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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Phloem as Capacitor: Radial Transfer of Water into Xylem of Tree Stems Occurs via Symplastic Transport in Ray Parenchyma<xref ref-type="fn" rid="fn1"><sup>[OPEN]</sup></xref></title><author><name sortKey="Pfautsch, Sebastian" sort="Pfautsch, Sebastian" uniqKey="Pfautsch S" first="Sebastian" last="Pfautsch">Sebastian Pfautsch</name></author><author><name sortKey="Renard, Justine" sort="Renard, Justine" uniqKey="Renard J" first="Justine" last="Renard">Justine Renard</name></author><author><name sortKey="Tjoelker, Mark G" sort="Tjoelker, Mark G" uniqKey="Tjoelker M" first="Mark G." last="Tjoelker">Mark G. Tjoelker</name></author><author><name sortKey="Salih, Anya" sort="Salih, Anya" uniqKey="Salih A" first="Anya" last="Salih">Anya Salih</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">25588734</idno><idno type="pmc">4348778</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4348778</idno><idno type="RBID">PMC:4348778</idno><idno type="doi">10.1104/pp.114.254581</idno><date when="2015">2015</date><idno type="wicri:Area/Pmc/Corpus">001A79</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">001A79</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Phloem as Capacitor: Radial Transfer of Water into Xylem of Tree Stems Occurs via Symplastic Transport in Ray Parenchyma<xref ref-type="fn" rid="fn1"><sup>[OPEN]</sup></xref></title><author><name sortKey="Pfautsch, Sebastian" sort="Pfautsch, Sebastian" uniqKey="Pfautsch S" first="Sebastian" last="Pfautsch">Sebastian Pfautsch</name></author><author><name sortKey="Renard, Justine" sort="Renard, Justine" uniqKey="Renard J" first="Justine" last="Renard">Justine Renard</name></author><author><name sortKey="Tjoelker, Mark G" sort="Tjoelker, Mark G" uniqKey="Tjoelker M" first="Mark G." last="Tjoelker">Mark G. Tjoelker</name></author><author><name sortKey="Salih, Anya" sort="Salih, Anya" uniqKey="Salih A" first="Anya" last="Salih">Anya Salih</name></author></analytic><series><title level="j">Plant Physiology</title><idno type="ISSN">0032-0889</idno><idno type="eISSN">1532-2548</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Visual evidence for the radial transfer of water from phloem into xylem supports theoretical predictions that phloem acts as a water storage capacitor in tree stems.</p></div></front></TEI><pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Plant Physiol</journal-id><journal-id journal-id-type="iso-abbrev">Plant Physiol</journal-id><journal-id journal-id-type="hwp">plantphysiol</journal-id><journal-id journal-id-type="publisher-id">aspb</journal-id><journal-title-group><journal-title>Plant Physiology</journal-title></journal-title-group><issn pub-type="ppub">0032-0889</issn><issn pub-type="epub">1532-2548</issn><publisher><publisher-name>American Society of Plant Biologists</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">25588734</article-id><article-id pub-id-type="pmc">4348778</article-id><article-id pub-id-type="publisher-id">254581</article-id><article-id pub-id-type="doi">10.1104/pp.114.254581</article-id><article-categories><subj-group subj-group-type="heading"><subject>Articles</subject><subj-group subj-group-type="heading"><subject>Membranes, Transport, and Bioenergetics</subject></subj-group></subj-group></article-categories><title-group><article-title>Phloem as Capacitor: Radial Transfer of Water into Xylem of Tree Stems Occurs via Symplastic Transport in Ray Parenchyma<xref ref-type="fn" rid="fn1"><sup>[OPEN]</sup></xref></article-title></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">http://orcid.org/0000-0002-4390-4195</contrib-id><name><surname>Pfautsch</surname><given-names>Sebastian</given-names></name><xref ref-type="corresp" rid="cor1">*</xref></contrib><contrib contrib-type="author"><name><surname>Renard</surname><given-names>Justine</given-names></name></contrib><contrib contrib-type="author"><name><surname>Tjoelker</surname><given-names>Mark G.</given-names></name></contrib><contrib contrib-type="author"><name><surname>Salih</surname><given-names>Anya</given-names></name></contrib><aff id="aff1">Hawkesbury Institute for the Environment, University of Western Sydney, Penrith, New South Wales 2751, Australia (S.P., M.G.T.);</aff><aff id="aff2">École Normale Supérieure, 75005 Paris, France (J.R.); and</aff><aff id="aff3">Confocal Bio-Imaging Facility, Hawkesbury Campus, Deputy Vice-Chancellor (Research and Development) Division, University of Western Sydney, Penrith South, New South Wales 1797, Australia (A.S.)</aff></contrib-group><author-notes><fn><p><ext-link ext-link-type="uri" xlink:href="http://www.plantphysiol.org/cgi/doi/10.1104/pp.114.254581">www.plantphysiol.org/cgi/doi/10.1104/pp.114.254581</ext-link></p></fn><corresp id="cor1"><label>*</label>Address correspondence to <email>s.pfautsch@uws.edu.au</email>.</corresp><fn id="afn1"><p>The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (<ext-link ext-link-type="uri" xlink:href="http://www.plantphysiol.org">www.plantphysiol.org</ext-link>) is: Sebastian Pfautsch (<email>s.pfautsch@uws.edu.au</email>).</p></fn></author-notes><pmc-comment>Fake ppub date generated by PMC from publisher pub-date/@pub-type='epub-ppub' </pmc-comment>
<pub-date pub-type="ppub"><month>3</month><year>2015</year></pub-date><pub-date pub-type="epub"><day>14</day><month>1</month><year>2015</year></pub-date><pub-date pub-type="pmc-release"><day>14</day><month>1</month><year>2015</year></pub-date><pmc-comment> PMC Release delay is 0 months and 0 days and was based on the
<volume>167</volume><issue>3</issue><fpage>963</fpage><lpage>971</lpage><history><date date-type="received"><day>28</day><month>11</month><year>2014</year></date><date date-type="accepted"><day>12</day><month>1</month><year>2015</year></date></history><permissions><copyright-statement>© 2015 American Society of Plant Biologists. All Rights Reserved.</copyright-statement><copyright-year>2015</copyright-year></permissions><self-uri xlink:role="icon" xlink:href="PP_254581_ic1.gif"></self-uri><self-uri content-type="alt-lang-pdf zh" xlink:href="963.chinese.pdf"></self-uri><abstract abstract-type="precis"><p>Visual evidence for the radial transfer of water from phloem into xylem supports theoretical predictions that phloem acts as a water storage capacitor in tree stems.</p></abstract><abstract><p>The transfer of water from phloem into xylem is thought to mitigate increasing hydraulic tension in the vascular system of trees during the diel cycle of transpiration. Although a putative plant function, to date there is no direct evidence of such water transfer or the contributing pathways. Here, we trace the radial flow of water from the phloem into the xylem and investigate its diel variation. Introducing a fluorescent dye (0.1% [w/w] fluorescein) into the phloem water of the tree species <italic>Eucalyptus saligna</italic> allowed localization of the dye in phloem and xylem tissues using confocal laser scanning microscopy. Our results show that the majority of water transferred between the two tissues is facilitated via the symplast of horizontal ray parenchyma cells. The method also permitted assessment of the radial transfer of water during the diel cycle, where changes in water potential gradients between phloem and xylem determine the extent and direction of radial transfer. When injected during the morning, when xylem water potential rapidly declined, fluorescein was translocated, on average, farther into mature xylem (447 ± 188 µm) compared with nighttime, when xylem water potential was close to zero (155 ± 42 µm). These findings provide empirical evidence to support theoretical predictions of the role of phloem-xylem water transfer in the hydraulic functioning of plants. This method enables investigation of the role of phloem tissue as a dynamic capacitor for water storage and transfer and its contribution toward the maintenance of the functional integrity of xylem in trees.</p></abstract><counts><page-count count="9"></page-count></counts><custom-meta-group><custom-meta><meta-name> DJS Export </meta-name><meta-value>v1</meta-value></custom-meta></custom-meta-group></article-meta><notes><glossary><title>Glossary</title><def-list><def-item><term id="term1">ψ</term><def id="def1"><p>water potential</p></def></def-item><def-item><term id="term2">ψ<sub>L</sub></term><def id="def2"><p>leaf water potential</p></def></def-item><def-item><term id="term3">PAR</term><def id="def3"><p>photosynthetically active radiation</p></def></def-item><def-item><term id="term4">VPD</term><def id="def4"><p>vapor pressure deficit</p></def></def-item></def-list></glossary></notes></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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