Impact of Seasonal Fluctuations on the Sediment-Mercury, its Accumulation and Partitioning in Halimione portulacoides and Juncus maritimus Collected from Ria de Aveiro Coastal Lagoon (Portugal)

Anjum, Naser A.; Ahmad, Iqbal; Válega, Mónica; Pacheco, Mário; Figueira, Etelvina; Duarte, Armando C.; Pereira, Eduarda

doi:10.1007/s11270-011-0799-4

Cited by 42 publications

(14 citation statements)

References 56 publications

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“…Although not statistically different, higher Hg accumulation levels were also found in the roots of plants from the CONT site that were exposed for 4 h (mean levels in exposed and control plants were 0.15 and 0.09 μg g −1 , respectively). The uptake of Hg by saltmarsh plants has been widely described, but mostly in field studies that reported the accumulation of this element in the roots [ 3 , 11 , 29 ], while short-term studies are scarce. Cabrita et al [ 5 ] pioneered in this context, with plants from another system, by describing for the first time the uptake and transport of Hg isotopes in H. portulacoides grown under hydroponic conditions.…”

Section: Discussionmentioning

confidence: 99%

“…This is probably related to a seasonal pattern of Hg accumulation in Aveiro lagoon saltmarshes. In fact, seasonal variations in Hg accumulation in H. portulacoides at Aveiro lagoon were investigated, documenting slightly higher levels in the winter than the summer, particularly in the stems and leaves [ 11 ]. Differences between winter and summer patterns may also be due to a net higher accumulation associated with the slower growth of plants occurring during the winter months.…”

Section: Discussionmentioning

confidence: 99%

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Redox Homeostasis Disclosed in the Saltmarsh Plant Halimione portulacoides upon Short Waterborne Exposure to Inorganic Mercury

Pereira,

Marques

et al. 2024

Toxics

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The saltmarsh plant Halimione portulacoides was shortly exposed to realistic levels of inorganic mercury (iHg) with the aim of investigating the adaptative processes of the roots and leaves regarding redox homeostasis, physiology, and Hg accumulation. Plants were collected at a contaminated (CONT) and a reference (REF) site to address the interference of contamination backgrounds. The influence of major abiotic variables (i.e., temperature and light) was also examined. Total Hg levels, antioxidant enzymes, lipid peroxidation (LPO), and photosynthetic activity were analyzed after 2 and 4 h of exposure. A poor accumulation of Hg in the roots was noticed, and no translocation to the stems and leaves was found, but plants from the CONT site seemed more prone to iHg uptake (in winter). Despite this, antioxidant modulation in the roots and leaves was found, disclosing, in winter, higher thresholds for the induction of enzymatic antioxidants in CONT leaves compared to REF plants, denoting that the former are better prepared to cope with iHg redox pressure. Consistently, CONT leaves exposed to iHg had remarkably lower LPO levels. Exposure did not impair photosynthetic activity, pinpointing H. portulacoides’ ability to cope with iHg toxicity under very-short-term exposure. Biochemical changes were noticed before enhancements in accumulation, reinforcing the relevance of these responses in precociously signaling iHg toxicity.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Redox Homeostasis Disclosed in the Saltmarsh Plant Halimione portulacoides upon Short Waterborne Exposure to Inorganic Mercury

Pereira,

Marques

et al. 2024

Toxics

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“…Studies on Hg in halophyte-colonized saltmarsh areas have consistently shown elevated THg levels in the rhizosphere, compared to levels found in sediments [43,44] and limited transport of Hg into stems and leaves [84][85][86]. These results suggest either reduced translocation to or weak retention of Hg species by aerial parts of the plants and/or Hg volatilization from these plant organs.…”

Section: Samplingmentioning

confidence: 99%

Air Concentrations of Gaseous Elemental Mercury and Vegetation–Air Fluxes within Saltmarshes of the Tagus Estuary, Portugal

et al. 2021

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In situ air concentrations of gaseous elemental mercury (Hg(0)) and vegetation–atmosphere fluxes were quantified in both high (Cala Norte, CN) and low-to-moderate (Alcochete, ALC) Hg-contaminated saltmarsh areas of the Tagus estuary colonized by plant species Halimione portulacoides (Hp) and Sarcocornia fruticosa (Sf). Atmospheric Hg(0) ranged between 1.08–18.15 ng m−3 in CN and 1.18–3.53 ng m−3 in ALC. In CN, most of the high Hg(0) levels occurred during nighttime, while the opposite was observed at ALC, suggesting that photoreduction was not driving the air Hg(0) concentrations at the contaminated site. Vegetation–air Hg(0) fluxes were low in ALC and ranged from −0.76 to 1.52 ng m−2 (leaf area) h−1 for Hp and from −0.40 to 1.28 ng m−2 (leaf area) h−1 for Sf. In CN, higher Hg fluxes were observed for both plants, ranging from −9.90 to 15.45 ng m−2 (leaf area) h−1 for Hp and from −8.93 to 12.58 ng m−2 (leaf area) h−1 for Sf. Mercury flux results at CN were considered less reliable due to large and fast variations in the ambient air concentrations of Hg(0), which may have been influenced by emissions from the nearby chlor-alkali plant, or historical contamination. Improved experimental setup, the influence of high local Hg concentrations and the seasonal activity of the plants must be considered when assessing vegetation–air Hg(0) fluxes in Hg-contaminated areas.

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“…However, the impact of a mixture of metals/metalloids was indicated by decreased concentrations of GSH and GSSG and the GSH:GSSG ratio in leaves and rhizomes of P. australis exposed to As (80 µM) + Cd (150 µM) + Pb (150 µM; Schroder et al, 2009). Salt marsh macrophyte Juncus maritimus performs major role of Hg phytostabilizer under environmental Hg exposure by restricting the entry of Hg accumulated at root level (Anjum et al, 2011(Anjum et al, , 2014a(Anjum et al, , 2015aMarques et al, 2011;Figueira et al, 2012). However, a portion of the rootaccumulated Hg can be transferred to aboveground parts.…”

Section: Biochemical Markers-role and Implication In Metal/metalloid-mentioning

confidence: 99%

Biophysical and Biochemical Markers of Metal/Metalloid-Impacts in Salt Marsh Halophytes and Their Implications

Anjum

Duarte

Sleimi

et al. 2016

Front. Environ. Sci.

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As a major sink, estuarine/salt marsh ecosystem can receive discharges laden with myriads of contaminants including metals/metalloids from man-made activities. Two among the major consequences of metal/metalloid-exposure in estuarine/salt marsh ecosystem flora such as halophytic plants are: (a) the excessive accumulation of light energy that in turn leads to severe impairments in the photosystem II (PS II), and (b) metal/metalloids-accrued elevation in the cellular reactive oxygen species (ROS) that causes imbalance in the cellular redox homeostasis. On one hand, plants adopt several strategies to dissipate excessive energy hence eventually to avoid damage in the PS II and maintain optimum photosynthesis. On the other hand, components of the cellular redox system quickly respond to metal/metalloid-exposure, where plants try to maintain a fine-tuning among these components, and tightly control the level of ROS and its potential consequences. Herein, major insights into, and the significance and implications of important biophysical and biochemical markers in metal/metalloid-exposed halophytes are overviewed and also highlighted main aspects so far least explored in the present context. Discussion advocates to regularly monitor and integrate studies on the highlighted herein biophysical and biochemical markers taking into account the missing aspects such as essential and non-essential metal/metalloid-speciation, -availability, and -methylation, role of the obvious microbial activities, and a comparative account of the outcomes of the studies on mixture of metal/metalloid performed in laboratory and field conditions. Thus, consideration of these missing aspects in future studies on the subject can help us to: (a) unveil the status of the metal/metalloid-contamination and -impact; (b) understand adaptive responses of salt marsh halophyte to metals/metalloids, and also (c) to devise sustainable strategies for the environmental or ecosystem management and safety.

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Impact of Seasonal Fluctuations on the Sediment-Mercury, its Accumulation and Partitioning in Halimione portulacoides and Juncus maritimus Collected from Ria de Aveiro Coastal Lagoon (Portugal)

Cited by 42 publications

References 56 publications

Redox Homeostasis Disclosed in the Saltmarsh Plant Halimione portulacoides upon Short Waterborne Exposure to Inorganic Mercury

Redox Homeostasis Disclosed in the Saltmarsh Plant Halimione portulacoides upon Short Waterborne Exposure to Inorganic Mercury

Air Concentrations of Gaseous Elemental Mercury and Vegetation–Air Fluxes within Saltmarshes of the Tagus Estuary, Portugal

Biophysical and Biochemical Markers of Metal/Metalloid-Impacts in Salt Marsh Halophytes and Their Implications

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