Heavy metal remediation and resistance mechanism ofAeromonas,Bacillus, andPseudomonas: A review

Fakhar, Ali; Gul, Bushra; Gurmani, Ali Raza; Khan, Shah Masaud; Ali, Shafaqat; Sultan, Tariq; Chaudhary, Hassan Javed; Rafique, Mazhar; Rizwan, Muhammad

doi:10.1080/10643389.2020.1863112

Cited by 110 publications

(49 citation statements)

References 229 publications

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“…Soil exposure to heavy metal contamination has also led to the establishment of heavy metal tolerant microorganisms which can be applied in the bioremediation of heavy metal polluted environments. Some of the known heavy metal resistant bacteria include representations from gram-negative bacteria such as Alcaligenes, Pseudomonas, Burkholderia and gram-positive bacteria such as Bacillus, Corynebacterium, and Arthrobacter [100,101]…”

Section: Effect Of Heavy Metal Contamination On Soil Microorganismsmentioning

confidence: 99%

Impact of Heavy Metal Pollution on the Biotic and Abiotic Components of the Environment

Ehis-Eriakha

Akemu

2022

SAJRM

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The environment comprises of biotic and abiotic components interacting as a system. The environment also contains organic and inorganic minerals in optimal concentration required by living organisms for growth, development, and metabolic activities. Due to anthropogenic activities and some natural occurrences, the availability of these elements has drastically increased in the ecosystem beyond the required threshold and permissible limits causing pollution. Heavy metal (HM) is one of the naturally occurring elements that threaten plant, animal, and human health. These HMs have been defined as elements with more than 5gcm-3 relative density that are not readily biodegradable but can be transformed from one state to another and are usually associated with toxicity or ecotoxicity. However, some heavy metals are biologically essential elements required in the body/plant or as constituents of important enzymes although in trace amounts while others are non-essential and are ranked as priority metals due to their high level of toxicity with no biological importance even at low concentrations. The non-degradability property of heavy metals contributes to its persistence and subsequent accumulation in the biota and the food chain which is of public health significance to humans and animals. The soil environment is highly prone to HM contamination due to physiological, biochemical, metabolic, and biogeochemical processes that occur within the environment mostly mediated by microbes. These microbes are inarguably the drivers of ecosystem functioning, although they are significantly the most affected by HM pollution. This review, therefore, describes the ecotoxicological effect of heavy metals with special reference to the soil environment. Other sections discussed are the toxicity and general properties of some selected heavy metal, their role as environmental pollutants and essential elements. In addition, the effect of HM on soil microbes has also been analyzed in two folds: i) reduction in microbial population and diversity and ii) increased diversity and abundance of HM-resistant microbial strains which are significant in bioremediation studies

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Section: Effect Of Heavy Metal Contamination On Soil Microorganismsmentioning

confidence: 99%

Impact of Heavy Metal Pollution on the Biotic and Abiotic Components of the Environment

Ehis-Eriakha

Akemu

2022

SAJRM

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“…Microorganisms interact with different heavy metals by employing different processes. Resistance to metal is the main mechanism of heavy metal remediation (Fakhar et al, 2020). Biosorption is the most important process in both ecological and practical terms.…”

Section: Bioremediation Of Heavy Metal By Microbesmentioning

confidence: 99%

A review of advances in bioremediation of heavy metals by microbes and plants

Kushwaha¹,

Kashyap²

2021

Journal of Natural Resource Conservation and Management

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Environmental pollution of heavy metals, either from anthropogenic sources or natural disasters, adversely affects the natural ecosystems. Accumulation of heavy metals include nickel (Ni), cobalt (Co) and chromium (Cr) in agricultural soils, irrigation waters, and drinking water. It has become a serious threat to the worldwide food security as well as human and animal health. Although some conventional methods are being used but most of them are neither cost-effective nor up to mark in efficiency. Recently, there has been increased interest in the use of microbes associated with legume plants for bioremediation of heavy metals. These microorganisms have developed various strategies for their survival in heavy metal-polluted habitats, and are known to develop and adopt different detoxifying mechanisms such as biosorption, bioaccumulation, biotransformation and biomineralization. Along with the microorganisms, plant based remediation strategy, phytoremediation, has also proved itself to be an important strategy for the removal of the heavy metal from the environment where living part can be considered as a solar-driven pump, which can extract toxic elements from the contaminated soil. This review discusses the heavy metal toxicity issues, metalmicrobes interactions, and mechanisms used by plants for remediation of these pollutants. Additionally, emphasis has been on a newer approach of fusion of traditional microbiology, biochemistry, ecology and genetic engineering as a promising and sustainable solution for removal of heavy metals from the environment.

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“…For example, the resistance of Proteobacteria to heavy metals may be because the phylum can utilize a variety of organics as carbon and energy sources [12]. The presence of large amounts of long-chain fatty and phospholipid saturation contributes to low fluidity and rigidity of the membrane Toxics 2022, 10, 302 2 of 13 to prevent the bacterial cell from contaminants [13,14]. Active efflux and precipitation are in bacterial partial resistance toward metals [15], shown in the acidophilic bacterium Acidithiobacillus ferrooxidans and Bacillus sphaericus [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Biochemical and Metabolomic Responses of Antarctic Bacterium Planococcus sp. O5 Induced by Copper Ion

Cheng

Shi

Wei

et al. 2022

Toxics

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Heavy metal pollution in the Antarctic has gone beyond our imagination. Copper toxicity is a selective pressure on Planococcus sp. O5. We observed relatively broad tolerance in the polar bacterium. The heavy metal resistance pattern is Pb2+ > Cu2+ > Cd2+ > Hg2+ > Zn2+. In the study, we combined biochemical and metabolomics approaches to investigate the Cu2+ adaptation mechanisms of the Antarctic bacterium. Biochemical analysis revealed that copper treatment elevated the activity of antioxidants and enzymes, maintaining the bacterial redox state balance and normal cell division and growth. Metabolomics analysis demonstrated that fatty acids, amino acids, and carbohydrates played dominant roles in copper stress adaptation. The findings suggested that the adaptive mechanisms of strain O5 to copper stress included protein synthesis and repair, accumulation of organic permeable substances, up-regulation of energy metabolism, and the formation of fatty acids.

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Heavy metal remediation and resistance mechanism ofAeromonas,Bacillus, andPseudomonas: A review

Cited by 110 publications

References 229 publications

Impact of Heavy Metal Pollution on the Biotic and Abiotic Components of the Environment

Impact of Heavy Metal Pollution on the Biotic and Abiotic Components of the Environment

A review of advances in bioremediation of heavy metals by microbes and plants

Biochemical and Metabolomic Responses of Antarctic Bacterium Planococcus sp. O5 Induced by Copper Ion

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