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Title: The PSI–PSII Megacomplex in Green Plants

Journal Article · · Plant and Cell Physiology
DOI:https://doi.org/10.1093/pcp/pcz026· OSTI ID:1581066
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [2]
  1. Hokkaido Univ., Sapporo (Japan). Inst. of Low Temperature Science; Japan Science and Technology Agency (JST), Sapporo (Japan). Core Research for Evolutional Science and Technology; Nippon Flour Mills Co., Ltd., Innovation Center, Atsugi (Japan)
  2. Hokkaido Univ., Sapporo (Japan). Inst. of Low Temperature Science; Japan Science and Technology Agency (JST), Sapporo (Japan). Core Research for Evolutional Science and Technology
  3. Hokkaido Univ., Sapporo (Japan)
  4. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Kobe Univ. Research Centre for Inland Seas, Awaji (Japan); Kobe Univ., Kobe (Japan)
  6. Kobe Univ., Kobe (Japan)

Energy dissipation is crucial for land and shallow-water plants exposed to direct sunlight. Almost all green plants dissipate excess excitation energy to protect the photosystem reaction centers, photosystem II (PSII) and photosystem I (PSI), and continue to grow under strong light. In our previous work, we reported that about half of the photosystem reaction centers form a PSI–PSII megacomplex in Arabidopsis thaliana, and that the excess energy was transferred from PSII to PSI fast. However, the physiological function and structure of the megacomplex remained unclear. Here in this paper, we suggest that high-light adaptable sun-plants accumulate the PSI–PSII megacomplex more than shade-plants. In addition, PSI of sun-plants has a deep trap to receive excitation energy, which is low-energy chlorophylls showing fluorescence maxima longer than 730 nm. This deep trap may increase the high-light tolerance of PSI by improving excitation energy dissipation. Electron micrographs suggest that one PSII dimer is directly sandwiched between two PSIs with 2-fold rotational symmetry in the basic form of the PSI–PSII megacomplex in green plants. This structure should enable fast energy transfer from PSII to PSI and allow energy in PSII to be dissipated via the deep trap in PSI.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Japan Science and Technology Agency; Japan Society for the Promotion of Science (JSPS)
Grant/Contract Number:
AC02-05CH11231; 16H06553
OSTI ID:
1581066
Journal Information:
Plant and Cell Physiology, Vol. 60, Issue 5; ISSN 0032-0781
Publisher:
Japanese Society of Plant PhysiologistsCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (3)

Formation of a PSI–PSII megacomplex containing LHCSR and PsbS in the moss Physcomitrella patens journal September 2019
Effects of excess light energy on excitation-energy dynamics in a pennate diatom Phaeodactylum tricornutum journal April 2019
Adaptation of light-harvesting and energy-transfer processes of a diatom Phaeodactylum tricornutum to different light qualities journal January 2020

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