Physiological responses of Dunaliella salina and Dunaliella tertiolecta to copper toxicity

Nikookar, Keramatollah; Moradshahi, Ali; Hosseini, Leila

doi:10.1016/j.bioeng.2005.07.001

Cited by 62 publications

(35 citation statements)

References 32 publications

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“…Nevertheless, in spite of the initial inhibiting effect of cadmium on growth, cell growth increased after 72 h of exposure and for all concentrations, suggesting that both species may adapt to cadmium toxicity. The results agree with those of the other authors who report growth inhibition and adaptability caused by cadmium and other heavy metals in diverse microorganisms [6,7,30]. Growth of Scenedesmus sp.…”

Section: Resultssupporting

confidence: 95%

Effect of Cadmium on Cellular Viability in Two Species of Microalgae (Scenedesmus sp. and Dunaliella viridis)

Marcano

Carruyo

Montiel

et al. 2009

Biol Trace Elem Res

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We determined the effect of several concentrations of cadmium (0, 5, 10, and 20 microg/l) on cellular viability in the microalgae Scenedesmus sp. and Dunaliella viridis, by measuring growth at 0, 24, 48, 72, and 96 h and pigment production at 10 days. Algae were obtained from the Nonvascular Plant Laboratory collection, in the Facultad Experimental de Ciencias, Universidad del Zulia, Venezuela. Growth was measured by cellular counting, while pigment content was evaluated using conventional spectrophotometric techniques. Growth of both species decreased in the exposed cultures comparing with the control, but its behavior was similar, because in both control and exposed cultures, its was observed an adaptive phase in the first hours, as well as a growth phase after 72 h. Cadmium concentrations above 10 microg/l produced an adverse effect on pigment production, depending on the concentration and/or exhibition time. However, even though cadmium inhibited growth and pigment production, levels of both parameters indicated cellular viability, demonstrating the adaptability of the algae cultures when they were exposed to the metal.

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Section: Resultssupporting

confidence: 95%

Effect of Cadmium on Cellular Viability in Two Species of Microalgae (Scenedesmus sp. and Dunaliella viridis)

Marcano

Carruyo

Montiel

et al. 2009

Biol Trace Elem Res

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“…For carotenoids, it is another matter, since carotenoid is effective quenchers of tripletstate photosensitizers, singlet oxygen, and peroxy radicals (Wang et al, 2010), so algal cells use it to extinguish ROS from photochemical reaction with TiO 2 , and algal cells also synthesis compensatively carotenoid as an adaptation. Similar phenomena occur to various metal stresses in algae, which showed that carotenoid synthesis increase as respond to quench ROS caused by heavy metals (Bossuyt and Janssen, 2004;Nikookar et al, 2005).…”

Section: Discussionmentioning

confidence: 61%

Toxicological effects of nanometer titanium dioxide (nano-TiO2) on Chlamydomonas reinhardtii

Chen¹,

Zhou²,

Liu³

et al. 2012

Ecotoxicology and Environmental Safety

163

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“…(72-h IC50 of 740 nmol Cu(II)L −1 ). Dunaliella salina is also more sensitive to copper than D. tertiolecta (Nikookar et al 2005). This lower sensitivity was partly explained by higher ascorbate peroxidase (APX) activity observed in this species, which is an antioxidant enzyme that serves as protective mechanism to remove ROS.…”

Section: Discussionmentioning

confidence: 91%

Phenolic profile of Dunaliella tertiolecta growing under high levels of copper and iron

López

Rico

Santana-Casiano

et al. 2015

Environ Sci Pollut Res

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The present study investigates the phenolic profile of exudates and extracts of the green algae Dunaliella tertiolecta, harvested in natural seawater in the absence (control) and in the presence of Cu(II) (315 and 790 nmol L(-1)) and Fe(III) (900 nmol L(-1)) in order to identify and quantify the phenolic compounds produced under metallic stress conditions. The presence of metal ions modifies the growth of cells and changes cell metabolism by producing phenolic compounds adapted to the solution. The use of reversed-phase high-performance liquid chromatography (RP-HPLC) permitted the identification of 14 phenolic constituents. The concentration and type of polyphenols detected in cell extracts and in solution are directly related with the metal and its concentration during growth cultures, achieving 1.4 times higher levels of polyphenols under 790 nmol Cu(II) L(-1) with respect to the control experiments. Microalga excretes polyphenols to be adapted to the environmental conditions. Gentisic acid, (+) catechin and (-) epicatechin, the most prominent phenolic compounds detected in the algae extracts, showed high antioxidant activity in inhibiting 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals. This potent activity may be related to its presence in cells and exudates in high concentrations.

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Physiological responses of Dunaliella salina and Dunaliella tertiolecta to copper toxicity

Cited by 62 publications

References 32 publications

Effect of Cadmium on Cellular Viability in Two Species of Microalgae (Scenedesmus sp. and Dunaliella viridis)

Effect of Cadmium on Cellular Viability in Two Species of Microalgae (Scenedesmus sp. and Dunaliella viridis)

Toxicological effects of nanometer titanium dioxide (nano-TiO2) on Chlamydomonas reinhardtii

Phenolic profile of Dunaliella tertiolecta growing under high levels of copper and iron

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