Photosynthetic regulation under fluctuating light in field-grown Cerasus cerasoides: A comparison of young and mature leaves.
Identifieur interne : 000110 ( Main/Corpus ); précédent : 000109; suivant : 000111Photosynthetic regulation under fluctuating light in field-grown Cerasus cerasoides: A comparison of young and mature leaves.
Auteurs : Ying-Jie Yang ; Shi-Bao Zhang ; Ji-Hua Wang ; Wei HuangSource :
- Biochimica et biophysica acta. Bioenergetics [ 1879-2650 ] ; 2019.
English descriptors
- KwdEn :
- Adaptation, Physiological (MeSH), Hydrogen-Ion Concentration (MeSH), Light (MeSH), Oxidation-Reduction (MeSH), Periodicity (MeSH), Photosynthesis (physiology), Photosynthesis (radiation effects), Photosystem I Protein Complex (metabolism), Photosystem II Protein Complex (metabolism), Plant Leaves (growth & development), Plant Leaves (physiology), Plant Leaves (radiation effects), Protons (MeSH), Prunus (growth & development), Prunus (physiology), Prunus (radiation effects), Thylakoids (physiology), Thylakoids (radiation effects).
- MESH :
- chemical , metabolism : Photosystem I Protein Complex, Photosystem II Protein Complex.
- growth & development : Plant Leaves, Prunus.
- physiology : Photosynthesis, Plant Leaves, Prunus, Thylakoids.
- radiation effects : Photosynthesis, Plant Leaves, Prunus, Thylakoids.
- Adaptation, Physiological, Hydrogen-Ion Concentration, Light, Oxidation-Reduction, Periodicity, Protons.
Abstract
Photosystem I (PSI) is a potential target of photoinhibition under fluctuating light. However, photosynthetic regulation under fluctuating light in field-grown plants is little known. Furthermore, it is unclear how young leaves protect PSI against fluctuating light under natural field conditions. In the present study, we examined chlorophyll fluorescence, P700 redox state and the electrochromic shift signal in the young and mature leaves of field-grown Cerasus cerasoides (Rosaceae). Within the first seconds after any increase in light intensity, young leaves showed higher proton gradient (ΔpH) across the thylakoid membranes than the mature leaves, preventing over-reduction of PSI in the young leaves. As a result, PSI was more tolerant to fluctuating light in the young leaves than in the mature leaves. Interestingly, after transition from low to high light, the activity of cyclic electron flow (CEF) in young leaves increased first to a high level and then decreased to a stable value, while this rapid stimulation of CEF was not observed in the mature leaves. Furthermore, the over-reduction of PSI significantly stimulated CEF in the young leaves but not in the mature leaves. Taken together, within the first seconds after any increase in illumination, the stimulation of CEF favors the rapid lumen acidification and optimizes the PSI redox state in the young leaves, protecting PSI against photoinhibition under fluctuating light in field-grown plants.
DOI: 10.1016/j.bbabio.2019.148073
PubMed: 31473302
Links to Exploration step
pubmed:31473302Le document en format XML
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<author><name sortKey="Yang, Ying Jie" sort="Yang, Ying Jie" uniqKey="Yang Y" first="Ying-Jie" last="Yang">Ying-Jie Yang</name>
<affiliation><nlm:affiliation>Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, China; University of Chinese Academy of Sciences, Beijing 100049, China.</nlm:affiliation>
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<author><name sortKey="Zhang, Shi Bao" sort="Zhang, Shi Bao" uniqKey="Zhang S" first="Shi-Bao" last="Zhang">Shi-Bao Zhang</name>
<affiliation><nlm:affiliation>Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, China.</nlm:affiliation>
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<author><name sortKey="Wang, Ji Hua" sort="Wang, Ji Hua" uniqKey="Wang J" first="Ji-Hua" last="Wang">Ji-Hua Wang</name>
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<author><name sortKey="Huang, Wei" sort="Huang, Wei" uniqKey="Huang W" first="Wei" last="Huang">Wei Huang</name>
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<term>Hydrogen-Ion Concentration (MeSH)</term>
<term>Light (MeSH)</term>
<term>Oxidation-Reduction (MeSH)</term>
<term>Periodicity (MeSH)</term>
<term>Photosynthesis (physiology)</term>
<term>Photosynthesis (radiation effects)</term>
<term>Photosystem I Protein Complex (metabolism)</term>
<term>Photosystem II Protein Complex (metabolism)</term>
<term>Plant Leaves (growth & development)</term>
<term>Plant Leaves (physiology)</term>
<term>Plant Leaves (radiation effects)</term>
<term>Protons (MeSH)</term>
<term>Prunus (growth & development)</term>
<term>Prunus (physiology)</term>
<term>Prunus (radiation effects)</term>
<term>Thylakoids (physiology)</term>
<term>Thylakoids (radiation effects)</term>
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<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Photosystem I Protein Complex</term>
<term>Photosystem II Protein Complex</term>
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<keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Plant Leaves</term>
<term>Prunus</term>
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<term>Prunus</term>
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<keywords scheme="MESH" qualifier="radiation effects" xml:lang="en"><term>Photosynthesis</term>
<term>Plant Leaves</term>
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<term>Hydrogen-Ion Concentration</term>
<term>Light</term>
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<front><div type="abstract" xml:lang="en">Photosystem I (PSI) is a potential target of photoinhibition under fluctuating light. However, photosynthetic regulation under fluctuating light in field-grown plants is little known. Furthermore, it is unclear how young leaves protect PSI against fluctuating light under natural field conditions. In the present study, we examined chlorophyll fluorescence, P700 redox state and the electrochromic shift signal in the young and mature leaves of field-grown Cerasus cerasoides (Rosaceae). Within the first seconds after any increase in light intensity, young leaves showed higher proton gradient (ΔpH) across the thylakoid membranes than the mature leaves, preventing over-reduction of PSI in the young leaves. As a result, PSI was more tolerant to fluctuating light in the young leaves than in the mature leaves. Interestingly, after transition from low to high light, the activity of cyclic electron flow (CEF) in young leaves increased first to a high level and then decreased to a stable value, while this rapid stimulation of CEF was not observed in the mature leaves. Furthermore, the over-reduction of PSI significantly stimulated CEF in the young leaves but not in the mature leaves. Taken together, within the first seconds after any increase in illumination, the stimulation of CEF favors the rapid lumen acidification and optimizes the PSI redox state in the young leaves, protecting PSI against photoinhibition under fluctuating light in field-grown plants.</div>
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<Title>Biochimica et biophysica acta. Bioenergetics</Title>
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<Abstract><AbstractText>Photosystem I (PSI) is a potential target of photoinhibition under fluctuating light. However, photosynthetic regulation under fluctuating light in field-grown plants is little known. Furthermore, it is unclear how young leaves protect PSI against fluctuating light under natural field conditions. In the present study, we examined chlorophyll fluorescence, P700 redox state and the electrochromic shift signal in the young and mature leaves of field-grown Cerasus cerasoides (Rosaceae). Within the first seconds after any increase in light intensity, young leaves showed higher proton gradient (ΔpH) across the thylakoid membranes than the mature leaves, preventing over-reduction of PSI in the young leaves. As a result, PSI was more tolerant to fluctuating light in the young leaves than in the mature leaves. Interestingly, after transition from low to high light, the activity of cyclic electron flow (CEF) in young leaves increased first to a high level and then decreased to a stable value, while this rapid stimulation of CEF was not observed in the mature leaves. Furthermore, the over-reduction of PSI significantly stimulated CEF in the young leaves but not in the mature leaves. Taken together, within the first seconds after any increase in illumination, the stimulation of CEF favors the rapid lumen acidification and optimizes the PSI redox state in the young leaves, protecting PSI against photoinhibition under fluctuating light in field-grown plants.</AbstractText>
<CopyrightInformation>Copyright © 2019 Elsevier B.V. All rights reserved.</CopyrightInformation>
</Abstract>
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