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Article dans une revue

Carbon Partitioning and Lipid Remodeling During Phosphorus and Nitrogen Starvation in the Marine Microalga Diacronema lutheri (Haptophyta)

Abstract : The domesticated marine microalga Diacronema lutheri is of great interest for producing various highly valuable molecules like lipids, particularly long‐chain polyunsaturated fatty acids (LC‐PUFA). In this study, we investigated the impact of phosphorus (P) and nitrogen (N) starvation on growth, carbon fixation (photosynthetic activity) and partitioning, and membrane lipid remodeling in this alga during batch culture. Our results show that the photosynthetic machinery was similarly affected by P and N stress. Under N starvation, we observed a much lower photosynthetic rate and biomass productivity. The degradation and re‐use of cellular N‐containing compounds contributed to triacylglycerol (TAG) accumulation. On the other hand, P‐starved cells maintained pigment content and a carbon partitioning pattern more similar to the control, ensuring a high biomass. Betaine lipids constitute the major compounds of non‐plastidial membranes, which are rich in eicosapentaenoic (EPA) and docosahexaenoic (DHA) acids. Under P and N starvations, EPA was transferred from the recycling of membrane polar lipids, most likely contributing to TAG accumulation.
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https://hal-univ-lemans.archives-ouvertes.fr/hal-03155185
Contributeur : Virginie Mimouni <>
Soumis le : lundi 1 mars 2021 - 16:05:31
Dernière modification le : mardi 30 mars 2021 - 12:30:03

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Bing Huang, Virginie Mimouni, Ewa Lukomska, Annick Morant-Manceau, Gaël Bougaran. Carbon Partitioning and Lipid Remodeling During Phosphorus and Nitrogen Starvation in the Marine Microalga Diacronema lutheri (Haptophyta). Journal of Phycology, Wiley, 2020, 56 (4), pp.908-922. ⟨10.1111/jpy.12995⟩. ⟨hal-03155185⟩

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