More than just CO2 -recycling: corticular photosynthesis as a mechanism to reduce the risk of an energy crisis induced by low oxygen.
Identifieur interne : 000D78 ( Main/Exploration ); précédent : 000D77; suivant : 000D79More than just CO2 -recycling: corticular photosynthesis as a mechanism to reduce the risk of an energy crisis induced by low oxygen.
Auteurs : Christiane Wittmann [Allemagne] ; Hardy Pfanz [Allemagne]Source :
- The New phytologist [ 1469-8137 ] ; 2018.
Descripteurs français
- KwdFr :
- Absorption de rayonnement (MeSH), Chlorophylle (métabolisme), Dioxyde de carbone (métabolisme), Lumière (MeSH), Oxygène (pharmacologie), Photosynthèse (effets des médicaments et des substances chimiques), Photosynthèse (effets des radiations), Populus (effets des médicaments et des substances chimiques), Populus (effets des radiations), Populus (physiologie), Protons (MeSH), Respiration cellulaire (effets des médicaments et des substances chimiques), Respiration cellulaire (effets des radiations), Rythme circadien (effets des médicaments et des substances chimiques), Rythme circadien (effets des radiations), Température (MeSH), Tiges de plante (effets des médicaments et des substances chimiques), Tiges de plante (effets des radiations), Tiges de plante (physiologie).
- MESH :
- effets des médicaments et des substances chimiques : Photosynthèse, Populus, Respiration cellulaire, Rythme circadien, Tiges de plante.
- effets des radiations : Photosynthèse, Populus, Respiration cellulaire, Rythme circadien, Tiges de plante.
- métabolisme : Chlorophylle, Dioxyde de carbone.
- pharmacologie : Oxygène.
- physiologie : Populus, Tiges de plante.
- Absorption de rayonnement, Lumière, Protons, Température.
English descriptors
- KwdEn :
- Absorption, Radiation (MeSH), Carbon Dioxide (metabolism), Cell Respiration (drug effects), Cell Respiration (radiation effects), Chlorophyll (metabolism), Circadian Rhythm (drug effects), Circadian Rhythm (radiation effects), Light (MeSH), Oxygen (pharmacology), Photosynthesis (drug effects), Photosynthesis (radiation effects), Plant Stems (drug effects), Plant Stems (physiology), Plant Stems (radiation effects), Populus (drug effects), Populus (physiology), Populus (radiation effects), Protons (MeSH), Temperature (MeSH).
- MESH :
- chemical , metabolism : Carbon Dioxide, Chlorophyll.
- drug effects : Cell Respiration, Circadian Rhythm, Photosynthesis, Plant Stems, Populus.
- chemical , pharmacology : Oxygen.
- physiology : Plant Stems, Populus.
- radiation effects : Cell Respiration, Circadian Rhythm, Photosynthesis, Plant Stems, Populus.
- Absorption, Radiation, Light, Protons, Temperature.
Abstract
Reassimilation of internal CO2 via corticular photosynthesis (PScort ) has an important effect on the carbon economy of trees. However, little is known about its role as a source of O2 supply to the stem parenchyma and its implications in consumption and movement of O2 within trees. PScort of young Populus nigra (black poplar) trees was investigated by combining optical micro-optode measurements with monitoring of stem chlorophyll fluorescence. During times of zero sap flow in spring, stem oxygen concentrations (cO2 ) exhibited large temporal changes. In the sapwood, over 80% of diurnal changes in cO2 could be explained by respiration rates (Rd(mod) ). In the cortex, photosynthetic oxygen release during the day altered this relationship. With daytime illumination, oxygen levels in the cortex steadily increased from subambient and even exhibited a diel period of superoxia of up to 110% (% air sat.). By contrast, in the sapwood, cO2 never reached ambient levels; the diurnal oxygen deficit was up to 25% of air saturation. Our results confirm that PScort is not only a CO2 -recycling mechanism, it is also a mechanism to actively raise the cortical O2 concentration and counteract temporal/spatial hypoxia inside plant stems.
DOI: 10.1111/nph.15198
PubMed: 29767842
Affiliations:
Links toward previous steps (curation, corpus...)
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last="Pfanz">Hardy Pfanz</name><affiliation wicri:level="1"><nlm:affiliation>Department of Applied Botany and Volcano Biology, University of Duisburg-Essen, Essen, 45117, Germany.</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Department of Applied Botany and Volcano Biology, University of Duisburg-Essen, Essen, 45117</wicri:regionArea><wicri:noRegion>45117</wicri:noRegion><wicri:noRegion>45117</wicri:noRegion><wicri:noRegion>45117</wicri:noRegion></affiliation></author></analytic><series><title level="j">The New phytologist</title><idno type="eISSN">1469-8137</idno><imprint><date when="2018" type="published">2018</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Absorption, Radiation (MeSH)</term><term>Carbon Dioxide (metabolism)</term><term>Cell Respiration (drug effects)</term><term>Cell Respiration (radiation effects)</term><term>Chlorophyll (metabolism)</term><term>Circadian Rhythm (drug effects)</term><term>Circadian Rhythm (radiation effects)</term><term>Light (MeSH)</term><term>Oxygen (pharmacology)</term><term>Photosynthesis (drug effects)</term><term>Photosynthesis (radiation effects)</term><term>Plant Stems (drug effects)</term><term>Plant Stems (physiology)</term><term>Plant Stems (radiation effects)</term><term>Populus (drug effects)</term><term>Populus (physiology)</term><term>Populus (radiation effects)</term><term>Protons (MeSH)</term><term>Temperature (MeSH)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Absorption de rayonnement (MeSH)</term><term>Chlorophylle (métabolisme)</term><term>Dioxyde de carbone (métabolisme)</term><term>Lumière (MeSH)</term><term>Oxygène (pharmacologie)</term><term>Photosynthèse (effets des médicaments et des substances chimiques)</term><term>Photosynthèse (effets des radiations)</term><term>Populus (effets des médicaments et des substances chimiques)</term><term>Populus (effets des radiations)</term><term>Populus (physiologie)</term><term>Protons (MeSH)</term><term>Respiration cellulaire (effets des médicaments et des substances chimiques)</term><term>Respiration cellulaire (effets des radiations)</term><term>Rythme circadien (effets des médicaments et des substances chimiques)</term><term>Rythme circadien (effets des radiations)</term><term>Température (MeSH)</term><term>Tiges de plante (effets des médicaments et des substances chimiques)</term><term>Tiges de plante (effets des radiations)</term><term>Tiges de plante (physiologie)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Carbon Dioxide</term><term>Chlorophyll</term></keywords><keywords scheme="MESH" qualifier="drug effects" xml:lang="en"><term>Cell Respiration</term><term>Circadian Rhythm</term><term>Photosynthesis</term><term>Plant Stems</term><term>Populus</term></keywords><keywords scheme="MESH" qualifier="effets des médicaments et des substances chimiques" xml:lang="fr"><term>Photosynthèse</term><term>Populus</term><term>Respiration cellulaire</term><term>Rythme circadien</term><term>Tiges de plante</term></keywords><keywords scheme="MESH" qualifier="effets des radiations" xml:lang="fr"><term>Photosynthèse</term><term>Populus</term><term>Respiration cellulaire</term><term>Rythme circadien</term><term>Tiges de plante</term></keywords><keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Chlorophylle</term><term>Dioxyde de carbone</term></keywords><keywords scheme="MESH" qualifier="pharmacologie" xml:lang="fr"><term>Oxygène</term></keywords><keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en"><term>Oxygen</term></keywords><keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Populus</term><term>Tiges de plante</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Plant Stems</term><term>Populus</term></keywords><keywords scheme="MESH" qualifier="radiation effects" xml:lang="en"><term>Cell Respiration</term><term>Circadian Rhythm</term><term>Photosynthesis</term><term>Plant Stems</term><term>Populus</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Absorption, Radiation</term><term>Light</term><term>Protons</term><term>Temperature</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Absorption de rayonnement</term><term>Lumière</term><term>Protons</term><term>Température</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Reassimilation of internal CO<sub>2</sub> via corticular photosynthesis (PS<sub>cort</sub> ) has an important effect on the carbon economy of trees. However, little is known about its role as a source of O<sub>2</sub> supply to the stem parenchyma and its implications in consumption and movement of O<sub>2</sub> within trees. PS<sub>cort</sub> of young Populus nigra (black poplar) trees was investigated by combining optical micro-optode measurements with monitoring of stem chlorophyll fluorescence. During times of zero sap flow in spring, stem oxygen concentrations (cO<sub>2</sub> ) exhibited large temporal changes. In the sapwood, over 80% of diurnal changes in cO<sub>2</sub> could be explained by respiration rates (R<sub>d(mod)</sub> ). In the cortex, photosynthetic oxygen release during the day altered this relationship. With daytime illumination, oxygen levels in the cortex steadily increased from subambient and even exhibited a diel period of superoxia of up to 110% (% air sat.). By contrast, in the sapwood, cO<sub>2</sub> never reached ambient levels; the diurnal oxygen deficit was up to 25% of air saturation. Our results confirm that PS<sub>cort</sub> is not only a CO<sub>2</sub> -recycling mechanism, it is also a mechanism to actively raise the cortical O<sub>2</sub> concentration and counteract temporal/spatial hypoxia inside plant stems.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">29767842</PMID><DateCompleted><Year>2019</Year><Month>09</Month><Day>20</Day></DateCompleted><DateRevised><Year>2020</Year><Month>09</Month><Day>30</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1469-8137</ISSN><JournalIssue CitedMedium="Internet"><Volume>219</Volume><Issue>2</Issue><PubDate><Year>2018</Year><Month>07</Month></PubDate></JournalIssue><Title>The New phytologist</Title><ISOAbbreviation>New Phytol</ISOAbbreviation></Journal><ArticleTitle>More than just CO<sub>2</sub> -recycling: corticular photosynthesis as a mechanism to reduce the risk of an energy crisis induced by low oxygen.</ArticleTitle><Pagination><MedlinePgn>551-564</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1111/nph.15198</ELocationID><Abstract><AbstractText>Reassimilation of internal CO<sub>2</sub> via corticular photosynthesis (PS<sub>cort</sub> ) has an important effect on the carbon economy of trees. However, little is known about its role as a source of O<sub>2</sub> supply to the stem parenchyma and its implications in consumption and movement of O<sub>2</sub> within trees. PS<sub>cort</sub> of young Populus nigra (black poplar) trees was investigated by combining optical micro-optode measurements with monitoring of stem chlorophyll fluorescence. During times of zero sap flow in spring, stem oxygen concentrations (cO<sub>2</sub> ) exhibited large temporal changes. In the sapwood, over 80% of diurnal changes in cO<sub>2</sub> could be explained by respiration rates (R<sub>d(mod)</sub> ). In the cortex, photosynthetic oxygen release during the day altered this relationship. With daytime illumination, oxygen levels in the cortex steadily increased from subambient and even exhibited a diel period of superoxia of up to 110% (% air sat.). By contrast, in the sapwood, cO<sub>2</sub> never reached ambient levels; the diurnal oxygen deficit was up to 25% of air saturation. Our results confirm that PS<sub>cort</sub> is not only a CO<sub>2</sub> -recycling mechanism, it is also a mechanism to actively raise the cortical O<sub>2</sub> concentration and counteract temporal/spatial hypoxia inside plant stems.</AbstractText><CopyrightInformation>© 2018 The Authors. New Phytologist © 2018 New Phytologist Trust.</CopyrightInformation></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Wittmann</LastName><ForeName>Christiane</ForeName><Initials>C</Initials><AffiliationInfo><Affiliation>Department of Applied Botany and Volcano Biology, University of Duisburg-Essen, Essen, 45117, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Pfanz</LastName><ForeName>Hardy</ForeName><Initials>H</Initials><AffiliationInfo><Affiliation>Department of Applied Botany and Volcano Biology, University of Duisburg-Essen, Essen, 45117, Germany.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2018</Year><Month>05</Month><Day>16</Day></ArticleDate></Article><MedlineJournalInfo><Country>England</Country><MedlineTA>New Phytol</MedlineTA><NlmUniqueID>9882884</NlmUniqueID><ISSNLinking>0028-646X</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance UI="D011522">Protons</NameOfSubstance></Chemical><Chemical><RegistryNumber>1406-65-1</RegistryNumber><NameOfSubstance UI="D002734">Chlorophyll</NameOfSubstance></Chemical><Chemical><RegistryNumber>142M471B3J</RegistryNumber><NameOfSubstance UI="D002245">Carbon Dioxide</NameOfSubstance></Chemical><Chemical><RegistryNumber>S88TT14065</RegistryNumber><NameOfSubstance UI="D010100">Oxygen</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D065638" MajorTopicYN="N">Absorption, Radiation</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D002245" MajorTopicYN="N">Carbon Dioxide</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D019069" MajorTopicYN="N">Cell Respiration</DescriptorName><QualifierName UI="Q000187" MajorTopicYN="N">drug effects</QualifierName><QualifierName UI="Q000528" MajorTopicYN="N">radiation effects</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D002734" MajorTopicYN="N">Chlorophyll</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D002940" MajorTopicYN="N">Circadian Rhythm</DescriptorName><QualifierName UI="Q000187" MajorTopicYN="N">drug effects</QualifierName><QualifierName UI="Q000528" MajorTopicYN="N">radiation effects</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D008027" MajorTopicYN="N">Light</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D010100" MajorTopicYN="N">Oxygen</DescriptorName><QualifierName UI="Q000494" MajorTopicYN="Y">pharmacology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D010788" MajorTopicYN="Y">Photosynthesis</DescriptorName><QualifierName UI="Q000187" MajorTopicYN="N">drug effects</QualifierName><QualifierName UI="Q000528" MajorTopicYN="N">radiation effects</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D018547" MajorTopicYN="N">Plant Stems</DescriptorName><QualifierName UI="Q000187" MajorTopicYN="N">drug effects</QualifierName><QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName><QualifierName UI="Q000528" MajorTopicYN="N">radiation effects</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D032107" MajorTopicYN="N">Populus</DescriptorName><QualifierName UI="Q000187" MajorTopicYN="N">drug effects</QualifierName><QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName><QualifierName UI="Q000528" MajorTopicYN="N">radiation effects</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D011522" MajorTopicYN="N">Protons</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D013696" MajorTopicYN="N">Temperature</DescriptorName></MeshHeading></MeshHeadingList><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="Y">CO2 fluxes</Keyword><Keyword MajorTopicYN="Y">bark photosynthesis</Keyword><Keyword MajorTopicYN="Y">corticular photosynthesis</Keyword><Keyword MajorTopicYN="Y">hypoxia</Keyword><Keyword MajorTopicYN="Y">stem CO2-recycling</Keyword><Keyword MajorTopicYN="Y">superoxia</Keyword><Keyword MajorTopicYN="Y">xylem sap</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2017</Year><Month>11</Month><Day>20</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2018</Year><Month>03</Month><Day>19</Day></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2018</Year><Month>5</Month><Day>17</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2019</Year><Month>9</Month><Day>21</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2018</Year><Month>5</Month><Day>17</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">29767842</ArticleId><ArticleId IdType="doi">10.1111/nph.15198</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Allemagne</li></country></list><tree><country name="Allemagne"><noRegion><name sortKey="Wittmann, Christiane" sort="Wittmann, Christiane" uniqKey="Wittmann C" first="Christiane" last="Wittmann">Christiane Wittmann</name></noRegion><name sortKey="Pfanz, Hardy" sort="Pfanz, Hardy" uniqKey="Pfanz H" first="Hardy" last="Pfanz">Hardy Pfanz</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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