Proton Gradient Regulation 5 is required to avoid photosynthetic oscillations during light transitions

© The Author(s) 2023. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For permissions, please email: journals.permissionsoup.com.

Bibliographische Detailangaben
Veröffentlicht in:Journal of experimental botany. - 1985. - 75(2024), 3 vom: 02. Feb., Seite 947-961
1. Verfasser: Degen, Gustaf E (VerfasserIn)
Weitere Verfasser: Pastorelli, Federica, Johnson, Matthew P
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2024
Zugriff auf das übergeordnete Werk:Journal of experimental botany
Schlagworte:Journal Article Research Support, Non-U.S. Gov't ATP synthase CO2 fixation cyclic electron transfer electron transport oscillation photosynthesis photosynthetic control Protons mehr... Arabidopsis Proteins Carbon Dioxide 142M471B3J NADP 53-59-8 Photosystem I Protein Complex Adenosine Triphosphate 8L70Q75FXE PGR5 protein, Arabidopsis Photosynthetic Reaction Center Complex Proteins
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520 |a The production of ATP and NADPH by the light reactions of photosynthesis and their consumption by the Calvin-Benson-Bassham (CBB) cycle and other downstream metabolic reactions requires careful regulation. Environmental shifts perturb this balance, leading to photo-oxidative stress and losses in CO2 assimilation. Imbalances in the production and consumption of ATP and NADPH manifest themselves as transient instability in the chlorophyll fluorescence, P700, electrochromic shift, and CO2 uptake signals recorded on leaves. These oscillations can be induced in wild-type plants by sudden shifts in CO2 concentration or light intensity; however, mutants exhibiting increased oscillatory behaviour have yet to be reported. This has precluded an understanding of the regulatory mechanisms employed by plants to suppress oscillations. Here we show that the Arabidopsis pgr5 mutant, which is deficient in Proton Gradient Regulation 5 (PGR5)-dependent cyclic electron transfer (CET), exhibits increased oscillatory behaviour. In contrast, mutants lacking the NADH-dehydrogenase-like-dependent CET are largely unaffected. The absence of oscillations in the hope2 mutant which, like pgr5, lacks photosynthetic control and exhibits high ATP synthase conductivity, ruled out loss of these photoprotective mechanisms as causes. Instead, we observed slower formation of the proton motive force and, by inference, ATP synthesis in pgr5 following environmental perturbation, leading to the transient reduction of the electron transfer chain and photosynthetic oscillations. PGR5-dependent CET therefore plays a major role in damping the effect of environmental perturbations on photosynthesis to avoid losses in CO2 fixation 
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650 4 |a Research Support, Non-U.S. Gov't 
650 4 |a ATP synthase 
650 4 |a CO2 fixation 
650 4 |a cyclic electron transfer 
650 4 |a electron transport 
650 4 |a oscillation 
650 4 |a photosynthesis 
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650 7 |a Adenosine Triphosphate  |2 NLM 
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650 7 |a PGR5 protein, Arabidopsis  |2 NLM 
650 7 |a Photosynthetic Reaction Center Complex Proteins  |2 NLM 
700 1 |a Pastorelli, Federica  |e verfasserin  |4 aut 
700 1 |a Johnson, Matthew P  |e verfasserin  |4 aut 
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