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The “Algae Physiology and Development Control Research Group†of the Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, takes the marine diatom Phaeodactylum as the research object and finds that under the high-carbon conditions, not only its growth rate is accelerated, but also the oil content is significantly increased. high.
Through physiological and biochemical assays and gene expression analysis, the activity of the oxidized pentose phosphate pathway (OPPP) was found to be significantly upregulated, indicating that P. tricornutum can utilize the NADPH produced by this pathway under high-carbon conditions, and through the elongation of the fatty acid carbon chain. Distribute using the reducing power generated by the cells. The results of the study explain the source of NADPH and its distribution in both during the high-speed growth and rapid accumulation of algae. The paper was published in the recently published Biotechnology for Biofuels (2015, 8:78). Ph.D. Author.
At the same time, the research group is based on the fact that seaweed can use inorganic carbon sources (such as HCO3-, CO2, etc.) for photosynthetic autotrophication and the use of organic carbon sources for both cultivation and heterotrophy, and cooperates with the Shanghai Institute of Life Sciences, Chinese Academy of Sciences, from glycerin, Glucose, glycine, and other organic compounds were used to screen organic carbon sources for growth and utilization of Phaeodactylum tricornutum. Using stable isotope labeling techniques, the metabolic processes and pathways of organic carbon sources in cells were studied.
The results showed that under the condition of organic carbon source, light irradiation can significantly increase the growth rate of Phaeodactylum tricornutum, and its growth rate is positively correlated with light intensity. Through metabolomic analysis, it was found that the photorespiration process is involved in the organic metabolism of Phaeodactylum tricornutum. Related papers were published on Biotechnology for Biofuels (2015, 8:73), and postdoctoral Huang Aiyou was the first author.
The research group also found that the unsaturated fatty acid metabolic pathway of Phaeodactylum tricornutum and its major light-harvesting pigment system, the fucoxanthin-chlorophyll a/c-protein complex (FCP), were affected by silicon and showed a lack of silicon. The relative content of unsaturated fatty acids decreased; although the lack of silicon under normal conditions caused a significant decrease in FCP content, its growth rate was not affected; however, under low temperature and green light conditions, the lack of silicon significantly reduced its growth rate. Therefore, it is believed that silicon plays an important role in the survival of Phaeodactylum tricornutum in deep water. The relevant research papers were published in Scientific Reports (2014, 4: 3958), and Ph.D. candidate Zhao Peipei was the first author.
The above research has been funded by the National Natural Science Foundation of China, the Fundamental Special Project of the Ministry of Science and Technology, and special projects of international science and technology cooperation.
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