Changes in carbon uptake mechanisms in two green marine algae by reduced seawater pH

Moazami-Goudarzi, Maryam; Colman, Brian

doi:10.1016/j.jembe.2011.11.017

Cited by 29 publications

(4 citation statements)

References 23 publications

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“…In this connection, ultraviolet light adversely affects the alga primarily due to the damage to the photosynthetic machinery in the cells (Pessoa, 2012). Similarly increased exposure to UV-B alleviated N 2 -deprivation in green algae as described by Moazami-Goudarzi and Colman (2012). These reports indicated that genotypic differences, assimilation and utilization and stage of growth are involved in the interaction of UV-B and N 2 -deprivation stresses.…”

Section: Discussionsupporting

confidence: 55%

Evaluation of radical scavenging system in two microalgae in response to interactive stresses of UV-B radiation and nitrogen starvation

Al-Rashed

Ibrahim

El-Gaaly

et al. 2016

Saudi Journal of Biological Sciences

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The effects of UV-B radiation and/or deprivation of nitrogen stresses on growth rate, some antioxidant compounds, and activities of some antioxidant enzymes, superoxide dismutase (SOD; EC1.15.1.1), ascorbate peroxidase (APx; EC1.11.1.11), guaiacol peroxidase (GUPx; EC1.11.1.7) and glutathione reductase (GR, EC 1.6.4.2), as well as the levels of total glutathione pool, UV-B absorbing pigments, malondialdehyde (MDA) and HO concentrations were studied in and Less damage was observed in response to the combined UV-B and nitrogen deprivation as shown by growth rate and photosynthetic pigments especially in . A significant increase in flavonoids and phenolics under dual stress was observed. Conversely, a great reduction in malondialdehyde (MDA) and HO concentrations were recorded under the combined stress compared to the effect of each stress. Furthermore, a significant increase in GSH/GSSG ratio toward the control was recorded in response to combined stresses, whereas a significant reduction in this ratio was observed in both microalgae in response to each stress. Increased activities of antioxidant enzymes were recorded under UV-B and nitrogen deprivation stresses.

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Section: Discussionsupporting

confidence: 55%

Evaluation of radical scavenging system in two microalgae in response to interactive stresses of UV-B radiation and nitrogen starvation

Al-Rashed

Ibrahim

El-Gaaly

et al. 2016

Saudi Journal of Biological Sciences

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“…Under alkaline conditions whereby the extracellular pH is higher than intracellular pH, the cell must rely on active transport of HCO 3 − and not on passive flux of CO 2 − for inorganic carbon accumulation [121,137]. Affinity of algae for CO 2 increases at lower pH [121,123].…”

Section: Phmentioning

confidence: 99%

Effects of Environmental Factors and Nutrient Availability on the Biochemical Composition of Algae for Biofuels Production: A Review

2013

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Due to significant lipid and carbohydrate production as well as other useful properties such as high production of useful biomolecular substrates (e.g., lipids) and the ability to grow using non-potable water sources, algae are being explored as a potential high-yield feedstock for biofuels production. In both natural and engineered systems, algae can be exposed to a variety of environmental conditions that affect growth rate and cellular composition. With respect to the latter, the amount of carbon fixed in lipids and carbohydrates (e.g., starch) is highly influenced by environmental factors and nutrient availability. Understanding synergistic interactions between multiple environmental variables and nutritional factors is required to develop sustainable high productivity bioalgae systems, which are essential for commercial biofuel production. This article reviews the effects of environmental factors (i.e., temperature, light and pH) and nutrient availability (e.g., carbon, nitrogen, phosphorus, potassium, and trace metals) as well as cross-interactions on the biochemical composition of algae with a special focus on carbon fixation and partitioning of carbon from a biofuels perspective.

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“…If CCMs are down-regulated, which has been described for some eukaryotic macro-and microalgal species exposed to increased CO 2 only, then productivity might be increased (Beardall & Giordano 2002, Cornwall et al 2012. The benefit is argued to be imbued by potential reductions in CCM maintenance costs, with savings varying dependent on the specific CCM mechanisms involved (Kübler & Raven 1994, Beardall et al 1998, Beardall & Giordano 2002, Moazami-Goudarzi & Colman 2012.…”

Section: Introductionmentioning

confidence: 92%

Warming and acidification promote cyanobacterial dominance in turf algal assemblages

Bender¹,

Díaz-Pulido²,

Dove³

2014

Mar. Ecol. Prog. Ser.

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As marine ecosystems are predicted to be facing increases in both temperature and CO 2 levels, resulting in increased acidity, scientific research is attempting to predict the effect that the altered environmental conditions will have on species, communities and, ultimately, ecosystems. This study focused on elevated temperature and ocean acidification effects on the ubiquitous, yet often overlooked, turf algal assemblages on the Great Barrier Reef, Australia. In order to assess possible changes in relative abundance of species, biomass and productivity, 3 different levels of pH and 2 different levels of temperature treatments were applied to shallow water turf algal assemblages in a multifactorial (orthogonal) experiment. The eukaryotic component of the algal assemblages showed differential responses to combinations of pH and temperature treatments. The response was however dominated by a strong increase in the relative abundance of Lyngbya, a cyanobacterium, under acidification and higher temperature treatment levels, while other cyanobacteria, such as the Rivulariaceae, did not respond to the altered environment. Possible explanations for this observation may be differences in nitrogen fixation capacity and/or temperature optima. The biomass of the algal assemblages remained stable under all treatment levels, while changes in productivity associated with an interaction of the factors were observed. The findings of this experimental study highlight the complexity of turf algal assemblages in their composition and in their response to altered environmental conditions. However, they also support the dominant theoretical physiological predictions for eukaryotic and prokaryotic turf algae that suggest a positive or neutral response to future environmental conditions.

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Changes in carbon uptake mechanisms in two green marine algae by reduced seawater pH

Cited by 29 publications

References 23 publications

Evaluation of radical scavenging system in two microalgae in response to interactive stresses of UV-B radiation and nitrogen starvation

Evaluation of radical scavenging system in two microalgae in response to interactive stresses of UV-B radiation and nitrogen starvation

Effects of Environmental Factors and Nutrient Availability on the Biochemical Composition of Algae for Biofuels Production: A Review

Warming and acidification promote cyanobacterial dominance in turf algal assemblages

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