Mercury bioaccumulation in the aquatic plant Elodea nuttallii in the field and in microcosm: Accumulation in shoots from the water might involve copper transporters

Regier, Nicole; Larras, Floriane; Bravo, Andrea G.; Ungureanu, Viorel-Gheorghe; Amouroux, David; Cosio, Claudia

doi:10.1016/j.chemosphere.2012.08.043

Cited by 61 publications

(109 citation statements)

References 50 publications

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“…Over the past 10 years, we have intensively studied the impact of an active chlor-alkali plant using both Hg-cell and Hg-free units in Romania (Bravo et al 2009(Bravo et al , 2010(Bravo et al , 2014Regier et al 2013). The Babeni Reservoir directly receiving wastewater discharges of the chlor-alkali plant in 2009 showed extremely high MeHg levels in sediments (~30 ng g dry weight in fish) with plankton and macrophytes identified as the main entry of Hg into the food chain (Table 1; Bravo et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Persistent Hg contamination and occurrence of Hg-methylating transcript (hgcA) downstream of a chlor-alkali plant in the Olt River (Romania)

Bravo

Loizeau

Dranguet

et al. 2015

Environ Sci Pollut Res

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Chlor-alkali plants using mercury (Hg) cell technology are acute point sources of Hg pollution in the aquatic environment. While there have been recent efforts to reduce the use of Hg cells, some of the emitted Hg can be transformed to neurotoxic methylmercury (MeHg). Here, we aimed (i) to study the dispersion of Hg in four reservoirs located downstream of a chlor-alkali plant along the Olt River (Romania) and (ii) to track the activity of bacterial functional genes involved in Hg methylation. Total Hg (THg) concentrations in water and sediments decreased successively from the initial reservoir to downstream reservoirs. Suspended fine size particles and seston appeared to be responsible for the transport of THg into downstream reservoirs, while macrophytes reflected the local bioavailability of Hg. The concentration and proportion of MeHg were correlated with THg, but were not correlated with bacterial activity in sediments, while the abundance of hgcA transcript correlated with organic matter and Cl− concentration, indicating the importance of Hg bioavailability in sediments for Hg methylation. Our data clearly highlights the importance of considering Hg contamination as a legacy pollutant since there is a high risk of continued Hg accumulation in food webs long after Hg-cell phase out

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Section: Introductionmentioning

confidence: 99%

Persistent Hg contamination and occurrence of Hg-methylating transcript (hgcA) downstream of a chlor-alkali plant in the Olt River (Romania)

Bravo

Loizeau

Dranguet

et al. 2015

Environ Sci Pollut Res

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“…[31] In macrophytes, unintentional transport of Hg II by Cu transport system was proposed as a major route for Hg II internalization in E. nut tallii. [19] The hypothesis of Hg uptake via high affinity Cu transporters was further supported by transcriptomic analysis revealing decrease of EnCOPT1 gene expression at increasing Hg II concentrations. [32] Thus the possible involvement of Hg 2+ binding to membrane transporters, is not as straightforward as for other metals.…”

Section: Interactions Of Mercury With Primary Producersmentioning

confidence: 68%

“…However, submerged species usually show higher Hg accumulation than emerging plants found at the same sites. [19] Accumulated Hg can be translocated from root to shoot or inversely. In fact, whereas Hg II accumulated in shoots is taken up mainly directly from the water column, accumulated CH 3 Hg in shoots seems to originate from both the pore water of sediments and the water column.…”

Section: Interactions Of Mercury With Primary Producersmentioning

confidence: 99%

Towards Mechanistic Understanding of Mercury Availability and Toxicity to Aquatic Primary Producers

Dranguet¹,

Flück²,

Regier³

et al. 2014

Chimia

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The present article reviews current knowledge and recent progress on the bioavailability and toxicity of mercury to aquatic primary producers. Mercury is a ubiquitous toxic trace element of global concern. At the base of the food web, primary producers are central for mercury incorporation into the food web. Here, the emphasis is on key, but still poorly understood, processes governing the interactions between mercury species and phytoplankton, and macrophytes, two representatives of primary producers. Mass transfer to biota surface, adsorption to cell wall, internalization and release from cells, as well as underlying toxicity mechanisms of both inorganic mercury and methylmercury are discussed critically. In addition, the intracellular distribution and transformation processes, their importance for mercury toxicity, species-sensitivity differences and trophic transfer are presented. The mini-review is illustrated with examples of our own research.

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“…Elodea nuttallii is a rooted macrophyte native to Northern America, but as a neophyte, has spread throughout the world. It is able to accumulate large amounts of metals, including Hg and Cd, and is therefore a good candidate for the aim of this study (Regier et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Looking for biomarkers of Hg exposure by transcriptome analysis in the aquatic plantElodea nuttallii

Regier

Baerlocher

Münsterkötter³

et al. 2013

E3S Web of Conferences

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Abstract.Recently developed genomics tools have a promising potential to identify early biomarkers of exposure to toxicants. In the present work we used transcriptome analysis (RNA-seq) of Elodea nuttallii -an invasive rooted macrophyte that is able to accumulate large amounts of metals-to identify biomarkers of Hg exposure. RNA-seq allowed identification of genes affected by Hg exposure and also unraveled plant response to the toxic metal: a change in energy/reserve metabolism caused by the inhibition of photosynthesis, and an adaptation of homeostasis networks to control accumulation of Hg. Data were validated by RT-qPCR and selected genes were further tested as biomarkers. Samples exposed in the field and to natural contaminated sediments clustered well with samples exposed to low metal concentrations under laboratory conditions. Our data suggest that this plant and/or this approach could be useful to develop new tests for water and sediment quality assessment.

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Mercury bioaccumulation in the aquatic plant Elodea nuttallii in the field and in microcosm: Accumulation in shoots from the water might involve copper transporters

Cited by 61 publications

References 50 publications

Persistent Hg contamination and occurrence of Hg-methylating transcript (hgcA) downstream of a chlor-alkali plant in the Olt River (Romania)

Persistent Hg contamination and occurrence of Hg-methylating transcript (hgcA) downstream of a chlor-alkali plant in the Olt River (Romania)

Towards Mechanistic Understanding of Mercury Availability and Toxicity to Aquatic Primary Producers

Looking for biomarkers of Hg exposure by transcriptome analysis in the aquatic plantElodea nuttallii

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