Isolation, identification, and characterization of bacterial strains with potential for degradation of the pesticides chlorothalonil and chlorpyrifos

 

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Bibliographic Details
Authors: Estrada-Gamboa, Joyce, Umaña-Castro, Rodolfo, Sancho-Blanco, Carolina, Orozco-Aceves, Martha
Format: artículo original
Status:Versión publicada
Publication Date:2023
Description:Indiscriminate use of highly toxic pesticides in agriculture has produced soil contamination and deterioration of ecosystems. A promising solution to this environmental problem is bioremediation, which includes the use of bacteria to degrade contaminating substances. [Objective] The objective of this work was to isolate, identify, and characterize bacterial strains capable of degrading the pesticides chlorothalonil and chlorpyrifos to determine their potential use in bioremediation of contaminated soils. [Methodology] The strains were isolated from agricultural soils using enrichment cultures containing chlorothalonil or chlorpyrifos (20 mg/L) as the sole carbon source. The isolated strains were characterized by their morphology, by their physiological responses to 48 biochemical tests and sensitivity to 15 antibiotics, by their growth kinetics, and in molecular terms (amplification of the gene rDNA 16S). [Results] In total, three strains were isolated, one capable of using (and degrading) chlorpyrifos, identified as Stenotrophomonas maltophilia, and two bacterial strains with a partial ability to use chlorothalonil as a carbon source, identified as Enterobacter cloacae and Ochrobactrum anthropi. The three bacterial species are Gram-negative bacilli and have diverse physiological characteristics, including variable resistance to certain antibiotics. [Conclusion] It is concluded that the isolated bacteria have biotechnological potential to be incorporated into a bioremediation strategy for contaminated soils, especially for the elimination of chlorpyrifos. Finally, further research perspectives are proposed to determine more efficient processes of chlorothalonil degradation by cometabolism.  
Country:Portal de Revistas UNA
Institution:Universidad Nacional de Costa Rica
Repositorio:Portal de Revistas UNA
Language:Español
OAI Identifier:oai:ojs.www.una.ac.cr:article/17613
Online Access:https://www.revistas.una.ac.cr/index.php/uniciencia/article/view/17613
Keyword:Bacterial bioremediation
chlorpyrifos
chlorothalonil
fungicide
insecticide
soil contamination
biorremediación bacteriana
clorpirifos
clorotalonil
contaminación del suelo
fungicida
insecticida
biorremediação bacteriana
clorpirifós
contaminação do solo
inseticida