Data/hora: 10/06/2024 04:58:10

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France

Título:

Réponses physiologiques et biochimiques à une limitation nutritive en phosphore ou en azote sur la réorientation métabolique des lipides polaires chez différentes espèces de microalgues marines

Physiological and biochemical responses to a phosphorus or nitrogen limitation on the metabolic reorientation of polar lipids in different marine microalgal species.

Autores: | Huang, Bing.
Data: | 2018-11-28
Ano: | 2018
Palavras-chave: | Microalgues marines; Bétaïne lipides; Triacylglycérols; Limitation en phosphore; Lipides polaires; Acides gras oméga-3; Marine microalgae; Betaine lipids; Triacylglycerols; Phosphorus limitation; Polar lipids; Omega- 3 fatty acids.
Resumo: | Betaine lipids (BL) are P-free polar lipids, conversely to phospholipids (PL). The metabolic reorientation induced by phosphorus (P) limitation in microalgae producing BL (Tisochrysis lutea and Diacronema lutheri, Haptophyta) or producing low levels of BL (Phaeodactylum tricornutum, Bacillariophyta) was compared to that induced by nitrogen (N) limitation. The carbon destiny and flow in different biosynthetic pathways were studied with a multidisciplinary approach. P or N limitation differently affected carbon metabolism according to microalgal species. P limitation highly decreased photosynthetic activity and respiration of P. tricornutum and T. lutea. Consequently, carbon accumulation was higher than under N limitation in these two species. Both limitations stimulated the synthesis of neutral lipids and / or carbohydrates. Replacement of PL by BL was observed in P. tricornutum under P limitation. This result is in agreement with a transcription increase of the gene encoding BL synthase. On the other hand, this limitation did not modify BL contents in reference with carbon in T. lutea or D. lutheri. Fatty acid composition of the different lipid classes was modified according to the microalgal species and the limiting nutrient. Particular attention was paid to the fatty acids of the omega-3 series, notably eicosapentaenoic acid (EPA, 20:5 ù3) and docosahexaenoic acid (DHA, 22:6 ù3), the proportions of which vary according to the limiting element, species and lipid class. The increase in the production of neutral lipids and / or polar lipids, especially betaine lipids, rich in DHA and / or EPA induced by nutritive stress suggests a valorization of these molecules of interest in various areas including nutrition and health.
Tipo: | Text
Idioma: | Francês

Identificador:

https://archimer.ifremer.fr/doc/00500/61169/64638.pdf

https://archimer.ifremer.fr/doc/00500/61169/

Editor: | Le Mans Université
Formato: | application/pdf

Fonte:

info:eu-repo/semantics/openAccess

restricted use