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Time-resolved transcriptome analysis of Scenedesmus obliquus HTB1 under 10% CO 2 condition.
- Source :
-
Microbial biotechnology [Microb Biotechnol] 2023 Feb; Vol. 16 (2), pp. 448-462. Date of Electronic Publication: 2022 Aug 01. - Publication Year :
- 2023
-
Abstract
- Certain microalgal species can grow under high CO <subscript>2</subscript> concentrations providing potential for mitigating CO <subscript>2</subscript> pollution in flue gas produced by power plants. Microalga Scenedesmus obliquus strain HTB1 was isolated from the Chesapeake Bay and grow rapidly in a high level of CO <subscript>2</subscript> . However, little is known about the molecular responses of HTB1 to high CO <subscript>2</subscript> levels. Here, we investigated how HTB1 responds to 10% CO <subscript>2</subscript> using the time-resolved transcriptome analysis. Gene expression profiles indicated that HTB1 responds quickly (in 2 h) and becomes adaptive within 12 h when exposed to 10% CO <subscript>2</subscript> . Interestingly, certain genes of light-harvesting, chlorophyll synthesis and carbon fixation (i.e. rbcS) were up-regulated at 10% CO <subscript>2</subscript> , and these functional responses are consistent with the increased photosynthesis efficiency and algal biomass under 10% CO <subscript>2</subscript> . Nitrate assimilation was strongly enhanced, with amino acid biosynthesis and aminoacyl tRNA biosynthesis genes being markedly up-regulated, indicating that HTB1 actively takes up nitrogen and accelerates protein synthesis at 10% CO <subscript>2</subscript> . Carbon metabolism including fatty acid biosynthesis and TCA cycle was enhanced at 10% CO <subscript>2</subscript> , supporting the earlier observation of increased lipid content of Scenedesmus sp. under high CO <subscript>2</subscript> levels. Interestingly, key genes like RuBisCO (rbcL) and carbonic anhydrase in carboxysomes did not respond actively to 10% CO <subscript>2</subscript> , implying that exposure to 10% CO <subscript>2</subscript> has little impact on the carbon concentrating mechanisms and CO <subscript>2</subscript> fixation of the Calvin cycle. It appears that HTB1 can grow rapidly at 10% CO <subscript>2</subscript> without significant metabolic changes in carbon fixation and ATP synthesis.<br /> (© 2022 The Authors. Microbial Biotechnology published by Society for Applied Microbiology and John Wiley & Sons Ltd.)
Details
- Language :
- English
- ISSN :
- 1751-7915
- Volume :
- 16
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Microbial biotechnology
- Publication Type :
- Academic Journal
- Accession number :
- 35914242
- Full Text :
- https://doi.org/10.1111/1751-7915.14100