Abstract
This study systematically examined the effect of nitrogen and phosphorous stress on the formation of linoleic acid (LA), arachidonic acid (ARA), and eicosapentaenoic acid (EPA) in Porphyridium cruentum gy-h56. P. cruentum was cultivated in six different media conferring different conditions of nitrogen (N) sufficiency/deprivation and phosphorous (P) sufficiency/limitation/deprivation. Over a 16-day cultivation process, the dry-weight content, proportion of total fatty acids (TFAs), and the concentration in the medium of linoleic acid (LA) were greatly improved by a maximum of 2.5-, 1.6-, and 1.1-fold, respectively, under conditions of N or P deprivation compared with N and P sufficiency. In contrast, levels of EPA or ARA were not enhanced under N or P stress conditions. Additionally, the results showed that N deprivation weakened the impact of P deficiency on the content and proportions of LA and EPA, while P deprivation enhanced the impact of N starvation on the content and proportions of LA and EPA. The conditions of N sufficiency and P deprivation (N+P−) were the optimal conditions for the production of LA, while the optimal conditions for EPA, ARA, and TFAs production were N sufficiency and P limitation (N+P−lim). This study suggests the potential application of combining N removal from saline wastewater with the production of LA, ARA, EPA, and biodiesel.
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The authors would like to acknowledge the financial support of the Collaborative Innovation Center of Suzhou Nano Science and Technology, the Programme for Changjiang Scholars and Innovative Research Team in University, and the Fundamental Research Funds for the Central Universities.
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Hao Hu and Hou-Feng Wang contributed to the work equally and should be regarded as co-first authors
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Hu, H., Wang, HF., Ma, LL. et al. Effects of nitrogen and phosphorous stress on the formation of high value LC-PUFAs in Porphyridium cruentum. Appl Microbiol Biotechnol 102, 5763–5773 (2018). https://doi.org/10.1007/s00253-018-8943-3
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DOI: https://doi.org/10.1007/s00253-018-8943-3