Isolation of mesotrione-degrading bacteria from aquatic environments in Brazil

Marcos Pileggi, Sônia Alvim Veiga Pileggi, Luiz Ricardo Olchanheski, Paulo Augusto Garbugio da Silva, Ana M. Munoz Gonzalez, Willian C. Koskinen, Brian Barber, Michael Jay Sadowsky

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


Mesotrione is a benzoylcyclohexane-1,3-dione herbicide that inhibits 4-hydroxyphenyl pyruvate dioxygenase in target plants. Although it has been used since 2000, only a limited number of degrading microorganisms have been reported. Mesotrione-degrading bacteria were selected among strains isolated from Brazilian aquatic environments, located near corn fields treated with this herbicide. Pantoea ananatis was found to rapidly and completely degrade mesotrione. Mesotrione did not serve as a sole C, N, or S source for growth of P. ananatis, and mesotrione catabolism required glucose supplementation to minimal media. LC-MS/MS analyses indicated that mesotrione degradation produced intermediates other than 2-amino-4-methylsulfonyl benzoic acid or 4-methylsulfonyl-2-nitrobenzoic acid, two metabolites previously identified in a mesotrione-degrading Bacillus strain. Since P. ananatis rapidly degraded mesotrione, this strain might be useful for bioremediation purposes.

Original languageEnglish (US)
Pages (from-to)1127-1132
Number of pages6
Issue number11
StatePublished - Mar 2012

Bibliographical note

Funding Information:
The authors thank CAPES for financial support to M. Pileggi and to CNPq for travel grants to the USA. We also thank Syngenta Crop Protection for providing pure mesotrione.


  • Biodegradation
  • Bioremediation
  • Callisto
  • Pantoea ananatis
  • Xenobiotic


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