Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 656, Issue -, Pages 140-149Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2018.11.346
Keywords
Docosahexaenoic acid (DHA); Eicosapentaenoic acid (EPA); Monodus subterraneus; Tisochrysis lutea; Nitrogen or phosphorous stress
Categories
Funding
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Programme for Changjiang Scholars and Innovative Research Team in University
- Fundamental Research Funds for the Central Universities
- Natural Science Research Project of Higher Education Institutions of Anhui [KJ2018A0733]
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This study investigated the effect of nitrogen (N) and phosphorous (P) stress on the production of DHA or EPA and total fatty acids (TFAs) in the marine microalga Tisochrysis lutea and the freshwater microalga Monodus subterraneus. Five N or P starvation/limitation conditions (N sufficient and P limited, N sufficient and P starved, N starved and P sufficient, N starved and P limited, and N and P starved) and one N and P sufficient condition (control) were studied. The results demonstrated that the proportion of DHA or EPA among TFAs and production in the microalgae suspensions decreased (57%, 73% for N stress and 18%, 51% for P stress, respectively) under N or P stress in both microalgae compared with the N and P sufficient group. Differently, DHA dry weight content of T. lutea decreased significantly, and EPA dry weight content of M. subterraneus decreased slightly under N starved conditions. Clear differences in TFA content/production and the relationship between TFA and DHA or EPA production/content and CO2 fixation were observed between the two microalgae. These results give a new sight on the difference between marine microalgae and freshwater microalgae. Meanwhile, it gave a potential application to produce DHA or EPA and TFA combining with CO2 fixation by these microalgae. (C) 2018 Elsevier B.V. All rights reserved.
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