ArticleFrontiers in plant science2015
Electron flow from PSII to PSI under high light is controlled by PGR5 but not by PSBS.
Article in Frontiers in plant science, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 65 papers.
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Who cites it
65 citing papers in PubMed, 117 citations in OpenAlex.
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- Nitric Oxide Alleviates Low-Light-Induced Photosynthetic Impairment by Improving Photosystem Coordination and Electron Transport in Tomato Seedlings.Plants (Basel, Switzerland) · 2026Article
- Photo-Oxidative Stress in Plants: ROS Signaling, Damage Propagation, and Systems-Level Resilience.Antioxidants (Basel, Switzerland) · 2026Review
- Proton motive force partitioning links energy and redox balance to photoprotection and carbon gain.Frontiers in plant science · 2026Review
- Photoinhibition and protection of photosystem I.Plant & cell physiology · 2025Review
- Jasmonic acid signaling and glutathione coordinate plant recovery from high light stress.Plant physiology · 2025Article
- Differential FeS cluster photodamage plays a critical role in regulating excess electron flow through photosystem I.Nature plants · 2024Article
- Photosynthesis: Genetic Strategies Adopted to Gain Higher Efficiency.International journal of molecular sciences · 2024Review
- Characterizing compensatory mechanisms in the absence of photoprotective qE in Chlamydomonas reinhardtii.Photosynthesis research · 2023Article
- Restricting electron flow at cytochrome b6f when downstream electron acceptors are severely limited.Plant physiology · 2023Article
- The Protective Effect of Exogenous Ascorbic Acid on Photosystem Inhibition of Tomato Seedlings Induced by Salt Stress.Plants (Basel, Switzerland) · 2023Article
- Long-Term Alleviation of the Functional Phenotype in Chlorophyll-Deficient Wheat and Impact on Productivity: A Semi-Field Phenotyping Experiment.Plants (Basel, Switzerland) · 2023Article
- FZL, a dynamin-like protein localized to curved grana edges, is required for efficient photosynthetic electron transfer inFrontiers in plant science · 2023Article
- Photosystems under high light stress: throwing light on mechanism and adaptation.Photosynthetica · 2023Review
- Higher Reduced State of Fe/S-Signals, with the Suppressed Oxidation of P700, Causes PSI Inactivation inAntioxidants (Basel, Switzerland) · 2022Article
- The Role of Alternative Electron Pathways for Effectiveness of Photosynthetic Performance ofPlants (Basel, Switzerland) · 2022Article
- Determining photosynthetic control, a probe for the balance between electron transport and Calvin-Benson cycle activity, with the DUAL-KLAS-NIR.Photosynthesis research · 2022Article
- The difficulty of estimating the electron transport rate at photosystem I.Journal of plant research · 2022Article
- Protection of photosystem I during sudden light stress depends on ferredoxin:NADP(H) reductase abundance and interactions.Plant physiology · 2022Article
- Responses of photosystem to long-term light stress in a typically shade-tolerant speciesFrontiers in plant science · 2022Article
5 more citing papers are in PubMed but not listed here.
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Absence of the Proton Gradient Regulation 5 (PGR5) protein from plant chloroplasts prevents the induction of strong trans-thylakoid proton gradient (ΔpH) and consequently also the thermal dissipation of excess energy (NPQ). The absence of the PSBS protein likewise prevents the formation of ΔpH-dependent NPQ. This component of NPQ is called qE, which is nearly exclusively responsible for induction of NPQ upon increase in light intensity. On the other hand, the pgr5 mutant is not only deficient in induction of strong NPQ but it also lacks the capability to oxidize P700 upon increase in light intensity. This, in turn, results from uncontrolled electron flow toward photosystem I (PSI), which has been proposed to be caused by the lack of PSII down-regulation by NPQ and by a poor control of electron flow via the Cytochrome b6f (Cyt b6f) complex. Here we asked whether NPQ really is a component of such regulation of electron flow from PSII to PSI at high light. To this end, the two NPQ mutants pgr5 and npq4, the latter lacking the PSBS protein, were characterized. It is shown that the npq4 mutant, despite its highly reduced Plastoquinone pool, does not inhibit but rather enhances the oxidation of P700 in high light as compared to wild type. This clearly demonstrates that the control of electron flow from PSII to PSI cannot be assigned, even partially, to the down-regulation of PSII by NPQ but apparently takes place solely in Cyt b6f. Moreover, it is shown that the pgr5 mutant can induce NPQ in very high light, but still remains deficient in P700 oxidation. These results challenge the suggestion that NPQ, induced by PGR5-dependent cyclic electron transfer, would have a key role in regulation of electron transfer from PSII to PSI. Instead, the results presented here are in line with our recent suggestion that both PSII and PSI function under the same light harvesting machinery regulated by ΔpH and the PSBS protein (Tikkanen and Aro, 2014; Grieco et al., 2015).
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