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Detoxification of Atrazine by Endophytic Streptomyces sp. Isolated from Sugarcane and Detection of Nontoxic Metabolite

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Abstract

Atrazine is still one of the most used agricultural pesticides worldwide and it has been recognized as a major contaminant of surface and ground water. The aims of this research were to isolate an endophytic microorganism from leaves of sugarcane, evaluate its ability to degrade atrazine, and investigate the formation of metabolites. By sequencing of the 16S rRNA gene, the endophytic isolate atz2 was identified as Streptomyces sp. The reduction in atrazine concentration by Streptomyces sp. atz2 was 98 % and UHPLC-MS/MS analyses showed the appearance of an unknown metabolite observed as m/z 311. Ecotoxicity tests with an aquatic organism, Daphnia similis, confirmed that this metabolite was nontoxic. This mechanism of detoxification of atrazine is different from the ones of other free-living microorganisms that inhabit the soil or rhizosphere. The results show new aspects of atrazine detoxification, highlighting a new role of endophytic bacteria in plants.

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Acknowledgments

The authors would like to thank Angelis, DF and Oliveira, VJA for the ecotoxicity tests, Mazzafera, P for the use of the UHPLC-MS equipment (FAPESP/BIOEN Grant 08/58035-6), Eberlin, MN for the use of the a 7.2T LTQ FT ultra mass spectrometer, Beati, AAGF and Vendramini, CMM for the statistical analysis. This research was supported by São Paulo Research Foundation (FAPESP Grant 11/50917-2).

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Correspondence to Natalia R. S. Miyasaka.

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Mesquini, J.A., Sawaya, A.C.H.F., López, B.G.C. et al. Detoxification of Atrazine by Endophytic Streptomyces sp. Isolated from Sugarcane and Detection of Nontoxic Metabolite. Bull Environ Contam Toxicol 95, 803–809 (2015). https://doi.org/10.1007/s00128-015-1673-7

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  • DOI: https://doi.org/10.1007/s00128-015-1673-7

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