Improvement in lipid production in Monoraphidium sp. QLY-1 by combining fulvic acid treatment and salinity stress. (December 2019)

• Record Type: Journal Article
• Authors: Li, Ximing; Li, Xingyu; Han, Benyong; Zhao, Yongteng; Li, Tao; Zhao, Peng; Yu, Xuya
• Is Part Of: Bioresource technology. Volume 294(2019)
• Publication Date: 2019-12
• Subjects: Fulvic acid -- Lipid production -- Microalgae -- Mitogen-activated protein kinase -- Salinity stress; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.122179
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Fulvic acid significantly increased the lipid content in algae under salt stress. Coupling of NaCl and fulvic acid upregulated lipogenic gene levels. Fulvic acid mediated oxidative stress by upregulating antioxidase activities. Fulvic acid enhanced lipid biosynthesis by modulating signalling molecule levels. Abstract: The effects of the combined treatment of fulvic acid (FA) and salinity stress on lipid production in Monoraphidium sp. QLY-1 at multiple levels was investigated in this study. The results indicated that the highest lipid content (59.53%) in QLY-1 was achieved by combining FA treatment and salinity stress. Compared with the control group and FA addition alone, the group treated with both FA and salinity stress had increased contents of reactive oxygen species (ROS), antioxidases, and nitric oxide (NO). Additionally, the addition of FA enhanced the expression levels of mitogen-activated protein kinases (MAPKs) and key genes related to lipid biosynthesis in QLY-1 under salinity stress. Collectively, biochemical analyses indicated that ROS, NO, MAPK, expression of lipid biosynthesis-related genes and antioxidant systems were involved in the lipid biosynthesis pathways of QLY-1 under the combined treatment of FA and salinity stress.