Effects of sulfur limitation on nitrogen and sulfur uptake and lipid accumulation in Scenedesmus acuminatus

Sulfur limitation is a frequently exploited method for inducing lipid accumulation in microalgae. However, there is little understanding of the underlying mechanism of this process. Hence, a study was conducted to determine the effects of sulfur limitation on nitrogen and sulfur uptake, lipid produc...

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Bibliographic Details
Published in:Journal of applied phycology 2021-02, Vol.33 (1), p.301-311
Main Authors: Wang, Qianya, Zhang, Ying, Wu, Huijuan, Xu, Ning, Li, Aifen
Format: Article
Language:English
Subjects:
Accumulation
Algae
Antioxidants
Biomedical and Life Sciences
Coenzyme A
Coenzymes
Dry weight
Ecology
Fatty acids
Freshwater & Marine Ecology
Life Sciences
Lipids
Malondialdehyde
Nitrate reductase
Nitrogen
Peroxidase
Photosynthesis
Phytoplankton
Plant Physiology
Plant Sciences
Reductases
Scenedesmus acuminatus
Sulfur
Sulphur
Superoxide dismutase
Uptake
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Summary:Sulfur limitation is a frequently exploited method for inducing lipid accumulation in microalgae. However, there is little understanding of the underlying mechanism of this process. Hence, a study was conducted to determine the effects of sulfur limitation on nitrogen and sulfur uptake, lipid production strategies, and photosynthetic physiological characteristics of Scenedesmus acuminatus . A low sulfur concentration (0.076 mM; 0.25S group) decreased nitrate reductase activity and inhibited nitrogen absorption. The highest lipid productivity was obtained in the 0.75S (0.229 mM) group (221.93 mg L −1 day −1 ), significantly higher than that of the 0.5S (0.153 mM) and 0.25S groups ( p < 0.05). Acetyl-coenzyme A carboxylase (ACCase) activity was upregulated in the 0.25S group to promote the accumulation of lipid and fatty acids, and generated the maximum lipid and fatty acid content (47.27% and 43.98% of dry weight, respectively). An important supplementation of energy for lipid accumulation under low-sulfur conditions is to drive a higher proportion of cyclic electron flow. Superoxide dismutase and peroxidase activities and malondialdehyde content increased at lower sulfur concentrations, indicating the elevated antioxidant activity of S . acuminatus .
ISSN:0921-8971
1573-5176
DOI:10.1007/s10811-020-02319-6