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Title: Synergistic effect of UV radiation and nutrient limitation on chlorella fusca (Chlorophyta) cultures grown in outdoor cylindrical photobioreactors
Author: Malpartida, I.
Jerez, C. G.
Morales, M. M.
Nascimento, P.
Freire, I.
Ezequiel, J.
Rico, R. M.
Peralta, E.
Malapascua, J. R.
Florez, Y.
Masojidek, J.
Abdala, R.
Figueroa, F. L.
Navarro, E.
Keywords: Bio-optic
Biochemical composition
Chlorella fusca
In vivo chlorophyll fluorescence
Lipid peroxidation
Photosynthetic pigments
UV radiation
Issue Date: 2014
Publisher: Inter Research
Abstract: This study assessed the interactive effects of UVR and nutrient depletion on Chlorella fusca cultures on the production and accumulation of particular biomolecules. To accomplish this, algae were grown for 5 d in outdoor thin-layer cascade cultivators under 3 nutrient treatments (full nutrients, -N and -S) and then transferred to outdoor cylindrical photobiore-actors for another 5 d. Cultures were then exposed to full solar radiation (PAB) and decreased UVR. During the last 5 d, bio-optical properties, photosynthetic activity, pigments, biochemical composition and oxidative stress were assessed. Initially, nutrient depletion caused changes in productivity and cell number in a manner that affected biochemical composition. After 3 d, the percentage of lipids in the cultures under N deprivation reached values appropriate for being used as feed or food additives or for energy applications (35% of lipid content), regardless of the light conditions. A longer exposure (5 d) resulted in interactive effects of light and nutrient conditions. Specifically, PAB increased lipid content in all cases (1.3- to 2.3-fold), but particularly under S deprivation. Longer exposure to PAB also increased oxidative stress in UVR and nutrient-limited treatments (-N and -S). These results showed that the benefits expected from nutrient depletion (increase in biomolecule content e.g. lipids, carbohydrates and pigments) were modulated by the negative effects of algal UVR acclimation costs.
Peer review: yes
DOI: 10.3354/ab00595
ISSN: 1864-7782
Appears in Collections:CESAM - Artigos
DBio - Artigos

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