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Briceño G, Lamilla C, Leiva B, Levio M, Donoso-Piñol P, Schalchli H, Gallardo F, Diez MC. Pesticide-tolerant bacteria isolated from a biopurification system to remove commonly used pesticides to protect water resources. PLoS One 2020; 15:e0234865. [PMID: 32598366 PMCID: PMC7324069 DOI: 10.1371/journal.pone.0234865] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 06/03/2020] [Indexed: 12/03/2022] Open
Abstract
In this study, we selected and characterized different pesticide-tolerant bacteria isolated from a biomixture of a biopurification system that had received continuous applications of a pesticides mixture. The amplicon analysis of biomixture reported that the phyla Proteobacteria, Firmicutes, Bacteroidetes and Actinobacteria were predominant. Six strains grew in the presence of chlorpyrifos and iprodione. Biochemical characterization showed that all isolates were positive for esterase, acid phosphatase, among others, and they were identified as Pseudomonas, Rhodococcus and Achromobacter based on molecular and proteomic analysis. Bacterial growth decreased as both pesticide concentrations increased from 10 to 100 mg L-1 in liquid culture. The Achromobacter sp. strain C1 showed the best chlorpyrifos removal rate of 0.072–0.147 d-1 a half-life of 4.7–9.7 d and a maximum metabolite concentration of 2.10 mg L-1 at 120 h. On the other hand, Pseudomonas sp. strain C9 showed the highest iprodione removal rate of 0.100–0.193 d-1 a half-life of 4–7 d and maximum metabolite concentration of 0.95 mg L-1 at 48 h. The Achromobacter and Pseudomonas strains showed a good potential as chlorpyrifos and iprodione-degrading bacteria.
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Affiliation(s)
- Gabriela Briceño
- Biotechnological Research Center Applied to the Environment (CIBAMA-BIOREN), University of La Frontera, Temuco, Chile
| | - Claudio Lamilla
- Biotechnological Research Center Applied to the Environment (CIBAMA-BIOREN), University of La Frontera, Temuco, Chile
| | - Bárbara Leiva
- Biotechnological Research Center Applied to the Environment (CIBAMA-BIOREN), University of La Frontera, Temuco, Chile
| | - Marcela Levio
- Biotechnological Research Center Applied to the Environment (CIBAMA-BIOREN), University of La Frontera, Temuco, Chile
| | - Pamela Donoso-Piñol
- Biotechnological Research Center Applied to the Environment (CIBAMA-BIOREN), University of La Frontera, Temuco, Chile
| | - Heidi Schalchli
- Biotechnological Research Center Applied to the Environment (CIBAMA-BIOREN), University of La Frontera, Temuco, Chile
| | - Felipe Gallardo
- Chemical Sciences and Natural Resource Department, University of La Frontera, Temuco, Chile
| | - María Cristina Diez
- Biotechnological Research Center Applied to the Environment (CIBAMA-BIOREN), University of La Frontera, Temuco, Chile
- Chemical Engineering Department, University of La Frontera, Temuco, Chile
- * E-mail:
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Briceño G, Levio M, González ME, Saez JM, Palma G, Schalchli H, Diez MC. Performance of a continuous stirred tank bioreactor employing an immobilized actinobacteria mixed culture for the removal of organophosphorus pesticides. 3 Biotech 2020; 10:252. [PMID: 32426204 DOI: 10.1007/s13205-020-02239-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 04/30/2020] [Indexed: 01/19/2023] Open
Abstract
In this study, we evaluated polyurethane foam (PF), volcanic rock (VR), and a modified plastic cap (MPC) as supports for the immobilization of organophosphorus (OP) pesticide-degrading actinobacterial strains. The colonization and activity of four streptomycetes were favoured by PF, which was selected as the carrier to use in a continuous stirred tank bioreactor (CSTR) that can be operated at increasing inflows of a pesticide mixture that contains the insecticides chlorpyrifos (CP) and diazinon (DZ). Our results demonstrate that the CSTR can be operated at flow rates of 10 and 40 mL h-1 with greater than 85% removal of the pesticides in the short term. A significant decrease in the efficiency of CP removal was observed at the highest inflows into the reactor. The CP and DZ loading rates in the bioreactor ranged from 0.44 to 1.68 mg L-1 h-1 and from 0.50 to 2.17 mg L-1 h-1, respectively. Although the treated wastewater exhibited moderate toxicity for Raphanus sativus, a bioreactor inoculated with a mixed culture formed by Streptomyces spp. strains AC5, AC9, GA11 and ISP13 may provide an effective biotechnological strategy for the reduction of OP pesticide residues produced during agronomic and manufacturing practices and therefore prevent environmental pesticidal pollution.
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Affiliation(s)
- Gabriela Briceño
- 1Centro de Investigación Biotecnológica Aplicada al Medio Ambiente (CIBAMA-BIOREN), Universidad de La Frontera, Av. Francisco Salazar, 01145 Temuco, Chile
| | - Marcela Levio
- 1Centro de Investigación Biotecnológica Aplicada al Medio Ambiente (CIBAMA-BIOREN), Universidad de La Frontera, Av. Francisco Salazar, 01145 Temuco, Chile
| | - María Eugenia González
- 2Departmento de Ingeniería Química, Universidad de La Frontera, Av. Francisco Salazar, 01145 Temuco, Chile
| | - Juliana María Saez
- 3Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Av. Belgrano y Pasaje Caseros, 4000 Tucumán, Argentina
| | - Graciela Palma
- 1Centro de Investigación Biotecnológica Aplicada al Medio Ambiente (CIBAMA-BIOREN), Universidad de La Frontera, Av. Francisco Salazar, 01145 Temuco, Chile
- 4Departmento de Ciencias Químicas y Recursos Naturales, Universidad de La Frontera, Av. Francisco Salazar, 01145 Temuco, Chile
| | - Heidi Schalchli
- 1Centro de Investigación Biotecnológica Aplicada al Medio Ambiente (CIBAMA-BIOREN), Universidad de La Frontera, Av. Francisco Salazar, 01145 Temuco, Chile
| | - María Cristina Diez
- 1Centro de Investigación Biotecnológica Aplicada al Medio Ambiente (CIBAMA-BIOREN), Universidad de La Frontera, Av. Francisco Salazar, 01145 Temuco, Chile
- 2Departmento de Ingeniería Química, Universidad de La Frontera, Av. Francisco Salazar, 01145 Temuco, Chile
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