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Volume 10
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10.3390/app10072531
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Article

Red Light Variation an Effective Alternative to Regulate Biomass and Lipid Profiles in Phaeodactylum tricornutum

by
Nikunj Sharma
1,
Gabriel Fleurent
1,
Fatima Awwad
1,
Michael Cheng
2,
Fatma Meddeb-Mouelhi
1,3,
Suzanne M. Budge
2,
Hugo Germain
1,3 and
Isabel Desgagné-Penix
1,3,*
1
Department of Chemistry, Biochemistry and Physics, Université du Québec à Trois-Rivières, 3351, boul. des Forges, C.P. 500, Trois-Rivières, QC G9A 5H7, Canada
2
Department of Process Engineering and Applied Science, Dalhousie University, P.O. Box 15000, Halifax, NS H1N 1C1, Canada
3
Groupe de Recherche en Biologie Végétale, Université du Québec à Trois-Rivières, 3351, boul. des Forges, C.P. 500, Trois-Rivières, QC G9A 5H7, Canada
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(7), 2531; https://doi.org/10.3390/app10072531
Submission received: 5 March 2020 / Revised: 1 April 2020 / Accepted: 2 April 2020 / Published: 7 April 2020
(This article belongs to the Special Issue New Trends on Algal Biotechnology for a Circular Economy)
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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.
Keywords: light shift; Phaeodactylum tricornutum; biomass; microalgae; lipids; autotrophy; metabolites light shift; Phaeodactylum tricornutum; biomass; microalgae; lipids; autotrophy; metabolites
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MDPI and ACS Style

Sharma, N.; Fleurent, G.; Awwad, F.; Cheng, M.; Meddeb-Mouelhi, F.; Budge, S.M.; Germain, H.; Desgagné-Penix, I. Red Light Variation an Effective Alternative to Regulate Biomass and Lipid Profiles in Phaeodactylum tricornutum. Appl. Sci. 2020, 10, 2531. https://doi.org/10.3390/app10072531

AMA Style

Sharma N, Fleurent G, Awwad F, Cheng M, Meddeb-Mouelhi F, Budge SM, Germain H, Desgagné-Penix I. Red Light Variation an Effective Alternative to Regulate Biomass and Lipid Profiles in Phaeodactylum tricornutum. Applied Sciences. 2020; 10(7):2531. https://doi.org/10.3390/app10072531

Chicago/Turabian Style

Sharma, Nikunj, Gabriel Fleurent, Fatima Awwad, Michael Cheng, Fatma Meddeb-Mouelhi, Suzanne M. Budge, Hugo Germain, and Isabel Desgagné-Penix. 2020. "Red Light Variation an Effective Alternative to Regulate Biomass and Lipid Profiles in Phaeodactylum tricornutum" Applied Sciences 10, no. 7: 2531. https://doi.org/10.3390/app10072531

APA Style

Sharma, N., Fleurent, G., Awwad, F., Cheng, M., Meddeb-Mouelhi, F., Budge, S. M., Germain, H., & Desgagné-Penix, I. (2020). Red Light Variation an Effective Alternative to Regulate Biomass and Lipid Profiles in Phaeodactylum tricornutum. Applied Sciences, 10(7), 2531. https://doi.org/10.3390/app10072531

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