Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 27, Issue 25, Pages 31677-31685Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-09495-5
Keywords
Lipid production; Phosphorus-fed-batch; Microalgae; Heterotrophic cultivation; Polyphosphate; Biomass
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Funding
- National Natural Science Foundation of China [51708095, 51578117, 51722803]
- Fundamental Research Funds for the Central Universities [2412017QD027, 2412018ZD013, 2412018ZD042]
- Science and Technology Project of Jilin Province [20180520168JH]
- China Postdoctoral Science Foundation [2017M611302, 2018T110241]
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Intracellular phosphorus (P) accumulation can improve microalgal growth and lipid synthesis. However, large excess of P causes cell poisoning. This study utilized a P-fed-batch strategy to investigate its potential to improve the utilization of the excessive P, while avoiding toxic side effects. This strategy contributed to a more complete utilization of the intracellularly stored P, which enhanced the microalgae biomass by 10-15% by upregulating the brassinosteroid growth hormone gene at a P-fed-batch frequency of 2-8. Furthermore, the lipid content increased by 4-16% via upregulation of lipid synthesis-related genes. As a result, the P-fed-batch strategy significantly increased the lipid production by 13-19%. The content of saturated fatty acid increased by similar to 100%, implying improved combustibility and oxidative stability. This is the first study of this P-fed-batch strategy and provides a new concept for the complete utilization of excessive P.
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