title: Sufficient utilization of natural fluctuating light intensity is an effective approach of promoting lipid productivity in oleaginous microalgal cultivation outdoors.
abstract: The effects of fluctuating intensity of solar radiation on biomass and lipid in oleaginous microalgae are important. However, this topic has not been the subject of studies for a long time. In this study, four oleaginous microalgae from semi-arid areas were screened and cultivated outdoors under different fluctuating intensities. Results showed that the highest lipid productivities and neutral lipid (NL) contents occurred under high fluctuating intensity (HFI), in which 13-20% of the increased NL came from glycolipid transformation without phospholipid conversion. Chlorella sp. L1 and Monoraphidium dybowskii Y2 obtained from biological soil crusts in desert had the largest biomass (137.13, 106.61mgL(-1)d(-1)) and lipid yields (35.06, 32.45mgL(-1)d(-1)) under HFI. The highest areal lipid productivities of 9.06 and 8.95gm(-2)d(-1) and better biodiesel quality were observed under HFI. Accordingly, sufficiently adopting fluctuating light intensity outdoors to culture microalgae was an economic and effective approach.
authors.affiliation: Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Qiaoning
authors.initials: Q
authors.lastname: He
authors.affiliation: Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Haijian
authors.initials: H
authors.lastname: Yang
authors.affiliation: Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Liangliang
authors.initials: L
authors.lastname: Xu
authors.affiliation: Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Xia
authors.affiliation: Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China. Electronic address: cxhu@ihb.ac.cn.
authors.forename: Chunxiang
authors.initials: C
authors.lastname: Hu
mesh_terms: D001709:Biotechnology / Q000379:methods; D005227:Fatty Acids / Q000032:analysis; D008027:Light; D050356:Lipid Metabolism; D008055:Lipids / Q000032:analysis; D058086:Microalgae / Q000254:growth & development* / Q000378:metabolism*; D014508:Urea / Q000378:metabolism
chemical_list: D005227:Fatty Acids; D008055:Lipids; D014508:Urea
keywords: Fluctuating light intensity; Glycolipid; Lipid productivity; Microalgae; Neutral lipid