Bioaccumulation and toxicity of mercury in rooted-submerged macrophyte Vallisneria spiralis

Gupta, Manisha; Prakāsh, Chandra

doi:10.1016/s0269-7491(98)00102-x

Cited by 81 publications

(38 citation statements)

References 25 publications

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“…The results agree, in general, with the reported pattern of Hg distribution in aquatic macrophytes (e.g. Aula et al, 1994;Gupta & Chandra, 1998;Coquery & Welbourn, 1994), but the small number of samples and the relatively large variability within species hinder a better statistical analysis of these data.…”

Section: Sampling and Chemical Analysessupporting

confidence: 91%

Mercury contents in aquatic macrophytes from two reservoirs in the Paraíba do Sul: Guandú river system, SE Brazil

et al. 2006

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This paper reports on a study to determine the Hg content in the five most abundant aquatic macrophyte species (Elodea densa, Sagittaria montevidensis, Salvinia auriculata, Pistia stratiotes and Eichhornia crassipes) in two artificial reservoirs flooded by water diverted from the Paraíba do Sul river, SE Brazil. The potential of these species for Hg accumulation and their role in Hg transport along the river system due to macrophyte management were evaluated. Mercury concentrations were higher in free-floating than in rooted species. Roots were also richer in Hg than were leaves. Dry weight Hg concentrations in leaves and roots from all species varied from 46-246 ng.g -1 to 37-314 ng.g -1 , respectively. These values are higher than those reported for uncontaminated lakes in Brazil and in other tropical areas and similar to those reported for moderately contaminated sites. Mercury concentrations can be attributed to fluvial transport from the heavily industrialized Paraíba do Sul river basin. Intensive sampling of Pistia stratiotes from two sites in the Vigário reservoir was performed to evaluate the capacity of Hg incorporation in short periods of time. The results showed a significant negative correlation between Hg content and size class of individual plants, demonstrating the importance of juveniles, fast growing plants in absorbing Hg. The foremost impact related to Hg contents in the studied area concerns the periodic removal of macrophytes for reservoir management, followed by disposal in nearby areas. This results in the mobilization of 0.52 to 1.3 Kg of Hg per year, a significant fraction of the Hg burden present in reservoir waters. Disposal of such material may result in Hg leaching to river systems, affecting the Hg transfer throughout the basin.Keywords: mercury, aquatic macrophytes, artificial reservoirs. RESUMO

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Section: Sampling and Chemical Analysessupporting

confidence: 91%

Mercury contents in aquatic macrophytes from two reservoirs in the Paraíba do Sul: Guandú river system, SE Brazil

et al. 2006

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“…The supply of Hg both at moderate and high concentration reduced the concentrations of K, Ca and Mg. Reduction of K, Ca and other mineral nutrients under the influence of Hg have been reported in M. Vulgare, R. induratus (Moreno-Jimenz et al 2007) and V. spiralis (Gupta and Chandra 1998). Increased electrolytic leakage in the root tissues of Hg treated plants as observed in our study might have reduced the uptake of nutrients from the growth medium.…”

Section: Discussionsupporting

confidence: 77%

Mercury induced phytotoxicity and oxidative stress in wheat (Triticum aestivum L.) plants

Sahu

Upadhyay

Sahoo

2011

Physiol Mol Biol Plants

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The phytotoxicity and oxidative damage in response to different concentrations of Hg (0.0, 2.5, 5.0, 10 and 25 μM) were evaluated in wheat plants. The root and shoot growth, content of chlorophyll and total soluble protein declined at 10 and 25 μM Hg. Roots of the plant were more affected as compared to the shoot. The malondialdehyde (MDA) quantity enhanced in the roots of wheat plants treated with 10 and 25 μM Hg and in the leaves of plants treated with 25 μM Hg. The concentration of H 2 O 2 decreased at low concentration and increased at high concentration of Hg. The induction of enzymatic antioxidants (catalase, CAT; ascorbate peroxidase, APX; peroxidase, POX and superoxide dismutase, SOD) was found in the roots and leaves of plants with increased concentration of Hg up to 10 μM and low activities of these enzymes were observed at 25 μM Hg. Also, the level of K, Ca and Mg declined in leaf tissues of Hg treated plants. Thus wheat plants exposed to lower concentrations of Hg did not experience any oxidative stress. However, on treatment with 10 μM Hg, the roots and leaves responded differently. Both the leaves and roots of plants treated with higher concentration of Hg were subjected to comparatively greater oxidative damage and demonstrated that the antioxidative components were not able to remove the stress due to higher concentration of Hg and thus might affect the productivity in wheat plants.

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“…The photosynthetic apparatus may also be affected at various levels of PSII, oxygen-evolving complex, PSI, plastocyanin and Ferredoxin/Ferredoxin NADP + oxidoreductase (Clijsters and Van Assche, 1985;. All these effects are usually pronounced even at low concentrations of Hg and short exposure times, as several authors have reported for cyanobacteria (Lu et al, 2000), algae (Rai et al, 1991), higher plant seedlings (Prasad and Prasad, 1987a;Munzuroğlu and Geckil, 2002) and submersed aquatic plants (Gupta and Chandra, 1998;Ali et al, 2000), which are less tolerant to the toxic effects of Hg than plants growing on the surface like the water hyacinth (Küpper et al, 1996). Küpper et al (1996) reported that heavy metals can easily substitute the Mg central atom of chlorophylls, and that Hg-substituted chlorophylls are unstable and unable to emit fluorescence, measured as F s , the steady-state fluorescence.…”

Section: Discussionmentioning

confidence: 98%

Physiological responses of Eichhornia crassipes [Mart.] Solms to the combined exposure to excess nutrients and Hg

Caldelas

Iglesia-Turiño

Araus

et al. 2009

Braz. J. Plant Physiol.

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. The accumulation of P and S was reduced by the addition of HgCl 2 , and also the P and K concentrations in emerged and submerged parts respectively decreased. In contrast, the addition of HgCl 2 increased Ca and Mg concentrations in submerged parts. Furthermore, the concentration ratios of submerged/ emerged parts for Ca, Mg and P were also reduced by the addition of HgCl 2 . The interaction of HgCl 2 and KNO 3 was synergistic and decreased F v /F m , total chlorophyll content and P and Mn concentrations in emerged parts. In submerged plant parts Ca concentration increased and K content stabilized as a result of the above interaction. However, the total accumulation of Hg per plant was not reduced, thereby confirming the water hyacinth as a promising candidate for the heavy metal phytoremediation of eutrophic waters.

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Bioaccumulation and toxicity of mercury in rooted-submerged macrophyte Vallisneria spiralis

Cited by 81 publications

References 25 publications

Mercury contents in aquatic macrophytes from two reservoirs in the Paraíba do Sul: Guandú river system, SE Brazil

Mercury contents in aquatic macrophytes from two reservoirs in the Paraíba do Sul: Guandú river system, SE Brazil

Mercury induced phytotoxicity and oxidative stress in wheat (Triticum aestivum L.) plants

Physiological responses of Eichhornia crassipes [Mart.] Solms to the combined exposure to excess nutrients and Hg

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