Bioremediation of Heavy Metals and Other Toxic Substances by Microorganisms

Padhan, Dhaneshwar; Rout, Pragyan Paramita; Kundu, Ritesh; Adhikary, Saju; Padhi, Purbasha Priyadarshini

doi:10.1002/9781119547976.ch12

Cited by 32 publications

(15 citation statements)

References 148 publications

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“…The uptake of metal by host was several folds. Cocultivation of seedlings with C18 interfere with the uptake capability of the host by reducing metal uptake by almost 50% (Padhan et al 2021). This is possibly due to the reason that C18 might downregulate heavy metal ATPase genes (GmHMA13, GmHMA14, GmHMA19) and GmMATE1 compared to non-inoculated plants (Bilal et al 2019).…”

Section: Discussionmentioning

confidence: 99%

Pseudocitrobacter anthropi reduces heavy metal uptake and improves phytohormones and antioxidant system in Glycine max L.

Husna

Hussain

Shah

et al. 2021

World J Microbiol Biotechnol

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Heavy metal contamination due to anthropogenic activities is a great threat to modern humanity. A novel and natural technique of bioremediation using microbes for detoxi cation of HMs while improving plants' growth is the call of the day. In this study, exposing soybean plants to different concentrations (i.e., 10 and 50 µg/mL) of chromium and arsenic showed a severe reduction in agronomic attributes, higher ROS production, and disruption in the antioxidant system. Contrarily, rhizobacterial isolate C18 inoculation not only rescued host growth, but also improved the production of nonenzymatic antioxidants (i.e., avonoids, phenolic and proline contents) and enzymatic antioxidants (i.e., CAT, APX, POD, and DPPH), higher ROS scavenging, and lower ROS accumulation. Thereby, lowering secondary oxidative stress and subsequent damage. The strain was identi ed using 16S rDNA sequencing, and was identi ed as Pseudocitrobacter anthropi. Additionally, the strain can endure metals up to 1200 µg/mL and e cient in detoxifying the effect of Cr and As, by regulating phytohormones (IAA 59.02 μg/mL and GA 101.88 nM/mL) and solubilizing inorganic phosphates, making them excellent phytostimulant, biofertilizers, and heavy metal bio-remediating agent.

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Section: Discussionmentioning

confidence: 99%

Pseudocitrobacter anthropi reduces heavy metal uptake and improves phytohormones and antioxidant system in Glycine max L.

Husna

Hussain

Shah

et al. 2021

World J Microbiol Biotechnol

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“…So, it is necessary to maintain the microbes to get efficient removal of contaminants. Recent research optimizes and develops genetically engineered microbes for safeguarding the environmental sources from toxic chemicals and metals [ 62 , 63 ]. The following section gives in detail the role of these biological creatures in the biofiltration techniques.…”

Section: Biofiltrationmentioning

confidence: 99%

A review on biofiltration techniques: recent advancements in the removal of volatile organic compounds and heavy metals in the treatment of polluted water

et al. 2022

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Good quality of water determines the healthy life of living beings on this earth. The cleanliness of water was interrupted by the pollutants emerging out of several human activities. Industrialization, urbanization, heavy population, and improper disposal of wastes are found to be the major reasons for the contamination of water. Globally, the inclusion of volatile organic compounds (VOCs) and heavy metals released by manufacturing industries, pharmaceuticals, and petrochemical processes have created environmental issues. The toxic nature of these pollutants has led researchers, scientists, and industries to exhibit concern toward the complete eradication of them. In this scenario, the development of wastewater treatment methodologies at low cost and in an eco-friendly way had gained importance at the international level. Recently, bio-based technologies were considered for environmental remedies. Biofiltration-based works have shown a significant result for the removal of volatile organic compounds and heavy metals in the treatment of wastewater. This was done with several biological sources such as bacteria, fungi, algae, plants, yeasts, etc. The biofiltration technique is cost-effective, simple, biocompatible, sustainable, and eco-friendly compared to conventional techniques. This review article provides deep insight into biofiltration technologies engaged in the removal of volatile organic compounds and heavy metals in the wastewater treatment process.

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“…The three basic mechanisms for bacterial resistance to toxic metals include—(a) detoxification or biotransformation into a non‐toxic or less toxic form, (b) extrusion of the metals from the cell via efflux pumps and (c) compartmentalization of the metals within or outside the cells (Hao et al, 2021; Rahman & Singh, 2020). Genes encoding these resistance mechanisms are diverse and are essential in bioremediation strains including those that might be designed by synthetic biology techniques (Mahbub et al, 2017; Padhan et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Complex interactions between diverse mobile genetic elements drive the evolution of metal‐resistant bacterial genomes

Mahbub,

Chénard,

Batinovic

et al. 2023

Environmental Microbiology

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In this study, we compared the genomes of three metal‐resistant bacteria isolated from mercury‐contaminated soil. We identified diverse and novel MGEs with evidence of multiple LGT events shaping their genomic structure and heavy metal resistance. Among the three metal‐resistant strains, Sphingobium sp SA2 and Sphingopyxis sp SE2 were resistant to multiple metals including mercury, cadmium, copper, zinc and lead. Pseudoxanthomonas sp SE1 showed resistance to mercury only. Whole genome sequencing by Illumina and Oxford Nanopore technologies was undertaken to obtain comprehensive genomic data. The Sphingobium and Sphingopyxis strains contained multiple chromosomes and plasmids, whereas the Pseudoxanthomonas strain contained one circular chromosome. Consistent with their metal resistance profiles, the strains of Sphingobium and Sphingopyxis contained a higher quantity of diverse metal resistance genes across their chromosomes and plasmids compared to the single‐metal resistant Pseudoxanthomonas SE1. In all three strains, metal resistance genes were principally associated with various novel MGEs including genomic islands (GIs), integrative conjugative elements (ICEs), transposons, insertion sequences (IS), recombinase in trio (RIT) elements and group II introns, indicating their importance in facilitating metal resistance adaptation in a contaminated environment. In the Pseudoxanthomonas strain, metal resistance regions were largely situated on a GI. The chromosomes of the strains of Sphingobium and Sphingopyxis contained multiple metal resistance regions, which were likely acquired by several GIs, ICEs, numerous IS elements, several Tn3 family transposons and RIT elements. Two of the plasmids of Sphingobium were impacted by Tn3 family transposons and ISs likely integrating metal resistance genes. The two plasmids of Sphingopyxis harboured transposons, IS elements, an RIT element and a group II intron. This study provides a comprehensive annotation of complex genomic regions of metal resistance associated with novel MGEs. It highlights the critical importance of LGT in the evolution of metal resistance of bacteria in contaminated environments.

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Bioremediation of Heavy Metals and Other Toxic Substances by Microorganisms

Cited by 32 publications

References 148 publications

Pseudocitrobacter anthropi reduces heavy metal uptake and improves phytohormones and antioxidant system in Glycine max L.

Pseudocitrobacter anthropi reduces heavy metal uptake and improves phytohormones and antioxidant system in Glycine max L.

A review on biofiltration techniques: recent advancements in the removal of volatile organic compounds and heavy metals in the treatment of polluted water

Complex interactions between diverse mobile genetic elements drive the evolution of metal‐resistant bacterial genomes

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