ArticlePlant physiology2021
Phylloquinone is the principal Mehler reaction site within photosystem I in high light.
Article in Plant physiology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers.
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Who cites it
23 citing papers in PubMed, 52 citations in OpenAlex.
- Vitamin K in photosynthetic organisms.Planta · 2026Review
- Emerging concepts of reactive oxygen species functions in plants.Biochemical Society transactions · 2026Review
- The cryo-EM structure of Photosystem I from Chromera velia with a bound superoxide dismutase heterodimer.Nature communications · 2025Article
- Donor- and Acceptor-Side Protection Against Photosystem I Photoinhibition inInternational journal of molecular sciences · 2025Article
- The commonly used electron donor 2,6-dichlorophenolindophenol also serves as an efficient electron acceptor for Photosystem I.Photosynthesis research · 2025Article
- Photoinhibition and protection of photosystem I.Plant & cell physiology · 2025Review
- Review
- Light intensity and photoperiod interact to alter the phytonutrient profile and light-use efficiency of mizuna grown for the space diet.Scientific reports · 2025Article
- Article
- Adaptive responses of plants to light stress: mechanisms of photoprotection and acclimation. A review.Frontiers in plant science · 2025Review
- Diatoms exhibit dynamic chloroplast calcium signals in response to high light and oxidative stress.Plant physiology · 2024Article
- Pathways of Oxygen-Dependent Oxidation of the Plastoquinone Pool in the Dark After Illumination.Plants (Basel, Switzerland) · 2024Article
- Photosynthetic control at the cytochrome b6f complex.The Plant cell · 2024Review
- Regulation of Microalgal Photosynthetic Electron Transfer.Plants (Basel, Switzerland) · 2024Review
- Nanobiotechnology-mediated regulation of reactive oxygen species homeostasis under heat and drought stress in plants.Frontiers in plant science · 2024Review
- Evaluating the Oxidation Rate of Reduced Ferredoxin inInternational journal of molecular sciences · 2023Article
- Restricting electron flow at cytochrome b6f when downstream electron acceptors are severely limited.Plant physiology · 2023Article
- Higher Reduced State of Fe/S-Signals, with the Suppressed Oxidation of P700, Causes PSI Inactivation inAntioxidants (Basel, Switzerland) · 2022Article
- ROS production and signalling in chloroplasts: cornerstones and evolving concepts.The Plant journal : for cell and molecular biology · 2022Review
- Cooperative pathway of OBiophysical reviews · 2022Review
Corrections and comments
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Authors and funding
7 authors at 4 institutions in 3 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Photosynthesis is a vital process, responsible for fixing carbon dioxide, and producing most of the organic matter on the planet. However, photosynthesis has some inherent limitations in utilizing solar energy, and a part of the energy absorbed is lost in the reduction of O2 to produce the superoxide radical (O2•-) via the Mehler reaction, which occurs principally within photosystem I (PSI). For decades, O2 reduction within PSI was assumed to take place solely in the distal iron-sulfur clusters rather than within the two asymmetrical cofactor branches. Here, we demonstrate that under high irradiance, O2 photoreduction by PSI primarily takes place at the phylloquinone of one of the branches (the A-branch). This conclusion derives from the light dependency of the O2 photoreduction rate constant in fully mature wild-type PSI from Chlamydomonas reinhardtii, complexes lacking iron-sulfur clusters, and a mutant PSI, in which phyllosemiquinone at the A-branch has a significantly longer lifetime. We suggest that the Mehler reaction at the phylloquinone site serves as a release valve under conditions where both the iron-sulfur clusters of PSI and the mobile ferredoxin pool are highly reduced.
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