Abstract
Microalgae can continuously convert carbon dioxide into biofuels as a typical organism of biological carbon fixation. This study investigated the effects of exogenous putrescine on lipid accumulation, algal growth, and transcriptional metabolism of Tetradesmus obliquus. The results showed that the content of neutral lipids increased by 2.26-fold after short-term stress of putrescine, and the total lipids increased to 355.51 mg/g. Furthermore, the transcriptomic analysis reveals that putrescine treatment plays a dramatic role in photosynthetic electron transport, carbon metabolism, and signal transduction pathways, and the purpose of lipid accumulation was achieved by influencing the changes in cell carbon flux and physiological functions. Altogether, this study demonstrates for the first time that putrescine treatment has a positive effect on lipid accumulation through unprecedented regulation of key metabolic nodes and provides theoretical support for the industrial biodiesel production of microalgae.
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