Physiological and proteomic changes suggest an important role of cell walls in the high tolerance to metals of Elodea nuttallii

Larras, Floriane; Regier, Nicole; Planchon, Sébastien; Poté, John; Renaut, Jenny; Cosio, Claudia

doi:10.1016/j.jhazmat.2013.10.016

Cited by 41 publications

(65 citation statements)

References 49 publications

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“…Indeed the THg content in macrophytes correlated with THg in water and MeHg in sediments for the respective reservoirs. These results agree with previous studies showing that E. nuttallii accumulated IHg from the water column and remobilized MeHg from the sediments in shoots (Regier et al 2012Larras et al 2013). The high THg in E. nuttallii sampled in the Zavideni Reservoir could thus reflect local MeHg production in sediments; for example, rhizospheric sediments are known as a hotspot for Hg methylation (Regier et al 2012;Cosio et al 2014).…”

Section: Discussion Dispersion and Fate Of Hg In Downstream Reservoirssupporting

confidence: 93%

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: Discussion Dispersion and Fate Of Hg In Downstream Reservoirssupporting

confidence: 93%

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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“…In E. nuttallii, the distribution of Hg at the subcellular level was similar in shoots exposed for 24 h to 76 ng/L IHg and 23 ng/L MeHg; close to 65% of THg was internalized, most probably in the vacuole, whereas approximately 40% was bound to cell walls and 5% in membranes [12,83]. When exposed to MeHg, 30% of the THg in shoots was MeHg, but inside the cells 65% of THg was MeHg [12,83]. In plants exposed by roots only, 100% of THg was internalized in shoot cells in the form of MeHg [12].…”

Section: Intracellular Distribution and Speciation Of Accumulated Hgmentioning

confidence: 96%

Effects of macrophytes on the fate of mercury in aquatic systems

Cosio

Flück

Regier

et al. 2014

Enviro Toxic and Chemistry

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Vegetated and shallow areas such as wetlands and salt marshes, as well as freshwater lakes and rivers, have been identified as hotspots for Hg methylation. The presence of aquatic macrophytes, the predominant primary producers in shallow waters, plays an important but still poorly understood role in the fate of Hg in these environments. The present review focuses on the influences of macrophytes on Hg speciation and distribution in sediments, the rhizosphere, and the water column; on Hg transformation; and on Hg release to the environment, including transfer to the trophic web. Future research will require an improved understanding of the mechanisms and the factors controlling these aspects as well as a broader general view. Thus, the main gaps in knowledge are also discussed.

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“…It is also able to accumulate pollutants. Therefore, it has been widely used as model experimental system for bioaccumulation and ecotoxicological investigations (Barrat-Segretain, 2004;Thiébaut et al, 2010;Xing et al, 2010;Regier et al, 2013;Larras et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Oxidative effects, nutrients and metabolic changes in aquatic macrophyte, Elodea nuttallii, following exposure to lanthanum

Zhang

et al. 2015

Ecotoxicology and Environmental Safety

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Physiological and proteomic changes suggest an important role of cell walls in the high tolerance to metals of Elodea nuttallii

Cited by 41 publications

References 49 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)

Effects of macrophytes on the fate of mercury in aquatic systems

Oxidative effects, nutrients and metabolic changes in aquatic macrophyte, Elodea nuttallii, following exposure to lanthanum

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