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  Metabolic stability of freshwater Nitzschia palea strains under silicon stress associated with triacylglycerol accumulation

Machado, M., Vaz, M. G. M. V., Bromke, M. A., Rosa, R. M., Covell, L., de Souza, L. P., et al. (2021). Metabolic stability of freshwater Nitzschia palea strains under silicon stress associated with triacylglycerol accumulation. Algal Research, 60: 102554. doi:10.1016/j.algal.2021.102554.

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Machado, Mariana1, Author
Vaz, Marcelo Gomes Marçal Vieira1, Author
Bromke, M. A.2, Author              
Rosa, Rinamara Martins1, Author
Covell, Lidiane1, Author
de Souza, L. P.3, Author              
Rocha, Diego Ismael1, Author
Martins, Marcio Arêdes1, Author
Araújo, Wagner L.1, Author
Szymański, Jędrzej1, Author
Nunes-Nesi, Adriano1, Author
Affiliations:
1external, ou_persistent22              
2Small Molecules, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753340              
3Central Metabolism, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753339              

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Free keywords: Diatom, Silicon starvation, Metabolite profile, Lipid profile, Microalgae
 Abstract: Si is an essential nutrient for diatom growth. It is involved in frustule formation and is directly linked to the cell cycle. Despite numerous studies analyzing Si starvation in diatoms, the interaction between Si and central metabolism remains poorly understood. Accordingly, we analyzed the metabolite profiles of two freshwater strains of Nitzschia palea, BR006 and BR022 (a fast and a slow-growing strain, respectively), under different Si concentrations (0, 0.25, 1.25, and 5 mM) in different harvesting points. The strains exhibited similar metabolic responses under Si starvation, such as high pigment and total lipid, as well as high primary metabolite accumulation; only ornithine level was low in both strains in the Si-starved condition. However, the response of each strain differed under different Si concentrations. Triacylglycerol (TAG) accumulation in cells was inversely proportional to growth rate. Unlike BR006, slow-growing BR022 cells exhibited high TAG production even under high Si conditions. These results suggest that under optimal Si conditions, in the fast-growing BR006 strain, carbon from photosynthesis is directed toward new cell formation, while in the slow-growing BR022 cells, carbon is stored as TAG as a priority.

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Language(s): eng - English
 Dates: 2021-11-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.algal.2021.102554
 Degree: -

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Title: Algal Research
Source Genre: Journal
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Pages: 102554 Volume / Issue: 60 Sequence Number: 102554 Start / End Page: - Identifier: ISBN: 2211-9264