Cited by 47Photosynthetic Processes and MechanismsSpectroscopy and Quantum Chemical StudiesPhotochemistry and Electron Transfer Studies

Energy-dependent quenching adjusts the excitation diffusion length to regulate photosynthetic light harvesting

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Bennett, Doran I. G., Fleming, Graham R., Amarnath, Kapil·2018·Proceedings of the National Academy of Sciences

Abstract

Significance: Plants’ photosynthetic mechanism adjusts to fluctuations in light intensity. Intermittent bright sunlight can damage light-harvesting proteins; to preempt this, plants dissipate excess absorbed excitation energy as heat. Energy-dependent quenching (qE) of excitations occurs on the seconds to minutes timescale through conformational changes in antenna proteins. Using a multiscale model of photosystem II, we show that changes in light harvesting due to qE can be explained using a single parameter, the excitation diffusion length, which decreases as qE activates. These findings have implications for the interpretation of pulse amplitude-modulated fluorescence, a common noninvasive measurement of photosynthetic activity in leaves.

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Crossref · 10.1073/pnas.1806597115

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  • The 2D tryptophan photoexcitation diffusion length of 6.64 nm is surprisingly high in microtubules given their structural roles and the chlorophyll a equivalent value of 20-80 nm.

    “The two-dimensional tryptophan photoexcitation diffusion length of 6.64 nm is surprisingly high in microtubules, given that they are optimized to play structural roles in the cell and that the equivalent value for chlorophyll a, which is optimized for electronic energy transfer, is only 20–80 nm.”

    From Electronic energy migration in microtubules (2023) · cites this paper as [24]

  • The 2D diffusion length in microtubules is comparable to that observed in some photosynthetic complexes and organic photovoltaic devices.

    “Stern–Volmer analysis revealed that the 2D diffusion length of tryptophan photoexcitation in microtubules is comparable to that observed in some photosynthetic complexes23−25 and organic photovoltaic devices.45−47”

    From Electronic energy migration in microtubules (2023) · cites this paper as [24]

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  1. [20]Joliot A Joliot P 1964 Etude cinetique de la reaction photochimique liberant loxygene au cours de la photosynthese Comptes Rendus Hebdomadaires Des Seances De L Academie Des Sci 258 4622 4625 14146826

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Authors
Bennett, D. I. G., Fleming, G. R., & Amarnath, K.
Affiliations
  • Harvard University (US)
  • Lawrence Berkeley National Laboratory (US)
Corresponding author
  • Bennett, Doran I. G.
  • Fleming, Graham R.
  • Amarnath, Kapil
Venue
Proceedings of the National Academy of Sciences
Published
2018-09-20
Volume
115
Issue
41
Pages
E9523-E9531
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2795640187
Cited by
47
References
61
Citations by year
2026: 5 · 2025: 5 · 2024: 5 · 2023: 6 · 2022: 6 · 2021: 8 · 2020: 2 · 2019: 10
FWCI
1.78
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • U.S. Department of Energy (DE-SC0001088, DE-AC02-05CH11231, DEAC03-76SF000098)
  • Canadian Institute for Advanced Research (BioInspired Solar Energy Program)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Spectroscopy and Quantum Chemical Studies
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
Keywords
energy-dependent quenching, photosystem II, photosynthetic light harvesting, excitation energy transfer, random walks, crop yield
MeSH terms
Light, Models, Chemical, Light-Harvesting Protein Complexes

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