Contribution and consequences of xylem-transported CO2 assimilation for C3 plants.
Identifieur interne : 000A53 ( Main/Exploration ); précédent : 000A52; suivant : 000A54Contribution and consequences of xylem-transported CO2 assimilation for C3 plants.
Auteurs : Samantha S. Stutz [États-Unis] ; David T. Hanson [États-Unis]Source :
- The New phytologist [ 1469-8137 ] ; 2019.
Descripteurs français
- KwdFr :
- MESH :
- effets des radiations : Feuilles de plante, Photosynthèse, Transport biologique, Xylème.
- métabolisme : Carbone, Dioxyde de carbone, Feuilles de plante, Xylème.
- Lumière.
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Carbon, Carbon Dioxide.
- metabolism : Plant Leaves, Xylem.
- radiation effects : Biological Transport, Photosynthesis, Plant Leaves, Xylem.
- Light.
Abstract
Traditionally, leaves were thought to be supplied with CO2 for photosynthesis by the atmosphere and respiration. Recent studies, however, have shown that the xylem also transports a significant amount of inorganic carbon into leaves through the bulk flow of water. However, little is known about the dynamics and proportion of xylem-transported CO2 that is assimilated, vs simply lost to transpiration. Cut leaves of Populus deltoides and Brassica napus were placed in either KCl or one of three [NaH13 CO3 ] solutions dissolved in water to simultaneously measure the assimilation and the efflux of xylem-transported CO2 exiting the leaf across light and CO2 response curves in real-time using a tunable diode laser absorption spectroscope. The rates of assimilation and efflux of xylem-transported CO2 increased with increasing xylem [13 CO2 *] and transpiration. Under saturating irradiance, rates of assimilation using xylem-transported CO2 accounted for c. 2.5% of the total assimilation in both species in the highest [13 CO2 *]. The majority of xylem-transported CO2 is assimilated, and efflux is small compared to respiration. Assimilation of xylem-transported CO2 comprises a small portion of total photosynthesis, but may be more important when CO2 is limiting.
DOI: 10.1111/nph.15907
PubMed: 31081546
Affiliations:
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Le document en format XML
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Recent studies, however, have shown that the xylem also transports a significant amount of inorganic carbon into leaves through the bulk flow of water. However, little is known about the dynamics and proportion of xylem-transported CO<sub>2</sub> that is assimilated, vs simply lost to transpiration. Cut leaves of Populus deltoides and Brassica napus were placed in either KCl or one of three [NaH<sup>13</sup> CO<sub>3</sub> ] solutions dissolved in water to simultaneously measure the assimilation and the efflux of xylem-transported CO<sub>2</sub> exiting the leaf across light and CO<sub>2</sub> response curves in real-time using a tunable diode laser absorption spectroscope. The rates of assimilation and efflux of xylem-transported CO<sub>2</sub> increased with increasing xylem [<sup>13</sup> CO<sub>2</sub> *] and transpiration. Under saturating irradiance, rates of assimilation using xylem-transported CO<sub>2</sub> accounted for c. 2.5% of the total assimilation in both species in the highest [<sup>13</sup> CO<sub>2</sub> *]. The majority of xylem-transported CO<sub>2</sub> is assimilated, and efflux is small compared to respiration. Assimilation of xylem-transported CO<sub>2</sub> comprises a small portion of total photosynthesis, but may be more important when CO<sub>2</sub> is limiting.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">31081546</PMID><DateCompleted><Year>2020</Year><Month>02</Month><Day>28</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>223</Volume><Issue>3</Issue><PubDate><Year>2019</Year><Month>08</Month></PubDate></JournalIssue><Title>The New phytologist</Title><ISOAbbreviation>New Phytol</ISOAbbreviation></Journal><ArticleTitle>Contribution and consequences of xylem-transported CO<sub>2</sub> assimilation for C<sub>3</sub> plants.</ArticleTitle><Pagination><MedlinePgn>1230-1240</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1111/nph.15907</ELocationID><Abstract><AbstractText>Traditionally, leaves were thought to be supplied with CO<sub>2</sub> for photosynthesis by the atmosphere and respiration. Recent studies, however, have shown that the xylem also transports a significant amount of inorganic carbon into leaves through the bulk flow of water. However, little is known about the dynamics and proportion of xylem-transported CO<sub>2</sub> that is assimilated, vs simply lost to transpiration. Cut leaves of Populus deltoides and Brassica napus were placed in either KCl or one of three [NaH<sup>13</sup> CO<sub>3</sub> ] solutions dissolved in water to simultaneously measure the assimilation and the efflux of xylem-transported CO<sub>2</sub> exiting the leaf across light and CO<sub>2</sub> response curves in real-time using a tunable diode laser absorption spectroscope. The rates of assimilation and efflux of xylem-transported CO<sub>2</sub> increased with increasing xylem [<sup>13</sup> CO<sub>2</sub> *] and transpiration. Under saturating irradiance, rates of assimilation using xylem-transported CO<sub>2</sub> accounted for c. 2.5% of the total assimilation in both species in the highest [<sup>13</sup> CO<sub>2</sub> *]. The majority of xylem-transported CO<sub>2</sub> is assimilated, and efflux is small compared to respiration. Assimilation of xylem-transported CO<sub>2</sub> comprises a small portion of total photosynthesis, but may be more important when CO<sub>2</sub> is limiting.</AbstractText><CopyrightInformation>© 2019 The Authors. New Phytologist © 2019 New Phytologist Trust.</CopyrightInformation></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Stutz</LastName><ForeName>Samantha S</ForeName><Initials>SS</Initials><Identifier Source="ORCID">0000-0002-3999-9726</Identifier><AffiliationInfo><Affiliation>Department of Biology, University of New Mexico, Albuquerque, NM, 87131, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Hanson</LastName><ForeName>David T</ForeName><Initials>DT</Initials><Identifier Source="ORCID">0000-0003-0964-9335</Identifier><AffiliationInfo><Affiliation>Department of Biology, University of New Mexico, Albuquerque, NM, 87131, USA.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013486">Research Support, U.S. Gov't, Non-P.H.S.</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2019</Year><Month>06</Month><Day>20</Day></ArticleDate></Article><MedlineJournalInfo><Country>England</Country><MedlineTA>New Phytol</MedlineTA><NlmUniqueID>9882884</NlmUniqueID><ISSNLinking>0028-646X</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>142M471B3J</RegistryNumber><NameOfSubstance UI="D002245">Carbon Dioxide</NameOfSubstance></Chemical><Chemical><RegistryNumber>7440-44-0</RegistryNumber><NameOfSubstance UI="D002244">Carbon</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D001692" MajorTopicYN="N">Biological Transport</DescriptorName><QualifierName UI="Q000528" MajorTopicYN="N">radiation effects</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D002244" MajorTopicYN="N">Carbon</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D002245" MajorTopicYN="N">Carbon Dioxide</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D008027" MajorTopicYN="N">Light</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D010788" MajorTopicYN="N">Photosynthesis</DescriptorName><QualifierName UI="Q000528" MajorTopicYN="N">radiation effects</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D018515" MajorTopicYN="N">Plant Leaves</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName><QualifierName UI="Q000528" MajorTopicYN="N">radiation effects</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D052584" MajorTopicYN="N">Xylem</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName><QualifierName UI="Q000528" MajorTopicYN="N">radiation effects</QualifierName></MeshHeading></MeshHeadingList><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="Y">Brassica napus
</Keyword><Keyword MajorTopicYN="Y">Populus deltoides
</Keyword><Keyword MajorTopicYN="Y">CO2 efflux</Keyword><Keyword MajorTopicYN="Y">internally transported CO2</Keyword><Keyword MajorTopicYN="Y">leaf photosynthesis models</Keyword><Keyword MajorTopicYN="Y">stem [CO2*]</Keyword><Keyword MajorTopicYN="Y">tunable diode laser absorption spectroscopy</Keyword><Keyword MajorTopicYN="Y">xylem-transported CO2</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2018</Year><Month>08</Month><Day>06</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2019</Year><Month>05</Month><Day>03</Day></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2019</Year><Month>5</Month><Day>14</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2020</Year><Month>2</Month><Day>29</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2019</Year><Month>5</Month><Day>14</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">31081546</ArticleId><ArticleId IdType="doi">10.1111/nph.15907</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>États-Unis</li></country></list><tree><country name="États-Unis"><noRegion><name sortKey="Stutz, Samantha S" sort="Stutz, Samantha S" uniqKey="Stutz S" first="Samantha S" last="Stutz">Samantha S. Stutz</name></noRegion><name sortKey="Hanson, David T" sort="Hanson, David T" uniqKey="Hanson D" first="David T" last="Hanson">David T. Hanson</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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