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Photosynthetic Light Reactions in Diatoms. II. The Dynamic Regulation of the Various Light Reactions

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The Molecular Life of Diatoms

Abstract

Photosynthesis in diatoms is performed using the same basic modules as cyanobacteria and plants. It can be regulated on multiple levels depending on the environmental cues, allowing diatoms to adjust their photosynthetic light reaction toward optimum while at the same time minimizing photodamage induced by light. In recent years, tremendous progress has been gained in understanding these acclimation processes, revealing several diatom-specific features. In this chapter, we trace several paths through the photosynthetic electron transport chain to optimize photosynthesis. We review how diatoms repair photoinactivated reaction centers and which mechanisms they have to pre-empt photodamage. Finally, photoprotection is set in an ecophysiological context, highlighting differences in photoprotection of diatoms from different habitats.

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Abbreviations

1O2:

singlet oxygen

3Chl:

triplet chlorophyll a

AEF:

alternative electrons flow

AOX:

alternative oxidase

ATP:

adenosine triphosphate

C. meneghiniana :

Cyclotella meneghiniana

CCMs:

carbon-concentrating mechanisms

CEF:

cyclic electron flow

Chl:

chlorophyll

cyt b6f:

cytochrome b6f complex

Dd:

diadinoxanthin

DES:

de-epoxidation state

Dt:

diatoxanthin

ECS:

electrochromic shift

ETR:

electron transport rate

FCP:

fucoxanthin-chlorophyll-binding protein complex

Fd:

ferredoxin

Flv:

flavodiiron

FNR:

ferredoxin-NADP+ reductase

H2O2:

hydrogen peroxide

LEF:

linear electron flow

LHC:

light-harvesting complex

NADP+/NADPH:

nicotinamide adenine dinucleotide phosphate

NDH:

NADPH dehydrogenase

NPQ:

Non-Photochemical fluorescence Quenching

NPQs:

sustained NPQ

P. tricornutum :

Phaeodactylum tricornutum

P680:

special chlorophyll pair in the PSII core

P700:

special chlorophyll pair in the PSI core

pmf:

proton motive force

PQ:

plastoquinone

PSI:

photosystem I

PSII:

photosystem II

PTOX:

plastid terminal oxidase

qE:

energy-dependent quenching

qI:

photoinhibitory quenching

qT:

quenching based on state transitions

qZ:

quenching based on conversion of violaxanthin via antheraxanthin to zeaxanthin

ROS:

reactive oxygen species

SOD:

superoxide dismutase

T. pseudonana :

Thalassiosira pseudonana

WWC:

water-to-water cycle

ΔpH:

osmotic component of the pmf

Δψ:

electric component of the pmf

σPSII:

functional absorption cross section of PSII

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Acknowledgments

BB acknowledges financial support from the European Research Council (ERC) under the European Union Horizon 2020 research and innovation program (grant agreement no. 715579). BL thanks the Deutsche Forschungsgemeinschaft (LE3358/3-2) and the Baden-Württemberg Stiftung (Elite program) for financial support, and Kerstin Flieger (University of Leipzig) for analyzing α-tocopherol. CB acknowledges support by the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No 675006 and from the Deutsche Forschungsgemeinschaft, grant Bu 812 10-1. DAC thanks the Canada Research Chairs and Natural Science and Engineering Research Council of Canada for support. JL thanks the Centre National de la Recherche Scientifique-CNRS, the Natural Sciences and Engineering Research Council of Canada-NSERC (Discovery and Northern Supplement grants), the Canada First Research Excellence Fund-Sentinelle Nord, and the strategic research cluster Québec-Océan for their financial support. All authors thank the reviewer for valuable suggestions.

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Correspondence to Bernard Lepetit , Douglas A. Campbell , Johann Lavaud or Benjamin Bailleul .

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Lepetit, B., Campbell, D.A., Lavaud, J., Büchel, C., Goss, R., Bailleul, B. (2022). Photosynthetic Light Reactions in Diatoms. II. The Dynamic Regulation of the Various Light Reactions. In: Falciatore, A., Mock, T. (eds) The Molecular Life of Diatoms. Springer, Cham. https://doi.org/10.1007/978-3-030-92499-7_16

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