Red light variation an effective alternative to regulate biomass and lipid profiles in Phaeodactylum tricornutum

Sharma, Nikunj, Fleurent, Gabriel, Awwad, Fatima, Cheng, Michael, Meddeb-Mouelhi, Fatma, Budge, Suzanne M., Germain, Hugo et Desgagné-Penix, Isabel (2020). Red light variation an effective alternative to regulate biomass and lipid profiles in Phaeodactylum tricornutum. Applied Sciences, 10 (7). p. 2531. ISSN 2076-3417 DOI 10.3390/app10072531

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Résumé

Abstract:
Marine water diatom Phaeodactylum tricornutum is a photosynthetic organism that is known to respond to the changing light environment and adapt to different temperatures to prevent photoinhibition and maintain its metabolic functions. The objective of the present study was to test whether light shift variations in different growth phases impact the growth and lipid metabolism of P. tricornutum. Thus, we investigated R exposure in different growth phases to find the most effective light shift condition. The results showed that substituting white light (W) by red light (R) under autotrophic conditions, a condition called red shift (RS), increased biomass and lipid content compared to levels found under continuous W or R exposure alone. We observed an increase by 2-fold biomass and 2.3-fold lipid content in RS as compared to W. No significant change was observed in the morphology of lipid droplets, but the fatty acid (FA) composition was altered. Specifically, polyunsaturated FAs were increased, whereas monounsaturated FAs decreased in P. tricornutum grown in RS compared to W control. Therefore, we propose that a light shift during the beginning of the stationary phase is a low-cost cultivation strategy to boost the total biomass and lipids in P. tricornutum.

Type de document:	Article
Mots-clés libres:	light shift Phaeodactylum tricornutum biomass microalgae lipids autotrophy metabolites
Date de dépôt:	06 mai 2020 21:38
Dernière modification:	06 mai 2020 21:38
Version du document déposé:	Version officielle de l'éditeur
URI:	https://depot-e.uqtr.ca/id/eprint/9206

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