Effect of elevated temperature on the physiological responses of marine Chlorella strains from different latitudes

Barati, Bahram; Lim, Phaik Eem; Gan, Sook Yee; Poong, Sze-Wan; Phang, Siew Moi; Beardall, John

doi:10.1007/s10811-017-1198-z

Cited by 37 publications

(9 citation statements)

References 85 publications

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“…Compared with step 1 ( Fig 1 ) of the current study, we observed significant improvements ( p < 0.05) in the specific growth rate of the selected strains in step 2 ( Fig 4A ). As with lipid content, we attributed the change in growth rate at this step to the rise in temperature, which accelerated metabolic activities [ 42 ]. There were also variations in specific growth rates of the strains (ranged from 0.153 to 0.286 day -1 ).…”

Section: Resultsmentioning

confidence: 99%

Novel microalgae strains from selected lower Himalayan aquatic habitats as potential sources of green products

et al. 2022

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Microalgal biomass provides a renewable source of biofuels and other green products. However, in order to realize economically viable microalgal biorefinery, strategic identification and utilization of suitable microalgal feedstock is fundamental. Here, a multi-step suboptimal screening strategy was used to target promising microalgae strains from selected freshwaters of the study area. The resulting strains were found to be affiliated to seven closely-related genera of the family Scenedesmaceae, as revealed by both morphologic and molecular characterization. Following initial screening under upper psychrophilic to optimum mesophilic (irregular temperature of 14.1 to 35.9°C) cultivation conditions, superior strains were chosen for further studies. Further cultivation of the selected strains under moderate to extreme mesophilic cultivation conditions (irregular temperature of 25.7 to 42.2°C), yielded up to 74.12 mgL-1day-1, 19.96 mgL-1day-1, 48.56%, 3.34 μg/mL and 1.20 μg/mL, for biomass productivity, lipid productivity, carbohydrate content, pigments content and carotenoids content respectively. These performances were deemed promising compared with some previous, optimum conditions-based reports. Interestingly, the fatty acids profile and the high carotenoids content of the studied strains revealed possible tolerance to the stress caused by the changing suboptimal cultivation conditions. Overall, strains AY1, CM6, LY2 and KL10 were exceptional and may present sustainable, promising feedstock for utilization in large-scale generation of green products, including biodiesel, bioethanol, pigments and dietary supplements. The findings of this study, which exposed promising, eurythermal strains, would expand the current knowledge on the search for promising microalgae strains capable of performing under the largely uncontrolled large-scale cultivation settings.

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Section: Resultsmentioning

confidence: 99%

Novel microalgae strains from selected lower Himalayan aquatic habitats as potential sources of green products

et al. 2022

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“…when incubated at high temperatures in combination with low, but not limiting, light of 40 μmol photons · m −2 s −1 (Barati et al. ). On the other hand, under SL changes in temperature did not result in any significant change in rETR, and most importantly at 40°C, indicating for heat stability of SL cells (Fig.…”

Section: Resultsmentioning

confidence: 99%

Acclimation of thermotolerant algae to light and temperature interaction¹

Abu‐Ghosh

Dubinsky

Iluz

2020

Journal of Phycology

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Here, we explore the responses of photosynthesis and related cellular processes in the thermotolerant microalga Micractinium sp. acclimated to limiting and saturating irradiances combined with elevated temperatures, using a novel computer‐controlled multi‐sensor system. This system allows for the monitoring of online values of oxygen exchange during photosynthesis and respiration with high accuracy. Micractinium sp. cells showed maximum growth and net oxygen production rates under the optimal temperature of 25°C regardless of the light acclimation conditions. Our results show that the upper thermal threshold for Micractinium sp. photosynthesis and growth ranges between 35°C and 40°C. This microalga exhibited stable photosynthetic efficiency and effective non‐photochemical quenching (NPQ) under saturating light, and was more susceptible to temperature change when acclimated to limiting light levels. These results demonstrate that the acclimation of thermotolerant microalgae to saturating light helps to enhance the thermal tolerance of PSII. This feature results from enhanced heat stability of PSII photochemistry and oxygen evolution.

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“…MUR258 at constant high temperature and salinity can also be attributed to the fact that CO 2 is less soluble at high temperatures and high salt concentrations (Duan et al 2006) resulting in CO 2 limitation in the cultures. Several studies have also shown that short-term exposure to high temperatures has a detrimental effect on photosynthesis (Salleh and McMinn 2011;Barati et al 2018) which in turn can lead to reduced growth. Another potential factor for the cell decline at high temperature is that the dark respiration rate increases with increasing temperature (Richmond 1986).…”

Section: Discussionmentioning

confidence: 99%

Temperature and salinity effects on growth and fatty acid composition of a halophilic diatom, Amphora sp. MUR258 (Bacillariophyceae)

et al. 2020

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Diatoms are of great interest for large-scale cultivation due to their high lipid content. The ability to grow over a wide range of salinities is also of great advantage. We studied the effect of temperature and salinity on the growth, lipids and fatty acid profiles of a newly isolated halophilic diatom Amphora sp. MUR 258. Amphora sp. MUR 258 is unusual in that it grows over a wide range of temperatures (24-35°C) and salinities (7-12% (w/v) NaCl). The highest specific growth rate (SGR; 0.607 ± 0.017 day −1 ) was achieved at 7% NaCl at 35°C, and the lowest SGR (0.433 ± 0.087 day −1 ) was obtained at 9% NaCl at 25°C. The cells contained more lipids in the exponential phase, except when grown at 12% NaCl where the lipid content was higher in the stationary phase. The alga achieved its highest lipid content (57.69 ± 2.039% ash-free dry weight (AFDW) when grown at 7% NaCl at 25°C and the lowest (34.43 ± 3.955% AFDW) obtained at 12% NaCl at 35°C. The highest biomass productivity (0.171 ± 0.017 g AFDW L −1 day −1 ) and the lipid productivity (0.062 ± 0.017 g AFDW L −1 day −1 ) were achieved when the Amphora were grown at 9% NaCl at 35°C and 7% at 25°C, respectively. Irrespective of the growth conditions, the predominant fatty acids of Amphora sp. MUR 258 were palmitic acid (C16:0), stearic acid (C18:0), palmitoleic acid (C16:1) and oleic acid (C18:1), as well as low quantities of eicosapentaenoic acid (C20:5).

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Effect of elevated temperature on the physiological responses of marine Chlorella strains from different latitudes

Cited by 37 publications

References 85 publications

Novel microalgae strains from selected lower Himalayan aquatic habitats as potential sources of green products

Novel microalgae strains from selected lower Himalayan aquatic habitats as potential sources of green products

Acclimation of thermotolerant algae to light and temperature interaction¹

Temperature and salinity effects on growth and fatty acid composition of a halophilic diatom, Amphora sp. MUR258 (Bacillariophyceae)

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Effect of elevated temperature on the physiological responses of marine Chlorella strains from different latitudes

Cited by 37 publications

References 85 publications

Novel microalgae strains from selected lower Himalayan aquatic habitats as potential sources of green products

Novel microalgae strains from selected lower Himalayan aquatic habitats as potential sources of green products

Acclimation of thermotolerant algae to light and temperature interaction1

Temperature and salinity effects on growth and fatty acid composition of a halophilic diatom, Amphora sp. MUR258 (Bacillariophyceae)

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Acclimation of thermotolerant algae to light and temperature interaction¹