Improving the content of high value compounds in Nordic Desmodesmus microalgal strains
2022
Mehariya, Sanjeet | Plöhn, Martin | Leon-Vaz, Antonio | Patel, Alok | Funk, Christiane
Nordic Desmodesmus microalgal strains (2–6) and (RUC-2) were exposed to abiotic stress (light and salt) to enhance lipids and carotenoids. The biomass output of both strains increased by more than 50% during light stress of 800 μmol m⁻² s⁻¹ compared to control light. The biomass of Desmodesmus sp. (2–6) contained most lipids (15% of dry weight) and total carotenoids (16.6 mg g⁻¹) when grown at moderate light stress (400 μmol m⁻² s⁻¹), which further could be enhanced up to 2.5-fold by salinity stress. Desmodesmus sp. (RUC-2) exhibited maximal lipid (26.5%) and carotenoid (43.8 mg L⁻¹) content at light intensities of 400 and 100 μmol m⁻² s⁻¹, respectively. Salinity stress stimulated lipid accumulation by 39%. Nordic Desmodesmus strains therefore are not only able to tolerate stress conditions, but their biomass considerably improves under stress. These strains have high potential to be used in algal bio-factories on low-cost medium like Baltic seawater.
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