Mercury Increases Light Susceptibility in the Green Alga <i>Haematococcus lacustris</i>

Xyländer, Marco; Hagen, Ch.; Braune, W.

doi:10.1111/j.1438-8677.1996.tb00567.x

Cited by 20 publications

(10 citation statements)

References 46 publications

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“…The decrease in chlorophyll concentration in the present investigation due to Hg is similar to the findings in tomato plants grown with 10 μM Hg (Cho and Park 2000). In plants, mercury ions may substitute metal ions in photo- synthetic pigments causing a decrease in photosynthesis rates (Xylander et al 1996;Kupper et al 1998). Many organic compounds including chlorophylls have been used as biomarkers for the early detection of metal toxicity in plants (Prasad 2003).…”

Section: Discussionsupporting

confidence: 88%

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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Section: Discussionsupporting

confidence: 88%

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

Sahu

Upadhyay

Sahoo

2011

Physiol Mol Biol Plants

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“…However, the high level of Hg 2+ becomes strongly phytotoxic to cells and can induce visible injuries and physiological disorder (ortega-villasante et al 2005(ortega-villasante et al , Zhou et al 2007). in plants, mercury ions may substitute metal ions in photosynthetic pigments causing a decrease in photosynthesis rates (Xylander et al 1996, Kupper et al 1998. our results also indicate that the high level of Hg 2+ is strongly phytotoxic to cells and can decrease the chlorophyll content.…”

Section: Resultsmentioning

confidence: 99%

Influence of mercury on chlorophyll content in winter wheat and mercury bioaccumulation

Liu¹,

Wang²,

Chen³

et al. 2010

PLANT SOIL ENVIRON

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Mercury (Hg) is one of the major pollutants in soils because of the annual import of toxic Hg into the agricultural lands. The aims of the present studies are to investigate the effect of Hg on chlorophyll content in winter wheat var. jinan no. 17. Moreover, calcium (Ca) levels and bioaccumulation of Hg in wheat leaves were studied with the technique of inductively coupled plasma sector field mass spectrometer (iCP-SF-MS). The study conducted a range of Hg concentrations from 0~500 mg Hg/kg in the dry weight soil. The soil was artificially contaminated with Hg as follows: 0, 100, 200, and 500 mg Hg/kg as HgCl 2 . at early stages of the wheat growth, both low and high concentration of Hg stimulates chlorophyll content, but inhibits chlorophyll content at later stages of the wheat growth. Furthermore, the concentrations of Ca and Hg in wheat leaves increased with the increasing concentration of Hg on the thirty-fourth day with the technique of iCP-SF-MS. The results indicate that Hg can accelerate the absorption of Ca in winter wheat and Hg stress may affect Ca levels in wheat leaves.

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“…The pigment pattern was analysed by high‐performance liquid chromatography (HPLC) after addition of 15% H 2 O (Büch et al . 1994; Xyländer, Hagen & Braune 1996). As the epiphytic diatoms could not be removed entirely, the amount of diatom chlorophyll a (Chl a ) was calculated from the amount of chlorophyll c (Chl c) per sample.…”

Section: Methodsmentioning

confidence: 99%

Strategies providing success in a variable habitat: III. Dynamic control of photosynthesis in Cladophora glomerata

Ensminger

Xyländer

Hagen

et al. 2001

Plant Cell & Environment

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Diurnal patterns of photosynthesis were studied in July and April populations of Cladophora glomerata (L.) Kutz. from open and from shaded sites. Summer samples exposed to full sunlight showed decreased efficiency of open photosystem II at noon, and only slight differences were found between samples that had grown at open or at shaded sites. Electron transport rate was limited at highest fluence rates in shade plants, and non-photochemical quenching (NPQ) revealed faster regulation in samples from open sites. Daily course of de-epoxidation was not linearly correlated with the course of NPQ. The comparison of samples from open and from shaded sites revealed a higher capacity of thermal energy dissipation and an increase in the total amount of xanthophyll-cycle pigments (21%) in samples from open sites. In April, down-regulation of the efficiency of open photosystem II was related to lower water temperature, and hence, increased excitation pressure. In April the pool size of xanthophyll-cycle pigments was increased by 21% in comparison with summer and suggested higher levels of thermal energy dissipation via de-epoxidized xanthophylls. In both, summer and spring the amount of xanthophyll-cycle pigments was 20% higher in samples from open sites. Acclimation of C. glomerata to growth light conditions was further shown by experimental induction of NPQ, indicating NPQ increases of 23%, and increases of 77% in the reversible component of NPQ in open site samples. The effect of temperature on photosynthetic rate was non-linear, and different optimum temperatures of electron transport rate and oxygen evolution were exhibited. [References: 31

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Mercury Increases Light Susceptibility in the Green Alga Haematococcus lacustris

Cited by 20 publications

References 46 publications

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

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

Influence of mercury on chlorophyll content in winter wheat and mercury bioaccumulation

Strategies providing success in a variable habitat: III. Dynamic control of photosynthesis in Cladophora glomerata

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