facilities to develop our projects and all support of DELABEN team members while the execution of this research.
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The research was supported by UNILA University and we received no specific Grant from any funding agency to carry out this work.
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SBE, CKP, MB and RCB planned this research. SBE and MB worked analysis of ATZ degradation and the production of principal metabolites using GC–MS. SBE and RCB worked on morphological characterization, wrote the article and designed figures. GFS made the toxicity evaluation of ATZ and fungi-treated ATZ by Allium cepa test, DCD, WLA and RCB developed isolates’ molecular characterization.
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Esparza-Naranjo, S.B., da Silva, G.F., Duque-Castaño, D.C. et al. Potential for the Biodegradation of Atrazine Using Leaf Litter Fungi from a Subtropical Protection Area. Curr Microbiol 78, 358–368 (2021). https://doi.org/10.1007/s00284-020-02288-6
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DOI: https://doi.org/10.1007/s00284-020-02288-6