Leaf vein xylem conduit diameter influences susceptibility to embolism and hydraulic decline.
Identifieur interne : 000899 ( PubMed/Checkpoint ); précédent : 000898; suivant : 000900Leaf vein xylem conduit diameter influences susceptibility to embolism and hydraulic decline.
Auteurs : Christine Scoffoni [États-Unis] ; Caetano Albuquerque [États-Unis] ; Craig R. Brodersen [États-Unis] ; Shatara V. Townes [États-Unis] ; Grace P. John [États-Unis] ; Hervé Cochard [France] ; Thomas N. Buckley [Australie] ; Andrew J. Mcelrone [États-Unis] ; Lawren Sack [États-Unis]Source :
- The New phytologist [ 1469-8137 ] ; 2017.
Abstract
Ecosystems worldwide are facing increasingly severe and prolonged droughts during which hydraulic failure from drought-induced embolism can lead to organ or whole plant death. Understanding the determinants of xylem failure across species is especially critical in leaves, the engines of plant growth. If the vulnerability segmentation hypothesis holds within leaves, higher order veins that are most terminal in the plant hydraulic system should be more susceptible to embolism to protect the rest of the water transport system. Increased vulnerability in the higher order veins would also be consistent with these experiencing the greatest tensions in the plant xylem network. To test this hypothesis, we combined X-ray micro-computed tomography imaging, hydraulic experiments, cross-sectional anatomy and 3D physiological modelling to investigate how embolisms spread throughout petioles and vein orders during leaf dehydration in relation to conduit dimensions. Decline of leaf xylem hydraulic conductance (Kx ) during dehydration was driven by embolism initiating in petioles and midribs across all species, and Kx vulnerability was strongly correlated with petiole and midrib conduit dimensions. Our simulations showed no significant impact of conduit collapse on Kx decline. We found xylem conduit dimensions play a major role in determining the susceptibility of the leaf water transport system during strong leaf dehydration.
DOI: 10.1111/nph.14256
PubMed: 27861926
Affiliations:
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Clermont-Auvergne, Clermont-Ferrand, 63100, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>PIAF, INRA, Univ. Clermont-Auvergne, Clermont-Ferrand, 63100</wicri:regionArea><wicri:noRegion>63100</wicri:noRegion><wicri:noRegion>63100</wicri:noRegion></affiliation></author><author><name sortKey="Buckley, Thomas N" sort="Buckley, Thomas N" uniqKey="Buckley T" first="Thomas N" last="Buckley">Thomas N. Buckley</name><affiliation wicri:level="4"><nlm:affiliation>Plant Breeding Institute, Faculty of Agriculture and Environment, The University of Sydney, 12656 Newell Hwy, Narrabri, NSW, 2390, Australia.</nlm:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Plant Breeding Institute, Faculty of Agriculture and Environment, The University of Sydney, 12656 Newell Hwy, Narrabri, NSW, 2390</wicri:regionArea><orgName type="university">Université de Sydney</orgName><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author><author><name sortKey="Mcelrone, Andrew J" sort="Mcelrone, Andrew J" uniqKey="Mcelrone A" first="Andrew J" last="Mcelrone">Andrew J. Mcelrone</name><affiliation wicri:level="1"><nlm:affiliation>Department of Viticulture and Enology, University of California, Davis, CA, 95616, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Viticulture and Enology, University of California, Davis, CA, 95616</wicri:regionArea><wicri:noRegion>95616</wicri:noRegion></affiliation></author><author><name sortKey="Sack, Lawren" sort="Sack, Lawren" uniqKey="Sack L" first="Lawren" last="Sack">Lawren Sack</name><affiliation wicri:level="1"><nlm:affiliation>Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Charles E. Young Drive South, Los Angeles, CA, 90095, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Charles E. Young Drive South, Los Angeles, CA, 90095</wicri:regionArea><wicri:noRegion>90095</wicri:noRegion></affiliation></author></analytic><series><title level="j">The New phytologist</title><idno type="eISSN">1469-8137</idno><imprint><date when="2017" type="published">2017</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Ecosystems worldwide are facing increasingly severe and prolonged droughts during which hydraulic failure from drought-induced embolism can lead to organ or whole plant death. Understanding the determinants of xylem failure across species is especially critical in leaves, the engines of plant growth. If the vulnerability segmentation hypothesis holds within leaves, higher order veins that are most terminal in the plant hydraulic system should be more susceptible to embolism to protect the rest of the water transport system. Increased vulnerability in the higher order veins would also be consistent with these experiencing the greatest tensions in the plant xylem network. To test this hypothesis, we combined X-ray micro-computed tomography imaging, hydraulic experiments, cross-sectional anatomy and 3D physiological modelling to investigate how embolisms spread throughout petioles and vein orders during leaf dehydration in relation to conduit dimensions. Decline of leaf xylem hydraulic conductance (Kx ) during dehydration was driven by embolism initiating in petioles and midribs across all species, and Kx vulnerability was strongly correlated with petiole and midrib conduit dimensions. Our simulations showed no significant impact of conduit collapse on Kx decline. We found xylem conduit dimensions play a major role in determining the susceptibility of the leaf water transport system during strong leaf dehydration.</div></front></TEI><pubmed><MedlineCitation Status="In-Process" Owner="NLM"><PMID Version="1">27861926</PMID><DateCreated><Year>2016</Year><Month>11</Month><Day>18</Day></DateCreated><DateRevised><Year>2017</Year><Month>01</Month><Day>12</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1469-8137</ISSN><JournalIssue CitedMedium="Internet"><Volume>213</Volume><Issue>3</Issue><PubDate><Year>2017</Year><Month>Feb</Month></PubDate></JournalIssue><Title>The New phytologist</Title><ISOAbbreviation>New Phytol.</ISOAbbreviation></Journal><ArticleTitle>Leaf vein xylem conduit diameter influences susceptibility to embolism and hydraulic decline.</ArticleTitle><Pagination><MedlinePgn>1076-1092</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1111/nph.14256</ELocationID><Abstract><AbstractText>Ecosystems worldwide are facing increasingly severe and prolonged droughts during which hydraulic failure from drought-induced embolism can lead to organ or whole plant death. Understanding the determinants of xylem failure across species is especially critical in leaves, the engines of plant growth. If the vulnerability segmentation hypothesis holds within leaves, higher order veins that are most terminal in the plant hydraulic system should be more susceptible to embolism to protect the rest of the water transport system. Increased vulnerability in the higher order veins would also be consistent with these experiencing the greatest tensions in the plant xylem network. To test this hypothesis, we combined X-ray micro-computed tomography imaging, hydraulic experiments, cross-sectional anatomy and 3D physiological modelling to investigate how embolisms spread throughout petioles and vein orders during leaf dehydration in relation to conduit dimensions. Decline of leaf xylem hydraulic conductance (Kx ) during dehydration was driven by embolism initiating in petioles and midribs across all species, and Kx vulnerability was strongly correlated with petiole and midrib conduit dimensions. Our simulations showed no significant impact of conduit collapse on Kx decline. We found xylem conduit dimensions play a major role in determining the susceptibility of the leaf water transport system during strong leaf dehydration.</AbstractText><CopyrightInformation>© 2016 The Authors. New Phytologist © 2016 New Phytologist Trust.</CopyrightInformation></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Scoffoni</LastName><ForeName>Christine</ForeName><Initials>C</Initials><AffiliationInfo><Affiliation>Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Charles E. Young Drive South, Los Angeles, CA, 90095, USA.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Department of Biology, Utah State University, Logan, UT, 84322, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Albuquerque</LastName><ForeName>Caetano</ForeName><Initials>C</Initials><AffiliationInfo><Affiliation>Department of Viticulture and Enology, University of California, Davis, CA, 95616, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Brodersen</LastName><ForeName>Craig R</ForeName><Initials>CR</Initials><AffiliationInfo><Affiliation>School of Forestry & Environmental Studies, Yale University, 195 Prospect Street, New Haven, CT, 06511, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Townes</LastName><ForeName>Shatara V</ForeName><Initials>SV</Initials><AffiliationInfo><Affiliation>Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Charles E. Young Drive South, Los Angeles, CA, 90095, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>John</LastName><ForeName>Grace P</ForeName><Initials>GP</Initials><AffiliationInfo><Affiliation>Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Charles E. Young Drive South, Los Angeles, CA, 90095, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Cochard</LastName><ForeName>Hervé</ForeName><Initials>H</Initials><AffiliationInfo><Affiliation>PIAF, INRA, Univ. Clermont-Auvergne, Clermont-Ferrand, 63100, France.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Buckley</LastName><ForeName>Thomas N</ForeName><Initials>TN</Initials><AffiliationInfo><Affiliation>Plant Breeding Institute, Faculty of Agriculture and Environment, The University of Sydney, 12656 Newell Hwy, Narrabri, NSW, 2390, Australia.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>McElrone</LastName><ForeName>Andrew J</ForeName><Initials>AJ</Initials><AffiliationInfo><Affiliation>Department of Viticulture and Enology, University of California, Davis, CA, 95616, USA.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>USDA-Agricultural Research Service, Davis, CA, 95616, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Sack</LastName><ForeName>Lawren</ForeName><Initials>L</Initials><AffiliationInfo><Affiliation>Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Charles E. Young Drive South, Los Angeles, CA, 90095, USA.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2016</Year><Month>11</Month><Day>11</Day></ArticleDate></Article><MedlineJournalInfo><Country>England</Country><MedlineTA>New Phytol</MedlineTA><NlmUniqueID>9882884</NlmUniqueID><ISSNLinking>0028-646X</ISSNLinking></MedlineJournalInfo><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">cavitation</Keyword><Keyword MajorTopicYN="N">microCT</Keyword><Keyword MajorTopicYN="N">percentage loss of conductivity</Keyword><Keyword MajorTopicYN="N">venation architecture</Keyword><Keyword MajorTopicYN="N">xylem collapse</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2016</Year><Month>07</Month><Day>19</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2016</Year><Month>09</Month><Day>10</Day></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2016</Year><Month>11</Month><Day>20</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2016</Year><Month>11</Month><Day>20</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2016</Year><Month>11</Month><Day>19</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">27861926</ArticleId><ArticleId IdType="doi">10.1111/nph.14256</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Australie</li><li>France</li><li>États-Unis</li></country><region><li>Nouvelle-Galles du Sud</li></region><settlement><li>Sydney</li></settlement><orgName><li>Université de Sydney</li></orgName></list><tree><country name="États-Unis"><noRegion><name sortKey="Scoffoni, Christine" sort="Scoffoni, Christine" uniqKey="Scoffoni C" first="Christine" last="Scoffoni">Christine Scoffoni</name></noRegion><name sortKey="Albuquerque, Caetano" sort="Albuquerque, Caetano" uniqKey="Albuquerque C" first="Caetano" last="Albuquerque">Caetano Albuquerque</name><name sortKey="Brodersen, Craig R" sort="Brodersen, Craig R" uniqKey="Brodersen C" first="Craig R" last="Brodersen">Craig R. Brodersen</name><name sortKey="John, Grace P" sort="John, Grace P" uniqKey="John G" first="Grace P" last="John">Grace P. John</name><name sortKey="Mcelrone, Andrew J" sort="Mcelrone, Andrew J" uniqKey="Mcelrone A" first="Andrew J" last="Mcelrone">Andrew J. Mcelrone</name><name sortKey="Sack, Lawren" sort="Sack, Lawren" uniqKey="Sack L" first="Lawren" last="Sack">Lawren Sack</name><name sortKey="Townes, Shatara V" sort="Townes, Shatara V" uniqKey="Townes S" first="Shatara V" last="Townes">Shatara V. Townes</name></country><country name="France"><noRegion><name sortKey="Cochard, Herve" sort="Cochard, Herve" uniqKey="Cochard H" first="Hervé" last="Cochard">Hervé Cochard</name></noRegion></country><country name="Australie"><region name="Nouvelle-Galles du Sud"><name sortKey="Buckley, Thomas N" sort="Buckley, Thomas N" uniqKey="Buckley T" first="Thomas N" last="Buckley">Thomas N. Buckley</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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