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1. The diatom Phaeodactylum tricornutum adjusts NPQ capacity in response to dynamic light via fine-tuned Lhcx and xanthophyll cycle pigment synthesis

Author

Lepetit, Bernard, Gélin, Gautier, Lepetit, Mariana, Sturm, Sabine, Vugrinec, Sascha, Rogato, Alessandra, Kroth, Peter, Falciatore, Angela, Lavaud, Johann, Fachbereich Biologie [Konstanz], University of Konstanz, Stazione Zoologica Anton Dohrn (SZN), Biologie Computationnelle et Quantitative = Laboratory of Computational and Quantitative Biology (LCQB), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Biologie Paris Seine (IBPS), Sorbonne Université (SU)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Takuvik Joint International Laboratory ULAVAL-CNRS, Université Laval [Québec] (ULaval)-Centre National de la Recherche Scientifique (CNRS), LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs), and Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDV]Life Sciences [q-bio], [SDE]Environmental Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

2. The diatom Phaeodactylum tricornutum adjusts nonphotochemical fluorescence quenching capacity in response to dynamic light via fine-tuned Lhcx and xanthophyll cycle pigment synthesis.

Author

Lepetit, Bernard, Gélin, Gautier, Lepetit, Mariana, Sturm, Sabine, Vugrinec, Sascha, Rogato, Alessandra, Kroth, Peter G., Falciatore, Angela, and Lavaud, Johann

Subjects
DIATOMS, PHAEODACTYLUM tricornutum, NAVICULALES, FLUORESCENCE quenching, XANTHOPHYLLS, CAROTENES
Abstract

Diatoms contain a highly flexible capacity to dissipate excessively absorbed light by nonphotochemical fluorescence quenching ( NPQ) based on the light-induced conversion of diadinoxanthin (Dd) into diatoxanthin (Dt) and the presence of Lhcx proteins. Their NPQ fine regulation on the molecular level upon a shift to dynamic light conditions is unknown., We investigated the regulation of Dd + Dt amount, Lhcx gene and protein synthesis and NPQ capacity in the diatom Phaeodactylum tricornutum after a change from continuous low light to 3 d of sine ( SL) or fluctuating ( FL) light conditions. Four P. tricornutum strains with different NPQ capacities due to different expression of Lhcx1 were included., All strains responded to dynamic light comparably, independently of initial NPQ capacity. During SL, NPQ capacity was strongly enhanced due to a gradual increase of Lhcx2 and Dd + Dt amount. During FL, cells enhanced their NPQ capacity on the first day due to increased Dd + Dt, Lhcx2 and Lhcx3; already by the second day light acclimation was accomplished. While quenching efficiency of Dt was strongly lowered during SL conditions, it remained high throughout the whole FL exposure., Our results highlight a more balanced and cost-effective photoacclimation strategy of P. tricornutum under FL than under SL conditions. [ABSTRACT FROM AUTHOR]

Published
2017
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