Polyphosphate during the Regreening of Chlorella vulgaris under Nitrogen Deficiency

International Journal of Molecular Sciences

Fei-Fei Chu¹  Xiao-Fei Shen¹  Paul K. S. Lam¹  Raymond J. Zeng¹ 

[1] Advanced Laboratory for Environmental Research and Technology, USTC-CityU, Suzhou 215123, China; E-Mails:

关键词: Chlorella vulgaris;    regreening;    biodiesel production;    polyphosphates;    nitrogen deficiency;    phosphate supply;   

DOI  :  10.3390/ijms161023355

来源: mdpi

【 摘 要 】

Polyphosphate (Poly-P) accumulation has been reported in Chlorella vulgaris under nitrogen deficiency conditions with sufficient P supply, and the process has been demonstrated to have great impact on lipid productivity. In this article, the utilization of polyphosphates and the regreening process under N resupplying conditions, especially for lipid production reviving, were investigated. This regreening process was completed within approximately 3–5 days. Polyphosphates were first degraded within 3 days in the regreening process, with and without an external P supply, and the degradation preceded the assimilation of phosphate in the media with an external P offering. Nitrate assimilation was markedly influenced by the starvation of P after polyphosphates were exhausted in the medium without external phosphates, and then the reviving process of biomass and lipid production was strictly impeded. It is, thus, reasonable to assume that simultaneous provision of external N and P is essential for overall biodiesel production revival during the regreening process.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.