Mechanism study on the regulation of metabolite flux for producing promising bioactive substances in microalgae Desmodesmus sp.YT through salinity stress

文献类型： 外文期刊

第一作者： Li, Shuangfei

作者： Li, Shuangfei;Chen, Xianglan;Chen, Huirong;Liufu, Guangyu;Yang, Xuewei;Wong, Ming Hung;Tao, Li;Cheng, Jay Jiayang

作者机构：

关键词： Desmodesmus sp; Salt stress; Metabolism variation; Comparative transcriptome

期刊名称：ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS （ 影响因子：5.276； 五年影响因子：5.813 ）

ISSN： 2211-9264

年卷期： 2022 年 64 卷

页码：

收录情况： SCI

摘要： Desmodesmus sp.YT rich in bioactive substances exhibited impressive tolerance to various environmental conditions. To investigate the metabolism transformation influenced by salt stress in Desmodesmus sp.YT, biochemical compositions and comparative transcriptome were thoroughly explored in this research. Results showed that normal treatment (0%o salinity) was beneficial for the production of biomass (up to 1.87 times) and protein (up to 1.46 times), compared with salt treatment. Furthermore, differentially expressed genes analysis revealed that vital genes involved in photosynthesis (light-harvesting complexs, LHCs; photosystem II oxygenevolving enhancer proteins, Psbs), C3 photosynthetic pathway (fructose-bisphosphate aldolase, ALDO; fructose-1,6-bisphosphatase, PFK; phosphoglycerate kinase, PGK) and chlorophyll synthesis (coproporphyrinogen III oxidase, CPOX; porphobilinogen synthase, HemB) were significantly up-regulated in 0%o salinity, leading to enhanced cell growth. Interestingly, salt stress stimulated the expression of cellulose synthase catalytic subunit A2 (CesA2) and starch synthase (GLGA), increasing the biosynthesis of cellulose (up to 3.23 times) and starch (up to 1.05 times). Results showed that Desmodesmus sp.YT cultured at freshwater could be applied as feed additives while microalgae grown in seawater had the potential for biofuel production for further mass cultivation.

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