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Furukawa R, Aso M, Fujita T, Akimoto S, Tanaka R, Tanaka A, Yokono M, Takabayashi A. Formation of a PSI-PSII megacomplex containing LHCSR and PsbS in the moss Physcomitrella patens. JOURNAL OF PLANT RESEARCH 2019; 132:867-880. [PMID: 31541373 DOI: 10.1007/s10265-019-01138-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 09/08/2019] [Indexed: 05/10/2023]
Abstract
Mosses are one of the earliest land plants that diverged from fresh-water green algae. They are considered to have acquired a higher capacity for thermal energy dissipation to cope with dynamically changing solar irradiance by utilizing both the "algal-type" light-harvesting complex stress-related (LHCSR)-dependent and the "plant-type" PsbS-dependent mechanisms. It is hypothesized that the formation of photosystem (PS) I and II megacomplex is another mechanism to protect photosynthetic machinery from strong irradiance. Herein, we describe the analysis of the PSI-PSII megacomplex from the model moss, Physcomitrella patens, which was resolved using large-pore clear-native polyacrylamide gel electrophoresis (lpCN-PAGE). The similarity in the migration distance of the Physcomitrella PSI-PSII megacomplex to the Arabidopsis megacomplex shown during lpCN-PAGE suggested that the Physcomitrella PSI-PSII and Arabidopsis megacomplexes have similar structures. Time-resolved chlorophyll fluorescence measurements show that excitation energy was rapidly and efficiently transferred from PSII to PSI, providing evidence of an ordered association of the two photosystems. We also found that LHCSR and PsbS co-migrated with the Physcomitrella PSI-PSII megacomplex. The megacomplex showed pH-dependent chlorophyll fluorescence quenching, which may have been induced by LHCSR and/or PsbS proteins with the collaboration of zeaxanthin. We discuss the mechanism that regulates the energy distribution balance between two photosystems in Physcomitrella.
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Affiliation(s)
- Ryo Furukawa
- Institute of Low-Temperature Science, Hokkaido University, N19 W8 Kita-ku, Sapporo, 060-0819, Japan
| | - Michiki Aso
- Institute of Low-Temperature Science, Hokkaido University, N19 W8 Kita-ku, Sapporo, 060-0819, Japan
| | - Tomomichi Fujita
- Faculty of Science, Hokkaido University, N10 W8 Kita-ku, Sapporo, 060-0810, Japan
| | - Seiji Akimoto
- Graduate School of Science, Kobe University, Kobe, 657-8501, Japan
| | - Ryouichi Tanaka
- Institute of Low-Temperature Science, Hokkaido University, N19 W8 Kita-ku, Sapporo, 060-0819, Japan
| | - Ayumi Tanaka
- Institute of Low-Temperature Science, Hokkaido University, N19 W8 Kita-ku, Sapporo, 060-0819, Japan
| | - Makio Yokono
- Institute of Low-Temperature Science, Hokkaido University, N19 W8 Kita-ku, Sapporo, 060-0819, Japan.
- Innovation Center, Nippon Flour Mills Co., Ltd., Atsugi, 243-0041, Japan.
| | - Atsushi Takabayashi
- Institute of Low-Temperature Science, Hokkaido University, N19 W8 Kita-ku, Sapporo, 060-0819, Japan
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