Journal
BIORESOURCE TECHNOLOGY
Volume 249, Issue -, Pages 791-798Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.10.090
Keywords
Chlorella zofingiensis; Lipid; Astaxanthin; Nutrient starvation
Funding
- National Natural Science Foundation of China [31471717]
- Public Science and Technology Research Funds Projects of Ocean [201505032]
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Chlorella zofingiensis has been proposed as a potential producer of lipids and the high-value carotenoid astaxanthin. In this study, the responses of photoautotrophic C. zofingiensis with respect to growth, lipid profiles and astaxanthin accumulation were investigated upon the starvation of N (NS), P (PS) and S (SS). NS and SS stimulated triacylglycerol (TAG) accumulation, which reached 27% and 21% of dry weight (DW), respectively. Stresses also stimulated astaxanthin accumulation greatly, reaching 3.9 mg/g DW by NS. SS led to the highest TAG productivity (52.4 mg L-1 d(-1)) while NS gave rise to the highest astaxanthin productivity (0.624 mg L-1 d(-1)). In combination with transcriptional analysis, a working model for stress-associated TAG and astaxanthin biosynthesis was proposed. Taken together, these detailed data shed light on the elucidation of differential responses to nutrient stresses and may provide insights into future engineering of this promising alga for improving TAG and astaxanthin production.
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