Multiscale model of light harvesting by photosystem II in plants
Abstract
The first step of photosynthesis in plants is the absorption of sunlight by pigments in the antenna complexes of photosystem II (PSII), followed by transfer of the nascent excitation energy to the reaction centers, where long-term storage as chemical energy is initiated. Quantum mechanical mechanisms must be invoked to explain the transport of excitation within individual antenna. However, it is unclear how these mechanisms influence transfer across assemblies of antenna and thus the photochemical yield at reaction centers in the functional thylakoid membrane. In this paper, we model light harvesting at the several-hundred-nanometer scale of the PSII membrane, while preserving the dominant quantum effects previously observed in individual complexes. We show that excitation moves diffusively through the antenna with a diffusion length of 50 nm until it reaches a reaction center, where charge separation serves as an energetic trap. The diffusion length is a single parameter that incorporates the enhancing effect of excited state delocalization on individual rates of energy transfer as well as the complex kinetics that arise due to energy transfer and loss by decay to the ground state. The diffusion length determines PSII’s high quantum efficiency in ideal conditions, as well as how it is altered bymore »
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1236658
- Alternate Identifier(s):
- OSTI ID: 1414744
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Published Article
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 113 Journal Issue: 5; Journal ID: ISSN 0027-8424
- Publisher:
- National Academy of Sciences, Washington, DC (United States)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; excitation energy transfer; quantum coherence; structure-function relationships; photosynthesis; fluorescence lifetime
Citation Formats
Amarnath, Kapil, Bennett, Doran I. G., Schneider, Anna R., and Fleming, Graham R. Multiscale model of light harvesting by photosystem II in plants. United States: N. p., 2016.
Web. doi:10.1073/pnas.1524999113.
Amarnath, Kapil, Bennett, Doran I. G., Schneider, Anna R., & Fleming, Graham R. Multiscale model of light harvesting by photosystem II in plants. United States. https://doi.org/10.1073/pnas.1524999113
Amarnath, Kapil, Bennett, Doran I. G., Schneider, Anna R., and Fleming, Graham R. Tue .
"Multiscale model of light harvesting by photosystem II in plants". United States. https://doi.org/10.1073/pnas.1524999113.
@article{osti_1236658,
title = {Multiscale model of light harvesting by photosystem II in plants},
author = {Amarnath, Kapil and Bennett, Doran I. G. and Schneider, Anna R. and Fleming, Graham R.},
abstractNote = {The first step of photosynthesis in plants is the absorption of sunlight by pigments in the antenna complexes of photosystem II (PSII), followed by transfer of the nascent excitation energy to the reaction centers, where long-term storage as chemical energy is initiated. Quantum mechanical mechanisms must be invoked to explain the transport of excitation within individual antenna. However, it is unclear how these mechanisms influence transfer across assemblies of antenna and thus the photochemical yield at reaction centers in the functional thylakoid membrane. In this paper, we model light harvesting at the several-hundred-nanometer scale of the PSII membrane, while preserving the dominant quantum effects previously observed in individual complexes. We show that excitation moves diffusively through the antenna with a diffusion length of 50 nm until it reaches a reaction center, where charge separation serves as an energetic trap. The diffusion length is a single parameter that incorporates the enhancing effect of excited state delocalization on individual rates of energy transfer as well as the complex kinetics that arise due to energy transfer and loss by decay to the ground state. The diffusion length determines PSII’s high quantum efficiency in ideal conditions, as well as how it is altered by the membrane morphology and the closure of reaction centers. Finally, we anticipate that the model will be useful in resolving the nonphotochemical quenching mechanisms that PSII employs in conditions of high light stress.},
doi = {10.1073/pnas.1524999113},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 5,
volume = 113,
place = {United States},
year = {Tue Jan 19 00:00:00 EST 2016},
month = {Tue Jan 19 00:00:00 EST 2016}
}
https://doi.org/10.1073/pnas.1524999113
Web of Science
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