Abstract
Heavy-metal (HM) contamination is a huge environmental problem in many countries including Mexico. Currently, microorganisms with multiple heavy-metal resistance and/or plant-promoting characteristics have been widely used for bioremediation of HM-contaminated soils. The aim of the study was isolated bacteria with multiple heavy-metal resistance and to determinate the resistance mechanism developed by these organisms. A total of 138 aerobic bacteria were isolated from soil and sediments surrounding the Lerma–Chapala basin located in the boundary of the States of Michoacán and Jalisco states of Mexico. One hundred and eight strains showed at least 1 plant growth-promoting features. The Lerma–Chapala basin bacteria were also resistant to high concentrations of HMs including the metalloid arsenic. Sequence analysis of 16S RNA genes reveled that these bacteria were mainly affiliated to the phyla Proteobacteria (38%), Firmicutes (31%) and Actinobacteria (25%), covering 21 genera with Bacillus as the most abundant one. Among them, at least 27 putative novel species were detected in the genera Acinetobacter, Arthrobacter, Bacillus, Agrobacterium, Dyadobacter, Enterobacter, Exiguobacterium, Kluyvera, Micrococcus, Microbacterium and Psychrobacter. In addition, these bacteria developed various heavy-metal-resistance mechanisms, such as biosorption/bioaccumulation, immobilization and detoxification. Therefore, the bacteria isolated from soils and sediments of Lerma–Chapala basin could be used in bioremediation strategies.
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Acknowledgements
This study was financially supported by the projects SIP20140353, SIP20140354, SIP20150311 and SIP20150358. I. Arroyo-Herrera received scholarships from the Consejo Nacional de Ciencia y Tecnología (CONACyT) and BEIFI-IPN. B. Román-Ponce received postdoctoral scholarships from the CONACyT-323687. P. Estrada-de los Santos, E. T. Wang and M. S. Vásquez-Murrieta appreciate the scholarships of Comisión de Operación y Fomento de Actividades Académicas-IPN and Estímulos al Desempeño de los Investigadores-IPN and Sistema Nacional de Investigadores-CONACyT.
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IAH, BRP, PES, EW and MSVM were involved in the design of the project. IAH and BRP standardized the methodology. IAH, ALRM and BRP evaluated resistance mechanism. BRP, PES, EW and MSVM wrote the manuscript. All the authors read and approved the final manuscript. MSVM supervised each stage of the experiment.
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Arroyo-Herrera, I., Román-Ponce, B., Reséndiz-Martínez, A.L. et al. Heavy-metal resistance mechanisms developed by bacteria from Lerma–Chapala basin. Arch Microbiol 203, 1807–1823 (2021). https://doi.org/10.1007/s00203-020-02140-2
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DOI: https://doi.org/10.1007/s00203-020-02140-2