Abstract
The effect of nutrient starvation on lipid accumulation of Dunaliella salina A9 was studied. In nutrient starvation, cell colour changed from green to yellow (or orange) and cell growth reached stationary phase after 9 days of the culture. The study showed that under nutrient stress, decreased in cell growth is accompanied by carotenoid biosynthesis and lipid content of Dunaliella salina. The results of this study can be used to increase carotenoid and lipid production in microalgae for functional food and biofuel in the future.
Highlights
Dunaliella currently belongs to the order of Chlamydomonadales, family Dunaliellaceae, according to NCBI database [28]
Other than β-carotene, the species can accumulate good amount of secondary metabolites in industrial scale culture [20]. These secondary metabolites are produced as the organism response to different stress condition, for example glycerol is produced after salt-stress induction [12,20,24], neutral lipids and antioxidants (e.g. β-carotene) in response to macronutrient starvation [9,21,22,41] and high light intensity [2,13,18]; production of carotenoids, especially α-carotene and 9-cis β-carotene [10,17,25] in low temperature, and can intensify in the presence of multiple stresses [1,2]
Dunaliella salina cells were green in exponential growth phase from day 0 to day 9, they turned yellow or orange and cell size increased significantly in stationary growth phase (after 9 days of culture (Figure 1)
Summary
Dunaliella currently belongs to the order of Chlamydomonadales, family Dunaliellaceae, according to NCBI database [28]. Other than β-carotene, the species can accumulate good amount of secondary metabolites in industrial scale culture [20] These secondary metabolites are produced as the organism response to different stress condition, for example glycerol is produced after salt-stress induction [12,20,24], neutral lipids and antioxidants (e.g. β-carotene) in response to macronutrient starvation [9,21,22,41] and high light intensity [2,13,18]; production of carotenoids, especially α-carotene and 9-cis β-carotene [10,17,25] in low temperature, and can intensify in the presence of multiple stresses [1,2]
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