Are needles of Pinus pinaster more vulnerable to xylem embolism than branches? New insights from X-ray computed tomography.
Identifieur interne : 002348 ( Main/Exploration ); précédent : 002347; suivant : 002349Are needles of Pinus pinaster more vulnerable to xylem embolism than branches? New insights from X-ray computed tomography.
Auteurs : Pauline S. Bouche [Allemagne] ; Sylvain Delzon [France] ; Brendan Choat [Australie] ; Eric Badel [France] ; Timothy J. Brodribb [Australie] ; Regis Burlett [France] ; Hervé Cochard [France] ; Katline Charra-Vaskou [France] ; Bruno Lavigne [France] ; Shan Li [Allemagne] ; Stefan Mayr [Autriche] ; Hugh Morris [Allemagne] ; José M. Torres-Ruiz [France] ; Vivian Zufferey [Suisse] ; Steven Jansen [Allemagne]Source :
- Plant, cell & environment [ 1365-3040 ] ; 2016.
Descripteurs français
- KwdFr :
- MESH :
- anatomie et histologie : Tiges de plante, Xylème.
- physiologie : Arbres, Feuilles de plante, Pinus, Tiges de plante, Xylème.
- Déshydratation, Tomodensitométrie.
English descriptors
- KwdEn :
- MESH :
- anatomy & histology : Plant Stems, Xylem.
- methods : Tomography, X-Ray Computed.
- physiology : Pinus, Plant Leaves, Plant Stems, Trees, Xylem.
- Dehydration.
Abstract
Plants can be highly segmented organisms with an independently redundant design of organs. In the context of plant hydraulics, leaves may be less embolism resistant than stems, allowing hydraulic failure to be restricted to distal organs that can be readily replaced. We quantified drought-induced embolism in needles and stems of Pinus pinaster using high-resolution computed tomography (HRCT). HRCT observations of needles were compared with the rehydration kinetics method to estimate the contribution of extra-xylary pathways to declining hydraulic conductance. High-resolution computed tomography images indicated that the pressure inducing 50% of embolized tracheids was similar between needle and stem xylem (P50 needle xylem = -3.62 MPa, P50 stem xylem = -3.88 MPa). Tracheids in both organs showed no difference in torus overlap of bordered pits. However, estimations of the pressure inducing 50% loss of hydraulic conductance at the whole needle level by the rehydration kinetics method were significantly higher (P50 needle = -1.71 MPa) than P50 needle xylem derived from HRCT. The vulnerability segmentation hypothesis appears to be valid only when considering hydraulic failure at the entire needle level, including extra-xylary pathways. Our findings suggest that native embolism in needles is limited and highlight the importance of imaging techniques for vulnerability curves.
DOI: 10.1111/pce.12680
PubMed: 26574193
Affiliations:
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New insights from X-ray computed tomography.</title><author><name sortKey="Bouche, Pauline S" sort="Bouche, Pauline S" uniqKey="Bouche P" first="Pauline S" last="Bouche">Pauline S. Bouche</name><affiliation wicri:level="1"><nlm:affiliation>Institute for Systematic Botany and Ecology, Ulm University, D-89081, Ulm, Germany.</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institute for Systematic Botany and Ecology, Ulm University, D-89081, Ulm</wicri:regionArea><wicri:noRegion>89081, Ulm</wicri:noRegion><wicri:noRegion>89081, Ulm</wicri:noRegion><wicri:noRegion>Ulm</wicri:noRegion></affiliation></author><author><name sortKey="Delzon, Sylvain" sort="Delzon, Sylvain" uniqKey="Delzon S" first="Sylvain" last="Delzon">Sylvain Delzon</name><affiliation wicri:level="1"><nlm:affiliation>UMR1202 BIOGECO, INRA, F-33610, Cestas, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>UMR1202 BIOGECO, INRA, F-33610, Cestas</wicri:regionArea><wicri:noRegion>33610, Cestas</wicri:noRegion><wicri:noRegion>33610, Cestas</wicri:noRegion></affiliation></author><author><name sortKey="Choat, Brendan" sort="Choat, Brendan" uniqKey="Choat B" first="Brendan" last="Choat">Brendan Choat</name><affiliation wicri:level="1"><nlm:affiliation>Hawkesbury Institute for the Environment, University of Western Sydney, Richmond, New South Wales, 2753, Australia.</nlm:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Hawkesbury Institute for the Environment, University of Western Sydney, Richmond, New South Wales, 2753</wicri:regionArea><wicri:noRegion>2753</wicri:noRegion></affiliation></author><author><name sortKey="Badel, Eric" sort="Badel, Eric" uniqKey="Badel E" first="Eric" last="Badel">Eric Badel</name><affiliation wicri:level="1"><nlm:affiliation>INRA, UMR 457 PIAF, Clermont University, F-63100, Clermont-Ferrand, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>INRA, UMR 457 PIAF, Clermont University, F-63100, Clermont-Ferrand</wicri:regionArea><wicri:noRegion>63100, Clermont-Ferrand</wicri:noRegion><wicri:noRegion>63100, Clermont-Ferrand</wicri:noRegion></affiliation></author><author><name sortKey="Brodribb, Timothy J" sort="Brodribb, Timothy J" uniqKey="Brodribb T" first="Timothy J" last="Brodribb">Timothy J. Brodribb</name><affiliation wicri:level="1"><nlm:affiliation>School of Plant Science, University of Tasmania, Hobart, Tasmania, 7001, Australia.</nlm:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>School of Plant Science, University of Tasmania, Hobart, Tasmania, 7001</wicri:regionArea><wicri:noRegion>7001</wicri:noRegion></affiliation></author><author><name sortKey="Burlett, Regis" sort="Burlett, Regis" uniqKey="Burlett R" first="Regis" last="Burlett">Regis Burlett</name><affiliation wicri:level="1"><nlm:affiliation>UMR1202 BIOGECO, INRA, F-33610, Cestas, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>UMR1202 BIOGECO, INRA, F-33610, Cestas</wicri:regionArea><wicri:noRegion>33610, Cestas</wicri:noRegion><wicri:noRegion>33610, Cestas</wicri:noRegion></affiliation></author><author><name sortKey="Cochard, Herve" sort="Cochard, Herve" uniqKey="Cochard H" first="Hervé" last="Cochard">Hervé Cochard</name><affiliation wicri:level="1"><nlm:affiliation>INRA, UMR 457 PIAF, Clermont University, F-63100, Clermont-Ferrand, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>INRA, UMR 457 PIAF, Clermont University, F-63100, Clermont-Ferrand</wicri:regionArea><wicri:noRegion>63100, Clermont-Ferrand</wicri:noRegion><wicri:noRegion>63100, Clermont-Ferrand</wicri:noRegion></affiliation></author><author><name sortKey="Charra Vaskou, Katline" sort="Charra Vaskou, Katline" uniqKey="Charra Vaskou K" first="Katline" last="Charra-Vaskou">Katline Charra-Vaskou</name><affiliation wicri:level="1"><nlm:affiliation>INRA, UMR 457 PIAF, Clermont University, F-63100, Clermont-Ferrand, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>INRA, UMR 457 PIAF, Clermont University, F-63100, Clermont-Ferrand</wicri:regionArea><wicri:noRegion>63100, Clermont-Ferrand</wicri:noRegion><wicri:noRegion>63100, Clermont-Ferrand</wicri:noRegion></affiliation></author><author><name sortKey="Lavigne, Bruno" sort="Lavigne, Bruno" uniqKey="Lavigne B" first="Bruno" last="Lavigne">Bruno Lavigne</name><affiliation wicri:level="1"><nlm:affiliation>UMR1202 BIOGECO, INRA, F-33610, Cestas, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>UMR1202 BIOGECO, INRA, F-33610, Cestas</wicri:regionArea><wicri:noRegion>33610, Cestas</wicri:noRegion><wicri:noRegion>33610, Cestas</wicri:noRegion></affiliation></author><author><name sortKey="Li, Shan" sort="Li, Shan" uniqKey="Li S" first="Shan" last="Li">Shan Li</name><affiliation wicri:level="1"><nlm:affiliation>Institute for Systematic Botany and Ecology, Ulm University, D-89081, Ulm, Germany.</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institute for Systematic Botany and Ecology, Ulm University, D-89081, Ulm</wicri:regionArea><wicri:noRegion>89081, Ulm</wicri:noRegion><wicri:noRegion>89081, Ulm</wicri:noRegion><wicri:noRegion>Ulm</wicri:noRegion></affiliation></author><author><name sortKey="Mayr, Stefan" sort="Mayr, Stefan" uniqKey="Mayr S" first="Stefan" last="Mayr">Stefan Mayr</name><affiliation wicri:level="1"><nlm:affiliation>Department of Botany, University of Innsbruck, A-6020, Innsbruck, Austria.</nlm:affiliation><country xml:lang="fr">Autriche</country><wicri:regionArea>Department of Botany, University of Innsbruck, A-6020, Innsbruck</wicri:regionArea><wicri:noRegion>Innsbruck</wicri:noRegion></affiliation></author><author><name sortKey="Morris, Hugh" sort="Morris, Hugh" uniqKey="Morris H" first="Hugh" last="Morris">Hugh Morris</name><affiliation wicri:level="1"><nlm:affiliation>Institute for Systematic Botany and Ecology, Ulm University, D-89081, Ulm, Germany.</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institute for Systematic Botany and Ecology, Ulm University, D-89081, Ulm</wicri:regionArea><wicri:noRegion>89081, Ulm</wicri:noRegion><wicri:noRegion>89081, Ulm</wicri:noRegion><wicri:noRegion>Ulm</wicri:noRegion></affiliation></author><author><name sortKey="Torres Ruiz, Jose M" sort="Torres Ruiz, Jose M" uniqKey="Torres Ruiz J" first="José M" last="Torres-Ruiz">José M. Torres-Ruiz</name><affiliation wicri:level="1"><nlm:affiliation>UMR1202 BIOGECO, INRA, F-33610, Cestas, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>UMR1202 BIOGECO, INRA, F-33610, Cestas</wicri:regionArea><wicri:noRegion>33610, Cestas</wicri:noRegion><wicri:noRegion>33610, Cestas</wicri:noRegion></affiliation></author><author><name sortKey="Zufferey, Vivian" sort="Zufferey, Vivian" uniqKey="Zufferey V" first="Vivian" last="Zufferey">Vivian Zufferey</name><affiliation wicri:level="1"><nlm:affiliation>Institut des sciences en production végétale IPV, Agroscope, CH-1260, Nyon, Switzerland.</nlm:affiliation><country xml:lang="fr">Suisse</country><wicri:regionArea>Institut des sciences en production végétale IPV, Agroscope, CH-1260, Nyon</wicri:regionArea><wicri:noRegion>Nyon</wicri:noRegion></affiliation></author><author><name sortKey="Jansen, Steven" sort="Jansen, Steven" uniqKey="Jansen S" first="Steven" last="Jansen">Steven Jansen</name><affiliation wicri:level="1"><nlm:affiliation>Institute for Systematic Botany and Ecology, Ulm University, D-89081, Ulm, Germany.</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institute for Systematic Botany and Ecology, Ulm University, D-89081, Ulm</wicri:regionArea><wicri:noRegion>89081, Ulm</wicri:noRegion><wicri:noRegion>89081, Ulm</wicri:noRegion><wicri:noRegion>Ulm</wicri:noRegion></affiliation></author></analytic><series><title level="j">Plant, cell & environment</title><idno type="eISSN">1365-3040</idno><imprint><date when="2016" type="published">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Dehydration</term><term>Pinus (physiology)</term><term>Plant Leaves (physiology)</term><term>Plant Stems (anatomy & histology)</term><term>Plant Stems (physiology)</term><term>Tomography, X-Ray Computed (methods)</term><term>Trees (physiology)</term><term>Xylem (anatomy & histology)</term><term>Xylem (physiology)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Arbres (physiologie)</term><term>Déshydratation</term><term>Feuilles de plante (physiologie)</term><term>Pinus (physiologie)</term><term>Tiges de plante (anatomie et histologie)</term><term>Tiges de plante (physiologie)</term><term>Tomodensitométrie ()</term><term>Xylème (anatomie et histologie)</term><term>Xylème (physiologie)</term></keywords><keywords scheme="MESH" qualifier="anatomie et histologie" xml:lang="fr"><term>Tiges de plante</term><term>Xylème</term></keywords><keywords scheme="MESH" qualifier="anatomy & histology" xml:lang="en"><term>Plant Stems</term><term>Xylem</term></keywords><keywords scheme="MESH" qualifier="methods" xml:lang="en"><term>Tomography, X-Ray Computed</term></keywords><keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Arbres</term><term>Feuilles de plante</term><term>Pinus</term><term>Tiges de plante</term><term>Xylème</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Pinus</term><term>Plant Leaves</term><term>Plant Stems</term><term>Trees</term><term>Xylem</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Dehydration</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Déshydratation</term><term>Tomodensitométrie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Plants can be highly segmented organisms with an independently redundant design of organs. In the context of plant hydraulics, leaves may be less embolism resistant than stems, allowing hydraulic failure to be restricted to distal organs that can be readily replaced. We quantified drought-induced embolism in needles and stems of Pinus pinaster using high-resolution computed tomography (HRCT). HRCT observations of needles were compared with the rehydration kinetics method to estimate the contribution of extra-xylary pathways to declining hydraulic conductance. High-resolution computed tomography images indicated that the pressure inducing 50% of embolized tracheids was similar between needle and stem xylem (P50 needle xylem = -3.62 MPa, P50 stem xylem = -3.88 MPa). Tracheids in both organs showed no difference in torus overlap of bordered pits. However, estimations of the pressure inducing 50% loss of hydraulic conductance at the whole needle level by the rehydration kinetics method were significantly higher (P50 needle = -1.71 MPa) than P50 needle xylem derived from HRCT. The vulnerability segmentation hypothesis appears to be valid only when considering hydraulic failure at the entire needle level, including extra-xylary pathways. Our findings suggest that native embolism in needles is limited and highlight the importance of imaging techniques for vulnerability curves.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Australie</li><li>Autriche</li><li>France</li><li>Suisse</li></country></list><tree><country name="Allemagne"><noRegion><name sortKey="Bouche, Pauline S" sort="Bouche, Pauline S" uniqKey="Bouche P" first="Pauline S" last="Bouche">Pauline S. Bouche</name></noRegion><name sortKey="Jansen, Steven" sort="Jansen, Steven" uniqKey="Jansen S" first="Steven" last="Jansen">Steven Jansen</name><name sortKey="Li, Shan" sort="Li, Shan" uniqKey="Li S" first="Shan" last="Li">Shan Li</name><name sortKey="Morris, Hugh" sort="Morris, Hugh" uniqKey="Morris H" first="Hugh" last="Morris">Hugh Morris</name></country><country name="France"><noRegion><name sortKey="Delzon, Sylvain" sort="Delzon, Sylvain" uniqKey="Delzon S" first="Sylvain" last="Delzon">Sylvain Delzon</name></noRegion><name sortKey="Badel, Eric" sort="Badel, Eric" uniqKey="Badel E" first="Eric" last="Badel">Eric Badel</name><name sortKey="Burlett, Regis" sort="Burlett, Regis" uniqKey="Burlett R" first="Regis" last="Burlett">Regis Burlett</name><name sortKey="Charra Vaskou, Katline" sort="Charra Vaskou, Katline" uniqKey="Charra Vaskou K" first="Katline" last="Charra-Vaskou">Katline Charra-Vaskou</name><name sortKey="Cochard, Herve" sort="Cochard, Herve" uniqKey="Cochard H" first="Hervé" last="Cochard">Hervé Cochard</name><name sortKey="Lavigne, Bruno" sort="Lavigne, Bruno" uniqKey="Lavigne B" first="Bruno" last="Lavigne">Bruno Lavigne</name><name sortKey="Torres Ruiz, Jose M" sort="Torres Ruiz, Jose M" uniqKey="Torres Ruiz J" first="José M" last="Torres-Ruiz">José M. Torres-Ruiz</name></country><country name="Australie"><noRegion><name sortKey="Choat, Brendan" sort="Choat, Brendan" uniqKey="Choat B" first="Brendan" last="Choat">Brendan Choat</name></noRegion><name sortKey="Brodribb, Timothy J" sort="Brodribb, Timothy J" uniqKey="Brodribb T" first="Timothy J" last="Brodribb">Timothy J. Brodribb</name></country><country name="Autriche"><noRegion><name sortKey="Mayr, Stefan" sort="Mayr, Stefan" uniqKey="Mayr S" first="Stefan" last="Mayr">Stefan Mayr</name></noRegion></country><country name="Suisse"><noRegion><name sortKey="Zufferey, Vivian" sort="Zufferey, Vivian" uniqKey="Zufferey V" first="Vivian" last="Zufferey">Vivian Zufferey</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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