Recent developments in environmental mercury bioremediation and its toxicity: A review

Kumari, Shivani; Jamwal, Rahul; Mishra, Neha; Singh, Dileep Kumar

doi:10.1016/j.enmm.2020.100283

Cited by 73 publications

(33 citation statements)

References 147 publications

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“…Hg is not metabolised, nor is it excreted, causing its bioconcentration and accumulation via food chains. For example, many instances are known of methylmercury bioconcentration via aquatic food webs particularly those based on sea food (Kumari et al, 2020, Leterme et al, 2014, Silver and Hobman, 2007. Human poisoning through inhalation, oral ingestion or uptake through the skin can manifest itself at intake levels as low as 3 μg kg -1 day -1 (ATDSR, 2019).…”

Section: Mercurymentioning

confidence: 99%

The role of roots and rhizosphere in providing tolerance to toxic metals and metalloids

Podar

Maathuis

2021

Preprint

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Human activity and natural processes have led to widespread dissemination of metals and metalloids, many of which are toxic and have a negative impact on agronomic production. Roots, as the first point of contact, are essential in endowing plants with tolerance to excess metal(loid) in the soil. The most important root responses include: adaptation of transport processes that affect uptake, efflux and long distance transport of metal(loid)s; metal(loid) detoxification within root cells via conjugation to thiol rich compounds and subsequent sequestration in the vacuole; plasticity in root architecture; the presence of bacteria and fungi in the rhizosphere that impact on metal(loid) bioavailability; the role of root exudates. In this review we will provide details on these processes and assess their relevance for the detoxification of arsenic, cadmium, mercury and zinc. Furthermore, we will assess if any of these methodologies has been tested in field conditions and whether they are effective in terms of improving crop metal(loid) tolerance.

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Section: Mercurymentioning

confidence: 99%

The role of roots and rhizosphere in providing tolerance to toxic metals and metalloids

Podar

Maathuis

2021

Preprint

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“…In biological systems, Hg is a non-essential element; therefore, usually, there are no dedicated pathways for its metabolization and/or excretion. As a consequence, Hg eventually bioaccumulates and biomagnifies through the food chain [ 2 , 3 , 4 , 5 ]. These processes are even more pronounced in the aquatic environment, where certain naturally-occurring microorganisms shift Hg speciation to methylmercury (MeHg), which is easily absorbed by phytoplankton, then subsequently transferred to zooplankton.…”

Section: Introductionmentioning

confidence: 99%

Phytoremediation and Microorganisms-Assisted Phytoremediation of Mercury-Contaminated Soils: Challenges and Perspectives

Tiodar

Văcar

Podar

2021

IJERPH

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Mercury (Hg) pollution is a global threat to human and environmental health because of its toxicity, mobility and long-term persistence. Although costly engineering-based technologies can be used to treat heavily Hg-contaminated areas, they are not suitable for decontaminating agricultural or extensively-polluted soils. Emerging phyto- and bioremediation strategies for decontaminating Hg-polluted soils generally involve low investment, simple operation, and in situ application, and they are less destructive for the ecosystem. Current understanding of the uptake, translocation and sequestration of Hg in plants is reviewed to highlight new avenues for exploration in phytoremediation research, and different phytoremediation strategies (phytostabilization, phytoextraction and phytovolatilization) are discussed. Research aimed at identifying suitable plant species and associated-microorganisms for use in phytoremediation of Hg-contaminated soils is also surveyed. Investigation into the potential use of transgenic plants in Hg-phytoremediation is described. Recent research on exploiting the beneficial interactions between plants and microorganisms (bacteria and fungi) that are Hg-resistant and secrete plant growth promoting compounds is reviewed. We highlight areas where more research is required into the effective use of phytoremediation on Hg-contaminated sites, and conclude that the approaches it offers provide considerable potential for the future.

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“…MRB or Mercury resistant bacteria have a broad spectrum of gram-positive and gram-negative bacteria. They have a peculiar mechanism of encounter and eventually convert Hg from highly toxic to non-toxic form (Dash and Das 2012;Kumari et al 2020). MRB population is proportional to the scale of Hg pollution at the site (Dash and Das 2012;Winardi et al 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Detoxification mainly converts toxic heavy metal ions to non-toxic ions (Madigan et al ). The mechanism of mercury detoxification by bacteria occurs with various systems, one of which is the reduction of Hg 2+ to Hg 0 (volatile) using mercury reductase enzyme (Hughes and Poole 1989;Madigan et al 2012;Kumari et al 2020) which is produced by merA (Kumari et al 2020). Bacteria that can reduce Hg 2+ to Hg 0 are generally mercury-resistant bacteria (Weiss et al 1977;Gopinath et al 1989;Huang et al 2010) and can be used as a bioremediation agent to reduce mercury waste in the environment (Purkan et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Indigeneous Streptomyces spp. isolated from Cyperus rotundus rhizosphere indicate high mercuric reductase activity as a pontential bioremediation agent

Rahayu

Putri

Khasanah³

et al. 2021

Biodiversitas

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Abstract. Rahayu HM, Putri WA, Khasanah AU, Sembiring L, Purwestri YA. 2021. Indigenous Streptomyces spp. isolated from Cyperus rotundus rhizosphere indicate high mercuric reductase activity as a potential bioremediation agent. Biodiversitas 22: 1519-1526. The purification and characterization of mercuric reductase of four indigenous Streptomyces spp. from Cyperus rotundus L. rhizosphere in mercury-contaminated area have been investigated. Cell-free extract was obtained by disrupting cells using sea sand at 4 °C followed by centrifugation. Mercuric reductase was purified by ammonium sulfate precipitation, dialysis, and chromatography column (DEAE Sepharose anion column chromatography). The determination of optimum pH and temperature of mercuric reductase activity was measured based on the number of NADPH2 oxidized to NADP per mg protein per minute using a spectrophotometer. The molecular weight of mercuric reductase was determined using SDS-PAGE. Result showed that the highest specific activity of mercuric reductase was recorded from Streptomyces spp. BR28. The optimum pH and temperature of cell-free extract enzyme mercuric reductase were 7.5 and 80 °C, respectively. The enzyme was purified to 431.87-fold with specific activity 21918.95 U/mg protein. SDS PAGE showed that the molecular weight of mercuric reductase in Streptomyces spp. BR 28 ranged from 50 kDa to 75 kDa. It can be concluded that Streptomyces isolates contain mercuric reductase and have potential as mercury bioremediation agent to overcome mercury contamination in the environment.

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Recent developments in environmental mercury bioremediation and its toxicity: A review

Cited by 73 publications

References 147 publications

The role of roots and rhizosphere in providing tolerance to toxic metals and metalloids

The role of roots and rhizosphere in providing tolerance to toxic metals and metalloids

Phytoremediation and Microorganisms-Assisted Phytoremediation of Mercury-Contaminated Soils: Challenges and Perspectives

Indigeneous Streptomyces spp. isolated from Cyperus rotundus rhizosphere indicate high mercuric reductase activity as a pontential bioremediation agent

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