Multimetal tolerance mechanisms in bacteria: The resistance strategies acquired by bacteria that can be exploited to ‘clean-up’ heavy metal contaminants from water

Nanda, Manisha; Kumar, Vinod; Sharma, Divakar

doi:10.1016/j.aquatox.2019.04.011

Cited by 176 publications

(62 citation statements)

References 122 publications

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“…NAJ1, NAJ3 and NAJ5 showed similar Fe removal patterns as the Fe concentrations increased. This may be because higher concentrations of Fe cause conformational alterations in nucleic acids and polypeptides and also cause a disturbance in the oxidative phosphorylation and osmotic balance of the isolates (Nanda et al 2019). NAJ5 showed the highest Fe removal for all concentrations, where the removal percentages were 82.1% (25 mg/L), 77.8% (100 mg/L) and 32% (250 mg/L).…”

Section: The Effect Of Different Fe Concentrationsmentioning

confidence: 99%

Effective Iron-accumulating Bacteria Isolated from Chemical Laboratory Drainage for Iron Removal

Hasan¹,

Jamal²,

Abdullah³

et al. 2021

J. Ecol. Eng.

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Section: The Effect Of Different Fe Concentrationsmentioning

confidence: 99%

Effective Iron-accumulating Bacteria Isolated from Chemical Laboratory Drainage for Iron Removal

Hasan¹,

Jamal²,

Abdullah³

et al. 2021

J. Ecol. Eng.

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“…Microbes do have the capability to promote plant growth and development under abiotic stress condition by enhancing the production of low-molecular-weight osmolytes, including glycinebetaine, proline and other amino acids, organic acids, nitrogen fixation, mineral phosphate solubilization and producing key enzymes such as ACC-deaminase, chitinase, and glucanase (Ahmad et al, 2011;Gupta et al, 2013). Microbes have enhanced heavy metal tolerance through transportation across cell membrane, accumulation on cell wall, intra as well as extracellular entrapment, formation of complexes and redox reactions (Nanda et al, 2019). Arbuscular mycorrhizal fungi (AMF) play an important role in mitigating the abiotic stresses through various mechanisms like increased osmotic adjustment, enhanced accumulation of proline, increased glutathione level, down regulation of stress related genes, enhanced synthesis of jasmonic acid, salicylic acid, several important inorganic nutrients and expression of stress resistance genes to enhance the defense system (Kubikova et al, 2001;Ouziad et al, 2005;Lim and Kim, 2013;Yooyongwech et al, 2013;Hashem et al, 2018).…”

Section: Tolerance Mechanisms By Plant-microbe Interactionmentioning

confidence: 99%

Plant-Microbe Interactions in Alleviating Abiotic Stress—A Mini Review

Michael

2021

Front. Agron.

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Crop plants are continuously exposed to various abiotic stresses like drought, salinity, ultraviolet radiation, low and high temperatures, flooding, metal toxicities, nutrient deficiencies which act as limiting factors that hampers plant growth and low agricultural productivity. Climate change and intensive agricultural practices has further aggravated the impact of abiotic stresses leading to a substantial crop loss worldwide. Crop plants have to get acclimatized to various environmental abiotic stress factors. Though genetic engineering is applied to improve plants tolerance to abiotic stresses, these are long-term strategies, and many countries have not accepted them worldwide. Therefore, use of microbes can be an economical and ecofriendly tool to avoid the shortcomings of other strategies. The microbial community in close proximity to the plant roots is so diverse in nature and can play an important role in mitigating the abiotic stresses. Plant-associated microorganisms, such as endophytes, arbuscular mycorrhizal fungi (AMF), and plant growth-promoting rhizobacteria (PGPR), are well-documented for their role in promoting crop productivity and providing stress tolerance. This mini review highlights and discusses the current knowledge on the role of various microbes and it's tolerance mechanisms which helps the crop plants to mitigate and tolerate varied abiotic stresses.

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“…In some cases strains both from polluted and clean environments have a similarly high level of heavy metal resistance indicating the presence of constitutive or intrinsic resistance mechanisms [23]. Microbial resistance mechanisms can be encoded by chromosomal or mostly, plasmid genes [24,25]. Microorganism species that possess plasmid-encoded resistance mechanisms are more important for eventual applications in bioremediation because those genes can easily become available for other microbial species through the horizontal gene transfer.…”

Section: Interaction Of Heavy Metals With Microorganismsmentioning

confidence: 99%

Microbial bioremediation of heavy metals

Volarić

Svirčev

Tamindžija

et al. 2021

Hem Ind

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Heavy metal pollution is one of the most serious environmental problems, due to metal ions persistence, bioavailability, and toxicity. There are many conventional physical and chemical techniques traditionally used for environmental clean-up. Due to several drawbacks regarding these methods, the use of living organisms, or bioremediation, is becoming more prevalent. Biotechnological application of microorganisms is already successfully implemented and is in constant development, with many microbial strains successfully removing heavy metals. This paper provides an overview of the main heavy metal characteristics and describes the interactions with microorganisms. Key heavy metal resistance mechanisms in microorganisms are described, as well as the main principles and types of heavy metal bioremediation methods, with details on successful pilot scale bioreactor studies. Special attention should be given to indigenous bacteria isolated from the polluted environments since such species are already adapted to contamination and possess resistance mechanisms. Utilization of bacterial biofilms or consortia could be advantageous due to higher resistance and a combination of several metabolic pathways, and thus, the possibility to remove several heavy metals simultaneously. Novel technologies covered in this review, such as nanotechnology, genetic engineering, and metagenomics, are being introduced to the field of bioremediation in order to improve the process. To conclude, bioremediation is a potentially powerful solution for cleaning the environment.

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Multimetal tolerance mechanisms in bacteria: The resistance strategies acquired by bacteria that can be exploited to ‘clean-up’ heavy metal contaminants from water

Cited by 176 publications

References 122 publications

Effective Iron-accumulating Bacteria Isolated from Chemical Laboratory Drainage for Iron Removal

Effective Iron-accumulating Bacteria Isolated from Chemical Laboratory Drainage for Iron Removal

Plant-Microbe Interactions in Alleviating Abiotic Stress—A Mini Review

Microbial bioremediation of heavy metals

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