The stoichiometry of the two photosystems in higher plants revisited.
Identifieur interne : 003A49 ( Main/Exploration ); précédent : 003A48; suivant : 003A50The stoichiometry of the two photosystems in higher plants revisited.
Auteurs : Da-Yong Fan [Australie] ; Alexander B. Hope ; Paul J. Smith ; Husen Jia ; Ronald J. Pace ; Jan M. Anderson ; Wah Soon ChowSource :
- Biochimica et biophysica acta [ 0006-3002 ] ; 2007.
Descripteurs français
- KwdFr :
- Complexe protéique du photosystème I (composition chimique), Complexe protéique du photosystème I (métabolisme), Complexe protéique du photosystème II (composition chimique), Complexe protéique du photosystème II (métabolisme), Complexes collecteurs de lumière (composition chimique), Complexes collecteurs de lumière (métabolisme), Cucumis sativus (composition chimique), Cucumis sativus (métabolisme), Lumière (MeSH), Oxydoréduction (MeSH), Oxygène (métabolisme), Photosynthèse (MeSH), Potentiels de membrane (physiologie), Protéines végétales (composition chimique), Protéines végétales (métabolisme), Spinacia oleracea (composition chimique), Spinacia oleracea (métabolisme), Thylacoïdes (composition chimique), Thylacoïdes (métabolisme).
- MESH :
- composition chimique : Complexe protéique du photosystème I, Complexe protéique du photosystème II, Complexes collecteurs de lumière, Cucumis sativus, Protéines végétales, Spinacia oleracea, Thylacoïdes.
- métabolisme : Complexe protéique du photosystème I, Complexe protéique du photosystème II, Complexes collecteurs de lumière, Cucumis sativus, Oxygène, Protéines végétales, Spinacia oleracea, Thylacoïdes.
- physiologie : Potentiels de membrane.
- Lumière, Oxydoréduction, Photosynthèse.
English descriptors
- KwdEn :
- Cucumis sativus (chemistry), Cucumis sativus (metabolism), Light (MeSH), Light-Harvesting Protein Complexes (chemistry), Light-Harvesting Protein Complexes (metabolism), Membrane Potentials (physiology), Oxidation-Reduction (MeSH), Oxygen (metabolism), Photosynthesis (MeSH), Photosystem I Protein Complex (chemistry), Photosystem I Protein Complex (metabolism), Photosystem II Protein Complex (chemistry), Photosystem II Protein Complex (metabolism), Plant Proteins (chemistry), Plant Proteins (metabolism), Spinacia oleracea (chemistry), Spinacia oleracea (metabolism), Thylakoids (chemistry), Thylakoids (metabolism).
- MESH :
- chemical , chemistry : Light-Harvesting Protein Complexes, Photosystem I Protein Complex, Photosystem II Protein Complex, Plant Proteins.
- chemistry : Cucumis sativus, Spinacia oleracea, Thylakoids.
- metabolism : Cucumis sativus, Light-Harvesting Protein Complexes, Oxygen, Photosystem I Protein Complex, Photosystem II Protein Complex, Plant Proteins, Spinacia oleracea, Thylakoids.
- physiology : Membrane Potentials.
- Light, Oxidation-Reduction, Photosynthesis.
Abstract
The stoichiometry of Photosystem II (PSII) to Photosystem I (PSI) reaction centres in spinach leaf segments was determined by two methods, each capable of being applied to monitor the presence of both photosystems in a given sample. One method was based on a fast electrochromic (EC) signal, which in the millisecond time scale represents a change in the delocalized electric potential difference across the thylakoid membrane resulting from charge separation in both photosystems. This method was applied to leaf segments, thus avoiding any potential artefacts associated with the isolation of thylakoid membranes. Two variations of this method, suppressing PSII activity by prior photoinactivation (in spinach and poplar leaf segments) or suppressing PSI by photo-oxidation of P700 (the chlorophyll dimer in PSI) with background far-red light (in spinach, poplar and cucumber leaf segments), each gave the separate contribution of each photosystem to the fast EC signal; the PSII/PSI stoichiometry obtained by this method was in the range 1.5-1.9 for the three plant species, and 1.5-1.8 for spinach in particular. A second method, based on electron paramagnetic resonance (EPR), gave values in a comparable range of 1.7-2.1 for spinach. A third method, which consisted of separately determining the content of functional PSII in leaf segments by the oxygen yield per single turnover-flash and that of PSI by photo-oxidation of P700 in thylakoids isolated from the corresponding leaves, gave a PSII/PSI stoichiometry (1.5-1.7) that was consistent with the above values. It is concluded that the ratio of PSII to PSI reaction centres is considerably higher than unity in typical higher plants, in contrast to a surprisingly low PSII/PSI ratio of 0.88, determined by EPR, that was reported for spinach grown in a cabinet under far-red-deficient light in Sweden [Danielsson et al. (2004) Biochim. Biophys. Acta 1608: 53-61]. We suggest that the low PSII/PSI ratio in the Swedish spinach, grown in far-red-deficient light with a lower PSII content, is not due to greater accuracy of the EPR method of measurement, as suggested by the authors, but is rather due to the growth conditions.
DOI: 10.1016/j.bbabio.2007.06.001
PubMed: 17618597
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<term>Cucumis sativus (metabolism)</term>
<term>Light (MeSH)</term>
<term>Light-Harvesting Protein Complexes (chemistry)</term>
<term>Light-Harvesting Protein Complexes (metabolism)</term>
<term>Membrane Potentials (physiology)</term>
<term>Oxidation-Reduction (MeSH)</term>
<term>Oxygen (metabolism)</term>
<term>Photosynthesis (MeSH)</term>
<term>Photosystem I Protein Complex (chemistry)</term>
<term>Photosystem I Protein Complex (metabolism)</term>
<term>Photosystem II Protein Complex (chemistry)</term>
<term>Photosystem II Protein Complex (metabolism)</term>
<term>Plant Proteins (chemistry)</term>
<term>Plant Proteins (metabolism)</term>
<term>Spinacia oleracea (chemistry)</term>
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<term>Thylakoids (chemistry)</term>
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<term>Complexe protéique du photosystème II (métabolisme)</term>
<term>Complexes collecteurs de lumière (composition chimique)</term>
<term>Complexes collecteurs de lumière (métabolisme)</term>
<term>Cucumis sativus (composition chimique)</term>
<term>Cucumis sativus (métabolisme)</term>
<term>Lumière (MeSH)</term>
<term>Oxydoréduction (MeSH)</term>
<term>Oxygène (métabolisme)</term>
<term>Photosynthèse (MeSH)</term>
<term>Potentiels de membrane (physiologie)</term>
<term>Protéines végétales (composition chimique)</term>
<term>Protéines végétales (métabolisme)</term>
<term>Spinacia oleracea (composition chimique)</term>
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<keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Light-Harvesting Protein Complexes</term>
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<term>Photosystem II Protein Complex</term>
<term>Plant Proteins</term>
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<keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Cucumis sativus</term>
<term>Spinacia oleracea</term>
<term>Thylakoids</term>
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<term>Complexe protéique du photosystème II</term>
<term>Complexes collecteurs de lumière</term>
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<term>Protéines végétales</term>
<term>Spinacia oleracea</term>
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<term>Oxygen</term>
<term>Photosystem I Protein Complex</term>
<term>Photosystem II Protein Complex</term>
<term>Plant Proteins</term>
<term>Spinacia oleracea</term>
<term>Thylakoids</term>
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<term>Complexe protéique du photosystème II</term>
<term>Complexes collecteurs de lumière</term>
<term>Cucumis sativus</term>
<term>Oxygène</term>
<term>Protéines végétales</term>
<term>Spinacia oleracea</term>
<term>Thylacoïdes</term>
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<term>Photosynthesis</term>
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<front><div type="abstract" xml:lang="en">The stoichiometry of Photosystem II (PSII) to Photosystem I (PSI) reaction centres in spinach leaf segments was determined by two methods, each capable of being applied to monitor the presence of both photosystems in a given sample. One method was based on a fast electrochromic (EC) signal, which in the millisecond time scale represents a change in the delocalized electric potential difference across the thylakoid membrane resulting from charge separation in both photosystems. This method was applied to leaf segments, thus avoiding any potential artefacts associated with the isolation of thylakoid membranes. Two variations of this method, suppressing PSII activity by prior photoinactivation (in spinach and poplar leaf segments) or suppressing PSI by photo-oxidation of P700 (the chlorophyll dimer in PSI) with background far-red light (in spinach, poplar and cucumber leaf segments), each gave the separate contribution of each photosystem to the fast EC signal; the PSII/PSI stoichiometry obtained by this method was in the range 1.5-1.9 for the three plant species, and 1.5-1.8 for spinach in particular. A second method, based on electron paramagnetic resonance (EPR), gave values in a comparable range of 1.7-2.1 for spinach. A third method, which consisted of separately determining the content of functional PSII in leaf segments by the oxygen yield per single turnover-flash and that of PSI by photo-oxidation of P700 in thylakoids isolated from the corresponding leaves, gave a PSII/PSI stoichiometry (1.5-1.7) that was consistent with the above values. It is concluded that the ratio of PSII to PSI reaction centres is considerably higher than unity in typical higher plants, in contrast to a surprisingly low PSII/PSI ratio of 0.88, determined by EPR, that was reported for spinach grown in a cabinet under far-red-deficient light in Sweden [Danielsson et al. (2004) Biochim. Biophys. Acta 1608: 53-61]. We suggest that the low PSII/PSI ratio in the Swedish spinach, grown in far-red-deficient light with a lower PSII content, is not due to greater accuracy of the EPR method of measurement, as suggested by the authors, but is rather due to the growth conditions.</div>
</front>
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<Abstract><AbstractText>The stoichiometry of Photosystem II (PSII) to Photosystem I (PSI) reaction centres in spinach leaf segments was determined by two methods, each capable of being applied to monitor the presence of both photosystems in a given sample. One method was based on a fast electrochromic (EC) signal, which in the millisecond time scale represents a change in the delocalized electric potential difference across the thylakoid membrane resulting from charge separation in both photosystems. This method was applied to leaf segments, thus avoiding any potential artefacts associated with the isolation of thylakoid membranes. Two variations of this method, suppressing PSII activity by prior photoinactivation (in spinach and poplar leaf segments) or suppressing PSI by photo-oxidation of P700 (the chlorophyll dimer in PSI) with background far-red light (in spinach, poplar and cucumber leaf segments), each gave the separate contribution of each photosystem to the fast EC signal; the PSII/PSI stoichiometry obtained by this method was in the range 1.5-1.9 for the three plant species, and 1.5-1.8 for spinach in particular. A second method, based on electron paramagnetic resonance (EPR), gave values in a comparable range of 1.7-2.1 for spinach. A third method, which consisted of separately determining the content of functional PSII in leaf segments by the oxygen yield per single turnover-flash and that of PSI by photo-oxidation of P700 in thylakoids isolated from the corresponding leaves, gave a PSII/PSI stoichiometry (1.5-1.7) that was consistent with the above values. It is concluded that the ratio of PSII to PSI reaction centres is considerably higher than unity in typical higher plants, in contrast to a surprisingly low PSII/PSI ratio of 0.88, determined by EPR, that was reported for spinach grown in a cabinet under far-red-deficient light in Sweden [Danielsson et al. (2004) Biochim. Biophys. Acta 1608: 53-61]. We suggest that the low PSII/PSI ratio in the Swedish spinach, grown in far-red-deficient light with a lower PSII content, is not due to greater accuracy of the EPR method of measurement, as suggested by the authors, but is rather due to the growth conditions.</AbstractText>
</Abstract>
<AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Fan</LastName>
<ForeName>Da-Yong</ForeName>
<Initials>DY</Initials>
<AffiliationInfo><Affiliation>Photobioenergetics Group, Research School of Biological Sciences, The Australian National University, Canberra, ACT 0200, Australia.</Affiliation>
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<Author ValidYN="Y"><LastName>Hope</LastName>
<ForeName>Alexander B</ForeName>
<Initials>AB</Initials>
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<Author ValidYN="Y"><LastName>Smith</LastName>
<ForeName>Paul J</ForeName>
<Initials>PJ</Initials>
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<Author ValidYN="Y"><LastName>Jia</LastName>
<ForeName>Husen</ForeName>
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<Author ValidYN="Y"><LastName>Pace</LastName>
<ForeName>Ronald J</ForeName>
<Initials>RJ</Initials>
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<Author ValidYN="Y"><LastName>Anderson</LastName>
<ForeName>Jan M</ForeName>
<Initials>JM</Initials>
</Author>
<Author ValidYN="Y"><LastName>Chow</LastName>
<ForeName>Wah Soon</ForeName>
<Initials>WS</Initials>
</Author>
</AuthorList>
<Language>eng</Language>
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<MeshHeadingList><MeshHeading><DescriptorName UI="D018553" MajorTopicYN="N">Cucumis sativus</DescriptorName>
<QualifierName UI="Q000737" MajorTopicYN="N">chemistry</QualifierName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
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<MeshHeading><DescriptorName UI="D008027" MajorTopicYN="N">Light</DescriptorName>
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<MeshHeading><DescriptorName UI="D045342" MajorTopicYN="N">Light-Harvesting Protein Complexes</DescriptorName>
<QualifierName UI="Q000737" MajorTopicYN="N">chemistry</QualifierName>
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<MeshHeading><DescriptorName UI="D008564" MajorTopicYN="N">Membrane Potentials</DescriptorName>
<QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D010084" MajorTopicYN="N">Oxidation-Reduction</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D010100" MajorTopicYN="N">Oxygen</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
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<MeshHeading><DescriptorName UI="D010788" MajorTopicYN="N">Photosynthesis</DescriptorName>
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<MeshHeading><DescriptorName UI="D045331" MajorTopicYN="N">Photosystem I Protein Complex</DescriptorName>
<QualifierName UI="Q000737" MajorTopicYN="N">chemistry</QualifierName>
<QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName>
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<MeshHeading><DescriptorName UI="D045332" MajorTopicYN="N">Photosystem II Protein Complex</DescriptorName>
<QualifierName UI="Q000737" MajorTopicYN="N">chemistry</QualifierName>
<QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D010940" MajorTopicYN="N">Plant Proteins</DescriptorName>
<QualifierName UI="Q000737" MajorTopicYN="N">chemistry</QualifierName>
<QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D018724" MajorTopicYN="N">Spinacia oleracea</DescriptorName>
<QualifierName UI="Q000737" MajorTopicYN="N">chemistry</QualifierName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D020524" MajorTopicYN="N">Thylakoids</DescriptorName>
<QualifierName UI="Q000737" MajorTopicYN="N">chemistry</QualifierName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
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<name sortKey="Hope, Alexander B" sort="Hope, Alexander B" uniqKey="Hope A" first="Alexander B" last="Hope">Alexander B. Hope</name>
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<name sortKey="Smith, Paul J" sort="Smith, Paul J" uniqKey="Smith P" first="Paul J" last="Smith">Paul J. Smith</name>
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<country name="Australie"><noRegion><name sortKey="Fan, Da Yong" sort="Fan, Da Yong" uniqKey="Fan D" first="Da-Yong" last="Fan">Da-Yong Fan</name>
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</affiliations>
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