Bioremediation of mercury and the importance of bacterial mer genes

Dash, Hirak Ranjan; Das, Surajit

doi:10.1016/j.ibiod.2012.07.023

Cited by 195 publications

(86 citation statements)

References 69 publications

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“…The bacterial isolates harboring mer operons contain many functional genes like merA, merB (optional in broad-spectrum mercury-resistant bacteria), merT, merP, and merF as well as operator and promoter regions. The mer operon is a positively inducible operon and is responsible for the detoxification of mercury by converting the organic form (CÀHg) to the inorganic form (Hg 21 , Hg 2 21 ), mediated by MerB (organomercurial lyase) followed by conversion of inorganic mercury to elemental/volatile mercury by MerA (mercuric ion reductase) (Osborn et al, 1997;Barkay et al, 2003;De et al, 2008;Dash and Das, 2012). The volatile mercury is relatively less toxic in nature and goes to the atmosphere, causing less damage to the environment.…”

Section: Introductionmentioning

confidence: 99%

Mercury Pollution and Bioremediation—A Case Study on Biosorption by a Mercury-Resistant Marine Bacterium

Dash

Das

2014

Microbial Biodegradation and Bioremediation

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Section: Introductionmentioning

confidence: 99%

Mercury Pollution and Bioremediation—A Case Study on Biosorption by a Mercury-Resistant Marine Bacterium

Dash

Das

2014

Microbial Biodegradation and Bioremediation

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“…The used methods could be of biological nature, such as accumulation in tissues of plants, for example in a known hyperaccumulator S. natans. In addition, the literature review reports the removal of mercury from the water by bacteria of the genus Psuedomonas and Kleibsiella [9].…”

Section: Introductionmentioning

confidence: 99%

Microbiological stimulation of phytoremediation process usingSalvinia natansto mercury contamined water

Filyarovskaya¹,

Sitarska

Traczewska

et al. 2017

E3S Web Conf.

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Abstract. An alternative to traditional cleaning methods of heavy metals in the water environment is phytoremediation. They efficiency depends on used technological process conditions as well as plant species. One of the most dangerous metallic elements mercury plays a particular role, which is a trace element and a physiologically foreign in living organisms. Mercury has a high degree of toxicity with strong affinity to thiol groups. This may cause an adverse effect on the enzymatic processes and consequently inhibiting the physiological functions. Because of high risk for human health, water environment treatment from mercury is essential proecological action. Mercury removal studies were conducted using Salvinia natans pleustofit, sampled from its natural water environment. In the first step, epiphytic bacteria, which was resistant to high concentrations of mercury (0,6 mgHg/l), was isolated from the plant and than selected by the tiles gradient mthod. In the next step, the identification using molecular biology methods was made. In the following step plant Salvinia natans was exposure to high levels of mercury in the presence of the three isolated Pseudomonas strains with exceptional resistance characteristics to environmental factors. Has been found a positive bacteria effect on the plant condition because the selected strains belong to Pseudomonas species producing materials supporting plant growth. The use of microbial stimulation to phytoremediation by hyperaccumulator Salvinia natans can multiply the effectiveness of the process.

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“…Besides, mercury mining, gold smelting, fuel combustion, and instrument manufacturing also add mercury to the environment (Moreno and others 2008). It is a major environmental pollutant, classified as a bioaccumulative toxin that persists in the environment for long periods (Dash and Das 2012). It has posed a serious threat to humans, animals, and plants (Bridges and Zalups 2004;Patra and others 2004).…”

Section: Introductionmentioning

confidence: 99%

Alleviation of Mercury Toxicity in Wheat by the Interaction of Mercury-Tolerant Plant Growth-Promoting Rhizobacteria

Gontia‐Mishra

Sapre

Sharma

et al. 2016

J Plant Growth Regul

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Heavy metal contamination of agricultural soils has increased along with industrialization. Mercury is a toxic heavy metal and a widespread pollutant in the ecosystem. Mercury-tolerant and plant growth-promoting rhizobacteria (PGPR) HG 1, HG 2, and HG 3 were isolated from the rhizosphere of plants growing in a mercury-contaminated site. These isolates were able to grow in the presence of mercury ranging from 10 to 200 lM in minimal medium and 25 to 500 lM in LB medium. The strains were characterized by morphological, biochemical, and plant growth-promoting traits. In the present study, these PGPR strains were analyzed for their involvement in metal stress tolerance in Triticum aestivum (wheat). Two bacterial strains, namely, Enterobacter ludwigii (HG 2) and Klebsiella pneumoniae (HG 3), showed better growth promotion of T. aestivum seedlings under metal stress. Different growth parameters like, water content and biochemical properties were analyzed in the PGPR-inoculated wheat plants under 75 lM HgCl 2 . Shoot length, root length, shoot dry weight, root dry weight and relative water content (RWC) were significantly higher in inoculated plants compared to uninoculated plants under stress condition. Proline content, electrolyte leakage, and malondialdehyde content (shoots and roots) were significantly lower in inoculated plants with respect to uninoculated plants under mercury stress. Therefore, it could be assumed that all these parameters collectively improve plant growth under mercury stress conditions in the presence of PGPR. Hence, these PGPRs can serve as promising candidates for increasing plant growth and also have immense potential for bioremediation of mercury-contaminated soils.

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Bioremediation of mercury and the importance of bacterial mer genes

Cited by 195 publications

References 69 publications

Mercury Pollution and Bioremediation—A Case Study on Biosorption by a Mercury-Resistant Marine Bacterium

Mercury Pollution and Bioremediation—A Case Study on Biosorption by a Mercury-Resistant Marine Bacterium

Microbiological stimulation of phytoremediation process usingSalvinia natansto mercury contamined water

Alleviation of Mercury Toxicity in Wheat by the Interaction of Mercury-Tolerant Plant Growth-Promoting Rhizobacteria

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