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Glyphosate resistance and biodegradation by Burkholderia cenocepacia CEIB S5-2

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Abstract

Glyphosate is a broad spectrum and non-selective herbicide employed to control different weeds in agricultural and urban zones and to facilitate the harvest of various crops. Currently, glyphosate-based formulations are the most employed herbicides in agriculture worldwide. Extensive use of glyphosate has been related to environmental pollution events and adverse effects on non-target organisms, including humans. Reducing the presence of glyphosate in the environment and its potential adverse effects requires the development of remediation and treatment alternatives. Bioremediation with microorganisms has been proposed as a feasible alternative for treating glyphosate pollution. The present study reports the glyphosate resistance profile and degradation capacity of the bacterial strain Burkholderia cenocepacia CEIB S5-2, isolated from an agricultural field in Morelos-México. According to the agar plates and the liquid media inhibition assays, the bacterial strain can resist glyphosate exposure at high concentrations, 2000 mg·L−1. In the degradation assays, the bacterial strain was capable of fast degrading glyphosate (50 mg·L−1) and the primary degradation metabolite aminomethylphosphonic acid (AMPA) in just eight hours. The analysis of the genomic data of B. cenocepacia CEIB S5-2 revealed the presence of genes that encode enzymes implicated in glyphosate biodegradation through the two metabolic pathways reported, sarcosine and AMPA. This investigation provides novel information about the potential of species of the genus Burkholderia in the degradation of the herbicide glyphosate and its main degradation metabolite (AMPA). Furthermore, the analysis of genomic information allowed us to propose for the first time a metabolic route related to the degradation of glyphosate in this bacterial group. According to the findings of this study, B. cenocepacia CEIB S5-2 displays a great glyphosate biodegradation capability and has the potential to be implemented in glyphosate bioremediation approaches.

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Acknowledgements

The authors thank the CONAHCyT for the scholarship awarded to José Antonio Díaz Soto for their doctorate studies (Grant NO 858456) and the Doctorado en Ciencias Naturales (UAEM) program.

Funding

This work was supported by the National Council for Humanities, Science and Technology (CONAHCyT, acronym in Spanish), through the project “Bioremediation of agricultural soils contaminated by glyphosate through bacterial biodegradation and the treatment of its residues”, grant number 315903. The funders had no role in study design, data collection, analysis, decision to publish, or preparation of the manuscript.

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Alexis Rodríguez and Patricia Mussali-Galante conceived the research, designed the experiments, acquired the funding; José Antonio Díaz-Soto, María Luisa Castrejon-Godínez, and Hugo Albeiro Saldarriaga-Noreña conducted the experimental methodology; Patricia Mussali-Galante and Efraín Tovar-Sanchez conducted statistics analysis; José Antonio Díaz Soto, María Luisa Castrejón Godínez and Alexis Rodríguez wrote the original draft manuscript. Patricia Mussali-Galante, Efraín Tovar-Sánchez, María Luisa Castrejón-Godínez, and Alexis Rodríguez reviewed and edited the final manuscript. All authors read and approved the manuscript.

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Correspondence to Alexis Rodríguez.

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The present study does not contain any studies with humans or animals performed by any of the authors.

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All authors and institutions where the work was conducted have approved the content and authorship of the manuscript. The authors declare that they have no conflict of interest.

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The authors declare no competing financial interests.

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Díaz-Soto, J.A., Mussali-Galante, P., Castrejón-Godínez, M.L. et al. Glyphosate resistance and biodegradation by Burkholderia cenocepacia CEIB S5-2. Environ Sci Pollut Res 31, 37480–37495 (2024). https://doi.org/10.1007/s11356-024-33772-2

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  • DOI: https://doi.org/10.1007/s11356-024-33772-2

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