Glutathione peroxidase activity in the selenium-treated alga Scenedesmus quadricauda

Vítová, Milada; Bišová, Kateřina; Hlavová, Monika; Zachleder, Vilém; Rucki, Marián; Čížková, Mária

doi:10.1016/j.aquatox.2011.01.003

Cited by 62 publications

(37 citation statements)

References 46 publications

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“…Indeed all treatments that in some way inhibit these processes led to the accumulation of reserves (mostly in the form of starch). Examples include the effects of FdUrd, cycloheximide, sublethal temperature or high light intensities described in sections above, the effects of benzopyrene (Abarzua et al, 1985), and high concentration of selenium compounds (Geoffroy et al, 2007;Vítová et al, 2011a).…”

mentioning

confidence: 98%

Accumulation of energy reserves in algae: From cell cycles to biotechnological applications

Vítová

Bišová

Kawano

et al. 2015

Biotechnology Advances

201

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Starch and lipids are key components of algal cells and responsible for buffering variable supplies of energy and carbon that are vital for cell growth and reproduction, particularly DNA replication, nuclear and cellular division. The basic characteristics of energy reserves, their ultrastructure and localization inside the cell, regulation of their synthesis in relation to cell cycle phases, and their control by external factors, including light intensity, temperature, and carbon dioxide are described. Over the last two decades, research in this field has been boosted by possible biotechnological applications of algae for the production of biofuels from energy conserving compounds (bioethanol from starch and biodiesel from lipids). Recent findings on mechanisms that lead to an accumulation of exceptionally high levels of starch and lipids in algae will be summarized in this review. Macroelement (N, S, P) limitation, or depletion in mineral medium, as the most widely used approaches for enhancing both starch and lipid accumulation, are reviewed in detail. Potential biotechnological strategies for the economically viable overproduction of lipid and starch, such as a two-step procedure exploiting the effects of nutrient limitation and depletion, as well as the means and rationale for selecting appropriate strains, are discussed.

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mentioning

confidence: 98%

Accumulation of energy reserves in algae: From cell cycles to biotechnological applications

Vítová

Bišová

Kawano

et al. 2015

Biotechnology Advances

201

View full text Add to dashboard Cite

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“…High Se levels can damage the photosynthetic apparatus inhibiting photosynthesis, and result in excessive starch production (Vitová et al, 2011;Wang et al, 2012).…”

Section: Toxicitymentioning

confidence: 99%

Selenium and agricultural crops

Silva¹,

Costa²,

Carmona³

et al. 2017

Afr. J. Agric. Res.

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“…Microalgae are able to metabolize inorganic selenium (Se) salts to organic forms as a part of detoxification process, but at certain concentration culture growth becomes inhibited. At nanomolar concentrations Se salts can be beneficial for growth of some microalgae (Li et al 2003), but further up, at micromolar concentrations may result in a decreased growth rate, photosynthesis inhibition and disturbance to the cell ultrastructure (Morlon et al 2005; Geoffroy et al 2007; Fournier et al 2010; Vítová et al 2011; Gojkovic et al 2015). Typical Se content in freshwaters is found in the range of 0.1–2 nM (equivalent to 0.08–0.16 μg Se L −1 ), but much higher concentrations reaching 5 µM (equivalent to 400 µg Se L −1 ) have been observed in contaminated areas (Conde and Sanz Alaejos 1997; Sun et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Toxicity to microalgae culture is usually reflected as the corresponding EC50 value. For example, the EC50 values for selenite were found 80 μM in Chlamydomonas cultures (Morlon et al 2005), and 418 μM in Scenedesmus (Vítová et al 2011). At higher doses (above tens of micromoles), Se accumulation may result in inhibited photosynthesis, decreased growth rate, and changes of the cell ultrastructure (Geoffroy et al 2007; Morlon et al 2005; Vítová et al 2011).…”

Section: Introductionmentioning

confidence: 99%

The synergistic effect of Selenium (selenite, –SeO3 2−) dose and irradiance intensity in Chlorella cultures

et al. 2017

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Microalgae are able to metabolize inorganic selenium (Se) to organic forms (e.g. Se-proteins); nevertheless at certain Se concentration culture growth is inhibited. The aim of this work was to confirm the hypothesis that the limit of Se tolerance in Chlorella cultures is related to photosynthetic performance, i.e. depends on light intensity. We studied the relation between the dose and irradiance to find the range of Se tolerance in laboratory and outdoor cultures. At low irradiance (250 µmol photons m−2 s−1), the daily dose of Se below 8.5 mg per g of biomass (<20 µM) partially stimulated the photosynthetic activity (relative electron transport rate) and growth of Chlorella cultures (biomass density of ~1.5 g DW L−1) compared to the control (no Se added). It was accompanied by substantial Se incorporation to microalgae biomass (~0.5 mg Se g−1 DW). When the Se daily dose and level of irradiance were doubled (16 mg Se g−1 DW; 500 µmol photons m−2 s−1), the photosynthetic activity and growth were stimulated for several days and ample incorporation of Se to biomass (7.1 mg g−1 DW) was observed. Yet, the same Se daily dose under increased irradiance (750 µmol photons m−2 s−1) caused the synergistic effect manifested by significant inhibition of photosynthesis, growth and lowered Se incorporation to biomass. In the present experiments Chl fluorescence techniques were used to monitor photosynthetic activity for determination of optimal Se doses in order to achieve efficient incorporation without substantial inhibition of microalgae growth when producing Se-enriched biomass.Electronic supplementary materialThe online version of this article (doi:10.1186/s13568-017-0348-7) contains supplementary material, which is available to authorized users.

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Glutathione peroxidase activity in the selenium-treated alga Scenedesmus quadricauda

Cited by 62 publications

References 46 publications

Accumulation of energy reserves in algae: From cell cycles to biotechnological applications

Accumulation of energy reserves in algae: From cell cycles to biotechnological applications

Selenium and agricultural crops

The synergistic effect of Selenium (selenite, –SeO3 2−) dose and irradiance intensity in Chlorella cultures

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