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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Hydraulic Failure Defines the Recovery and Point of Death in Water-Stressed Conifers<xref ref-type="fn" rid="fn1">[OA]</xref></title><author><name sortKey="Brodribb, Tim J" sort="Brodribb, Tim J" uniqKey="Brodribb T" first="Tim J." last="Brodribb">Tim J. Brodribb</name></author><author><name sortKey="Cochard, Herve" sort="Cochard, Herve" uniqKey="Cochard H" first="Hervé" last="Cochard">Hervé Cochard</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">19011001</idno><idno type="pmc">2613726</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2613726</idno><idno type="RBID">PMC:2613726</idno><idno type="doi">10.1104/pp.108.129783</idno><date when="2009">2009</date><idno type="wicri:Area/Pmc/Corpus">001059</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">001059</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Hydraulic Failure Defines the Recovery and Point of Death in Water-Stressed Conifers<xref ref-type="fn" rid="fn1">[OA]</xref></title><author><name sortKey="Brodribb, Tim J" sort="Brodribb, Tim J" uniqKey="Brodribb T" first="Tim J." last="Brodribb">Tim J. Brodribb</name></author><author><name sortKey="Cochard, Herve" sort="Cochard, Herve" uniqKey="Cochard H" first="Hervé" last="Cochard">Hervé Cochard</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="2009">2009</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>This study combines existing hydraulic principles with recently developed methods for probing leaf hydraulic function to determine whether xylem physiology can explain the dynamic response of gas exchange both during drought and in the recovery phase after rewatering. Four conifer species from wet and dry forests were exposed to a range of water stresses by withholding water and then rewatering to observe the recovery process. During both phases midday transpiration and leaf water potential (Ψ<sub>leaf</sub>) were monitored. Stomatal responses to Ψ<sub>leaf</sub> were established for each species and these relationships used to evaluate whether the recovery of gas exchange after drought was limited by postembolism hydraulic repair in leaves. Furthermore, the timing of gas-exchange recovery was used to determine the maximum survivable water stress for each species and this index compared with data for both leaf and stem vulnerability to water-stress-induced dysfunction measured for each species. Recovery of gas exchange after water stress took between 1 and >100 d and during this period all species showed strong 1:1 conformity to a combined hydraulic-stomatal limitation model (<italic>r</italic><sup>2</sup> = 0.70 across all plants). Gas-exchange recovery time showed two distinct phases, a rapid overnight recovery in plants stressed to <50% loss of leaf hydraulic conductance (<italic>K</italic><sub>leaf</sub>) and a highly Ψ<sub>leaf</sub>-dependent phase in plants stressed to >50% loss of <italic>K</italic><sub>leaf</sub>. Maximum recoverable water stress (Ψ<sub>min</sub>) corresponded to a 95% loss of <italic>K</italic><sub>leaf</sub>. Thus, we conclude that xylem hydraulics represents a direct limit to the drought tolerance of these conifer species.</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="publisher-id">plantphysiol</journal-id><journal-title>Plant Physiology</journal-title><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">19011001</article-id><article-id pub-id-type="pmc">2613726</article-id><article-id pub-id-type="publisher-id">129783</article-id><article-id pub-id-type="doi">10.1104/pp.108.129783</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject><subj-group><subject>Whole Plant and Ecophysiology</subject></subj-group></subj-group></article-categories><title-group><article-title>Hydraulic Failure Defines the Recovery and Point of Death in Water-Stressed Conifers<xref ref-type="fn" rid="fn1">[OA]</xref></article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Brodribb</surname><given-names>Tim J.</given-names></name><xref ref-type="corresp" rid="cor1">*</xref></contrib><contrib contrib-type="author"><name><surname>Cochard</surname><given-names>Hervé</given-names></name></contrib></contrib-group><aff id="N0x1f3cce0N0x1fb37a0">University of Tasmania, Hobart, Tasmania 7001, Australia (T.J.B.); INRA, UMR 547 PIAF, F–63100 Clermont-Ferrand, France (H.C.); and Université Blaise Pascal, UMR 547 PIAF, F–63177 Aubière, France (H.C.)</aff><author-notes><fn id="cor1"><label>*</label><p>Corresponding author; e-mail <email>timothyb@utas.edu.au</email>.</p></fn></author-notes><pub-date pub-type="ppub"><month>1</month><year>2009</year></pub-date><volume>149</volume><issue>1</issue><fpage>575</fpage><lpage>584</lpage><history><date date-type="received"><day>10</day><month>9</month><year>2008</year></date><date date-type="accepted"><day>11</day><month>11</month><year>2008</year></date></history><permissions><copyright-statement>Copyright © 2009, American Society of Plant Biologists</copyright-statement></permissions><abstract><p>This study combines existing hydraulic principles with recently developed methods for probing leaf hydraulic function to determine whether xylem physiology can explain the dynamic response of gas exchange both during drought and in the recovery phase after rewatering. Four conifer species from wet and dry forests were exposed to a range of water stresses by withholding water and then rewatering to observe the recovery process. During both phases midday transpiration and leaf water potential (Ψ<sub>leaf</sub>) were monitored. Stomatal responses to Ψ<sub>leaf</sub> were established for each species and these relationships used to evaluate whether the recovery of gas exchange after drought was limited by postembolism hydraulic repair in leaves. Furthermore, the timing of gas-exchange recovery was used to determine the maximum survivable water stress for each species and this index compared with data for both leaf and stem vulnerability to water-stress-induced dysfunction measured for each species. Recovery of gas exchange after water stress took between 1 and >100 d and during this period all species showed strong 1:1 conformity to a combined hydraulic-stomatal limitation model (<italic>r</italic><sup>2</sup> = 0.70 across all plants). Gas-exchange recovery time showed two distinct phases, a rapid overnight recovery in plants stressed to <50% loss of leaf hydraulic conductance (<italic>K</italic><sub>leaf</sub>) and a highly Ψ<sub>leaf</sub>-dependent phase in plants stressed to >50% loss of <italic>K</italic><sub>leaf</sub>. Maximum recoverable water stress (Ψ<sub>min</sub>) corresponded to a 95% loss of <italic>K</italic><sub>leaf</sub>. Thus, we conclude that xylem hydraulics represents a direct limit to the drought tolerance of these conifer species.</p></abstract></article-meta><notes><fn-group><fn><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="www.plantphysiol.org">www.plantphysiol.org</ext-link>) is: Tim J. Brodribb (<email>timothyb@utas.edu.au</email>).</p></fn><fn id="fn1"><label>[OA]</label><p>Open Access articles can be viewed online without a subscription.</p></fn><fn><p><ext-link ext-link-type="uri" xlink:href="www.plantphysiol.org/cgi/doi/10.1104/pp.108.129783">www.plantphysiol.org/cgi/doi/10.1104/pp.108.129783</ext-link></p></fn></fn-group></notes></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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