Regulation of Photochemical Energy Transfer Accompanied by Structural Changes in Thylakoid Membranes of Heat-Stressed Wheat
Photosystems of higher plants alleviate heat-induced damage in the presence of light under moderate stressed conditions; however, in the absence of light (i.e., in the dark), the same plants are damaged more easily. (Yamauchi and Kimura, 2011) We demonstrate that regulating photochemical energy tran...
Main Authors: | , , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2014-12-01
|
Series: | International Journal of Molecular Sciences |
Subjects: | |
Online Access: | http://www.mdpi.com/1422-0067/15/12/23042 |
id |
doaj-87b5a5386c63416aa40ca64b4c8d5823 |
---|---|
record_format |
Article |
spelling |
doaj-87b5a5386c63416aa40ca64b4c8d58232020-11-24T22:15:51ZengMDPI AGInternational Journal of Molecular Sciences1422-00672014-12-011512230422305810.3390/ijms151223042ijms151223042Regulation of Photochemical Energy Transfer Accompanied by Structural Changes in Thylakoid Membranes of Heat-Stressed WheatYoko Marutani0Yasuo Yamauchi1Akihito Miyoshi2Kanako Inoue3Ken-ichi Ikeda4Masaharu Mizutani5Yukihiro Sugimoto6Graduate School of Agricultural Science, Kobe University, 657-8501 Kobe, JapanGraduate School of Agricultural Science, Kobe University, 657-8501 Kobe, JapanFaculty of Agriculture, Kobe University, 657-8501 Kobe, JapanGraduate School of Agricultural Science, Kobe University, 657-8501 Kobe, JapanGraduate School of Agricultural Science, Kobe University, 657-8501 Kobe, JapanGraduate School of Agricultural Science, Kobe University, 657-8501 Kobe, JapanGraduate School of Agricultural Science, Kobe University, 657-8501 Kobe, JapanPhotosystems of higher plants alleviate heat-induced damage in the presence of light under moderate stressed conditions; however, in the absence of light (i.e., in the dark), the same plants are damaged more easily. (Yamauchi and Kimura, 2011) We demonstrate that regulating photochemical energy transfer in heat-treated wheat at 40 °C with light contributed to heat tolerance of the photosystem. Chlorophyll fluorescence analysis using heat-stressed wheat seedlings in light showed increased non-photochemical quenching (NPQ) of chlorophyll fluorescence, which was due to thermal dissipation that was increased by state 1 to state 2 transition. Transmission electron microscopy revealed structural changes in thylakoid membranes, including unstacking of grana regions under heat stress in light. It was accompanied by the phosphorylation of thylakoid proteins such as D1 and D2 proteins and the light harvesting complex II proteins Lhcb1 and Lhcb2. These results suggest that heat stress at 40 °C in light induces state 1 to state 2 transition for the preferential excitation of photosystem I (PSI) by phosphorylating thylakoid proteins more strongly. Structural changes of thylakoid membrane also assist the remodeling of photosystems and regulation of energy distribution by transition toward state 2 probably contributes to plastoquione oxidation; thus, light-driven electrons flowing through PSI play a protective role against PSII damage under heat stress.http://www.mdpi.com/1422-0067/15/12/23042heat stressstate transitionwheatthylakoid membranephotosystemphosphorylation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yoko Marutani Yasuo Yamauchi Akihito Miyoshi Kanako Inoue Ken-ichi Ikeda Masaharu Mizutani Yukihiro Sugimoto |
spellingShingle |
Yoko Marutani Yasuo Yamauchi Akihito Miyoshi Kanako Inoue Ken-ichi Ikeda Masaharu Mizutani Yukihiro Sugimoto Regulation of Photochemical Energy Transfer Accompanied by Structural Changes in Thylakoid Membranes of Heat-Stressed Wheat International Journal of Molecular Sciences heat stress state transition wheat thylakoid membrane photosystem phosphorylation |
author_facet |
Yoko Marutani Yasuo Yamauchi Akihito Miyoshi Kanako Inoue Ken-ichi Ikeda Masaharu Mizutani Yukihiro Sugimoto |
author_sort |
Yoko Marutani |
title |
Regulation of Photochemical Energy Transfer Accompanied by Structural Changes in Thylakoid Membranes of Heat-Stressed Wheat |
title_short |
Regulation of Photochemical Energy Transfer Accompanied by Structural Changes in Thylakoid Membranes of Heat-Stressed Wheat |
title_full |
Regulation of Photochemical Energy Transfer Accompanied by Structural Changes in Thylakoid Membranes of Heat-Stressed Wheat |
title_fullStr |
Regulation of Photochemical Energy Transfer Accompanied by Structural Changes in Thylakoid Membranes of Heat-Stressed Wheat |
title_full_unstemmed |
Regulation of Photochemical Energy Transfer Accompanied by Structural Changes in Thylakoid Membranes of Heat-Stressed Wheat |
title_sort |
regulation of photochemical energy transfer accompanied by structural changes in thylakoid membranes of heat-stressed wheat |
publisher |
MDPI AG |
series |
International Journal of Molecular Sciences |
issn |
1422-0067 |
publishDate |
2014-12-01 |
description |
Photosystems of higher plants alleviate heat-induced damage in the presence of light under moderate stressed conditions; however, in the absence of light (i.e., in the dark), the same plants are damaged more easily. (Yamauchi and Kimura, 2011) We demonstrate that regulating photochemical energy transfer in heat-treated wheat at 40 °C with light contributed to heat tolerance of the photosystem. Chlorophyll fluorescence analysis using heat-stressed wheat seedlings in light showed increased non-photochemical quenching (NPQ) of chlorophyll fluorescence, which was due to thermal dissipation that was increased by state 1 to state 2 transition. Transmission electron microscopy revealed structural changes in thylakoid membranes, including unstacking of grana regions under heat stress in light. It was accompanied by the phosphorylation of thylakoid proteins such as D1 and D2 proteins and the light harvesting complex II proteins Lhcb1 and Lhcb2. These results suggest that heat stress at 40 °C in light induces state 1 to state 2 transition for the preferential excitation of photosystem I (PSI) by phosphorylating thylakoid proteins more strongly. Structural changes of thylakoid membrane also assist the remodeling of photosystems and regulation of energy distribution by transition toward state 2 probably contributes to plastoquione oxidation; thus, light-driven electrons flowing through PSI play a protective role against PSII damage under heat stress. |
topic |
heat stress state transition wheat thylakoid membrane photosystem phosphorylation |
url |
http://www.mdpi.com/1422-0067/15/12/23042 |
work_keys_str_mv |
AT yokomarutani regulationofphotochemicalenergytransferaccompaniedbystructuralchangesinthylakoidmembranesofheatstressedwheat AT yasuoyamauchi regulationofphotochemicalenergytransferaccompaniedbystructuralchangesinthylakoidmembranesofheatstressedwheat AT akihitomiyoshi regulationofphotochemicalenergytransferaccompaniedbystructuralchangesinthylakoidmembranesofheatstressedwheat AT kanakoinoue regulationofphotochemicalenergytransferaccompaniedbystructuralchangesinthylakoidmembranesofheatstressedwheat AT kenichiikeda regulationofphotochemicalenergytransferaccompaniedbystructuralchangesinthylakoidmembranesofheatstressedwheat AT masaharumizutani regulationofphotochemicalenergytransferaccompaniedbystructuralchangesinthylakoidmembranesofheatstressedwheat AT yukihirosugimoto regulationofphotochemicalenergytransferaccompaniedbystructuralchangesinthylakoidmembranesofheatstressedwheat |
_version_ |
1725792722121392128 |