Ferric Sulfate and Proline Enhance Heavy-Metal Tolerance of Halophilic/Halotolerant Soil Microorganisms and Their Bioremediation Potential for Spilled-Oil Under Multiple Stresses

Al-Mailem, Dina M.; Eliyas, M.; Radwan, S. S.

doi:10.3389/fmicb.2018.00394

Cited by 14 publications

(11 citation statements)

References 34 publications

(41 reference statements)

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“…However, the presence of specific compounds could contribute to enhance the tolerance of several species to heavy metals. A recent study has investigated the effect of heavy metal concomitating with hydrocarbon degradation in hypersaline systems [96,122]. In this study, the growth of strains of both Archaea (a strain of Haloferax elongans and a Halobacterium salinarum) and Bacteria (a strain each of Arhodomonas, Marinobacter, and Halomonas) was inhibited in the presence of high levels of Hg, Pb, Cu, Cd, and As and the inhibition was even more sensitive to these metals in the presence of crude oil [55].…”

Section: Haloarchaea As Model Organisms For Bioremediation Of Heavy Metals Contaminated Sites: the Case Of Cadmiummentioning

confidence: 99%

Insights on Cadmium Removal by Bioremediation: The Case of Haloarchaea

Vera-Bernal

Martínez‐Espinosa

2021

Microbiology Research

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Although heavy metals are naturally found in the environment as components of the earth’s crust, environmental pollution by these toxic elements has increased since the industrial revolution. Some of them can be considered essential, since they play regulatory roles in different biological processes; but the role of other heavy metals in living tissues is not clear, and once ingested they can accumulate in the organism for long periods of time causing adverse health effects. To mitigate this problem, different methods have been used to remove heavy metals from water and soil, such as chelation-based processes. However, techniques like bioremediation are leaving these conventional methodologies in the background for being more effective and eco-friendlier. Recently, different research lines have been promoted, in which several organisms have been used for bioremediation approaches. Within this context, the extremophilic microorganisms represent one of the best tools for the treatment of contaminated sites due to the biochemical and molecular properties they show. Furthermore, since it is estimated that 5% of industrial effluents are saline and hypersaline, halophilic microorganisms have been suggested as good candidates for bioremediation and treatment of this kind of samples. These microorganisms, and specifically the haloarchaea group, are of interest to design strategies aiming the removal of polluting compounds due to the efficiency of their metabolism under extreme conditions and their significant tolerance to highly toxic compounds such as heavy metals, bromate, nitrite, chlorate, or perchlorate ions. However, there are still few trials that have proven the bioremediation of environments contaminated with heavy metals using these microorganisms. This review analyses scientific literature focused on metabolic capabilities of haloarchaea that may allow these microbes to tolerate and eliminate heavy metals from the media, paying special attention to cadmium. Thus, this work will shed light on potential uses of haloarchaea in bioremediation of soils and waters negatively affected by heavy metals, and more specifically by cadmium.

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Section: Haloarchaea As Model Organisms For Bioremediation Of Heavy Metals Contaminated Sites: the Case Of Cadmiummentioning

confidence: 99%

Insights on Cadmium Removal by Bioremediation: The Case of Haloarchaea

Vera-Bernal

Martínez‐Espinosa

2021

Microbiology Research

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“…Cocontamination of different types of pollutants often complicates bioremediation, and a recent study has investigated the effect of heavy metal cocontamination with hydrocarbon degradation in hypersaline systems [ 55 ]. Strains of both Archaea (a strain of Haloferax elongans and a Halobacterium salinarum ) and Bacteria (a strain each of Arhodomonas , Marinobacter , and Halomonas ) were inhibited with elevated levels of Hg, Pb, Cu, Cd, and As and were more sensitive to these metals in the presence of crude oil [ 55 ]. Overall, the archaeal strains had less tolerance for heavy metals than three halophilic/halotolerant Bacteria tested, though the bacterial genus Kocuria had similar levels of sensitivity to heavy metal toxicity [ 55 ].…”

Section: Archaea In the Degradation Of Organicsmentioning

confidence: 99%

“…Strains of both Archaea (a strain of Haloferax elongans and a Halobacterium salinarum ) and Bacteria (a strain each of Arhodomonas , Marinobacter , and Halomonas ) were inhibited with elevated levels of Hg, Pb, Cu, Cd, and As and were more sensitive to these metals in the presence of crude oil [ 55 ]. Overall, the archaeal strains had less tolerance for heavy metals than three halophilic/halotolerant Bacteria tested, though the bacterial genus Kocuria had similar levels of sensitivity to heavy metal toxicity [ 55 ]. For the Haloferax elongans , Fe III amendment lessened the toxicity of Hg, Pb, Cu, and Cd, while for the Halobacterium salinarum , Fe III amendment lessened the toxicity of Cu, Cd, and As and proline lessened the toxicity limit of Cd [ 55 ].…”

Section: Archaea In the Degradation Of Organicsmentioning

confidence: 99%

“…Overall, the archaeal strains had less tolerance for heavy metals than three halophilic/halotolerant Bacteria tested, though the bacterial genus Kocuria had similar levels of sensitivity to heavy metal toxicity [ 55 ]. For the Haloferax elongans , Fe III amendment lessened the toxicity of Hg, Pb, Cu, and Cd, while for the Halobacterium salinarum , Fe III amendment lessened the toxicity of Cu, Cd, and As and proline lessened the toxicity limit of Cd [ 55 ]. For the Halobacterium salinarum , the rate of crude oil consumption was tested under heavy metal stress with and without Fe III or proline amendment.…”

Section: Archaea In the Degradation Of Organicsmentioning

confidence: 99%

“…For the Halobacterium salinarum , the rate of crude oil consumption was tested under heavy metal stress with and without Fe III or proline amendment. The crude oil degradation rate increased significantly under Hg or Pb stresses with Fe III or proline amendment, while the enhancement of oil consumption rates in Cu-, Cd-, and As-stressed cultures were more nuanced [ 55 ]. At low-salt concentrations (<1.5 M), many of these heavy metals, to a certain concentration, increased cell growth presumably from affecting cytoplasmic osmolality [ 55 ].…”

Section: Archaea In the Degradation Of Organicsmentioning

confidence: 99%

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Diversity and Niche of Archaea in Bioremediation

Krzmarzick

Taylor

Xiang

et al. 2018

Archaea

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Bioremediation is the use of microorganisms for the degradation or removal of contaminants. Most bioremediation research has focused on processes performed by the domain Bacteria; however, Archaea are known to play important roles in many situations. In extreme conditions, such as halophilic or acidophilic environments, Archaea are well suited for bioremediation. In other conditions, Archaea collaboratively work alongside Bacteria during biodegradation. In this review, the various roles that Archaea have in bioremediation is covered, including halophilic hydrocarbon degradation, acidophilic hydrocarbon degradation, hydrocarbon degradation in nonextreme environments such as soils and oceans, metal remediation, acid mine drainage, and dehalogenation. Research needs are addressed in these areas. Beyond bioremediation, these processes are important for wastewater treatment (particularly industrial wastewater treatment) and help in the understanding of the natural microbial ecology of several Archaea genera.

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