The oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment?
Identifieur interne : 002651 ( Pmc/Curation ); précédent : 002650; suivant : 002652The oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment?
Auteurs : Arthur Gessler [Allemagne, France] ; Elke Brandes [France] ; Claudia Keitel [Australie] ; Sonja Boda [Suisse] ; Zachary E. Kayler [Allemagne] ; André Granier [France] ; Margaret Barbour [Australie] ; Graham D. Farquhar ; Kerstin Treydte [Suisse]Source :
- The New Phytologist [ 0028-646X ] ; 2013.
Abstract
The oxygen stable isotope composition of plant organic matter (OM) (particularly of wood and cellulose in the tree ring archive) is valuable in studies of plant–climate interaction, but there is a lack of information on the transfer of the isotope signal from the leaf to heterotrophic tissues. We studied the oxygen isotopic composition and its enrichment above source water of leaf water over diel courses in five tree species covering a broad range of life forms. We tracked the transfer of the isotopic signal to leaf water-soluble OM and further to phloem-transported OM. Observed leaf water evaporative enrichment was consistent with values predicted from mechanistic models taking into account nonsteady-state conditions. While leaf water-soluble OM showed the expected 18O enrichment in all species, phloem sugars were less enriched than expected from leaf water enrichment in Scots pine ( Oxygen atom exchange with nonenriched water during phloem loading and transport, as well as a significant contribution of assimilates from bark photosynthesis, can explain these phloem 18O enrichment patterns. Our results indicate species-specific uncoupling between the leaf water and the OM oxygen isotope signal, which is important for the interpretation of tree ring data.
Url:
DOI: 10.1111/nph.12359
PubMed: 23763637
PubMed Central: 3902987
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<front><div type="abstract" xml:lang="en"><p><list list-type="bullet"><list-item><p>The oxygen stable isotope composition of plant organic matter (OM) (particularly of wood and cellulose in the tree ring archive) is valuable in studies of plant–climate interaction, but there is a lack of information on the transfer of the isotope signal from the leaf to heterotrophic tissues.</p>
</list-item>
<list-item><p>We studied the oxygen isotopic composition and its enrichment above source water of leaf water over diel courses in five tree species covering a broad range of life forms. We tracked the transfer of the isotopic signal to leaf water-soluble OM and further to phloem-transported OM.</p>
</list-item>
<list-item><p>Observed leaf water evaporative enrichment was consistent with values predicted from mechanistic models taking into account nonsteady-state conditions. While leaf water-soluble OM showed the expected <sup>18</sup>
O enrichment in all species, phloem sugars were less enriched than expected from leaf water enrichment in Scots pine (<italic>Pinus sylvestris</italic>
), European larch (<italic>Larix decidua</italic>
) and Alpine ash (<italic>Eucalyptus delegatensis</italic>
).</p>
</list-item>
<list-item><p>Oxygen atom exchange with nonenriched water during phloem loading and transport, as well as a significant contribution of assimilates from bark photosynthesis, can explain these phloem <sup>18</sup>
O enrichment patterns. Our results indicate species-specific uncoupling between the leaf water and the OM oxygen isotope signal, which is important for the interpretation of tree ring data.</p>
</list-item>
</list>
</p>
</div>
</front>
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</TEI>
<pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">New Phytol</journal-id>
<journal-id journal-id-type="iso-abbrev">New Phytol</journal-id>
<journal-id journal-id-type="publisher-id">nph</journal-id>
<journal-title-group><journal-title>The New Phytologist</journal-title>
</journal-title-group>
<issn pub-type="ppub">0028-646X</issn>
<issn pub-type="epub">1469-8137</issn>
<publisher><publisher-name>Blackwell Publishing Ltd</publisher-name>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">23763637</article-id>
<article-id pub-id-type="pmc">3902987</article-id>
<article-id pub-id-type="doi">10.1111/nph.12359</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Research</subject>
</subj-group>
</article-categories>
<title-group><article-title>The oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment?</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Gessler</surname>
<given-names>Arthur</given-names>
</name>
<xref ref-type="aff" rid="au1">1</xref>
<xref ref-type="aff" rid="au2">2</xref>
<xref ref-type="aff" rid="au3">3</xref>
<xref ref-type="corresp" rid="cor1"></xref>
</contrib>
<contrib contrib-type="author"><name><surname>Brandes</surname>
<given-names>Elke</given-names>
</name>
<xref ref-type="aff" rid="au2">2</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Keitel</surname>
<given-names>Claudia</given-names>
</name>
<xref ref-type="aff" rid="au3">3</xref>
<xref ref-type="aff" rid="au4">4</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Boda</surname>
<given-names>Sonja</given-names>
</name>
<xref ref-type="aff" rid="au5">5</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Kayler</surname>
<given-names>Zachary E</given-names>
</name>
<xref ref-type="aff" rid="au1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Granier</surname>
<given-names>André</given-names>
</name>
<xref ref-type="aff" rid="au2">2</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Barbour</surname>
<given-names>Margaret</given-names>
</name>
<xref ref-type="aff" rid="au4">4</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Farquhar</surname>
<given-names>Graham D</given-names>
</name>
<xref ref-type="aff" rid="au3">3</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Treydte</surname>
<given-names>Kerstin</given-names>
</name>
<xref ref-type="aff" rid="au5">5</xref>
</contrib>
<aff id="au1"><label>1</label>
<institution>Leibniz Centre for Agricultural Landscape Research, Institute for Landscape Biogeochemistry</institution>
<addr-line>Eberswalderstr. 84, 15374, Müncheberg, Germany</addr-line>
</aff>
<aff id="au2"><label>2</label>
<institution>INRA, UMR 1137 Ecologie et Ecophysiologie Forestières INRA/Université de Lorraine</institution>
<addr-line>54280, Champenoux, France</addr-line>
</aff>
<aff id="au3"><label>3</label>
<institution>Research School of Biology, Australian National University</institution>
<addr-line>Building 46, Acton, ACT, 0200, Autralia</addr-line>
</aff>
<aff id="au4"><label>4</label>
<institution>Faculty of Agriculture and Environment, University of Sydney</institution>
<addr-line>Private Bag 4011, Narellan, NSW, 2567, Australia</addr-line>
</aff>
<aff id="au5"><label>5</label>
<institution>Swiss Federal Research Institute WSL, Research Unit Landscape Dynamics</institution>
<addr-line>Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland</addr-line>
</aff>
</contrib-group>
<author-notes><corresp id="cor1">Author for correspondence: Arthur Gessler Tel: +49 33432 82 326 Email: <email>gessler@zalf.de</email>
</corresp>
</author-notes>
<pub-date pub-type="ppub"><month>10</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub"><day>13</day>
<month>6</month>
<year>2013</year>
</pub-date>
<volume>200</volume>
<issue>1</issue>
<fpage>144</fpage>
<lpage>157</lpage>
<history><date date-type="received"><day>27</day>
<month>2</month>
<year>2013</year>
</date>
<date date-type="accepted"><day>09</day>
<month>5</month>
<year>2013</year>
</date>
</history>
<permissions><copyright-statement>© 2013 The Authors New Phytologist © 2013 New Phytologist Trust</copyright-statement>
<copyright-year>2013</copyright-year>
<license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/3.0/"><license-p>This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.</license-p>
</license>
</permissions>
<abstract><p><list list-type="bullet"><list-item><p>The oxygen stable isotope composition of plant organic matter (OM) (particularly of wood and cellulose in the tree ring archive) is valuable in studies of plant–climate interaction, but there is a lack of information on the transfer of the isotope signal from the leaf to heterotrophic tissues.</p>
</list-item>
<list-item><p>We studied the oxygen isotopic composition and its enrichment above source water of leaf water over diel courses in five tree species covering a broad range of life forms. We tracked the transfer of the isotopic signal to leaf water-soluble OM and further to phloem-transported OM.</p>
</list-item>
<list-item><p>Observed leaf water evaporative enrichment was consistent with values predicted from mechanistic models taking into account nonsteady-state conditions. While leaf water-soluble OM showed the expected <sup>18</sup>
O enrichment in all species, phloem sugars were less enriched than expected from leaf water enrichment in Scots pine (<italic>Pinus sylvestris</italic>
), European larch (<italic>Larix decidua</italic>
) and Alpine ash (<italic>Eucalyptus delegatensis</italic>
).</p>
</list-item>
<list-item><p>Oxygen atom exchange with nonenriched water during phloem loading and transport, as well as a significant contribution of assimilates from bark photosynthesis, can explain these phloem <sup>18</sup>
O enrichment patterns. Our results indicate species-specific uncoupling between the leaf water and the OM oxygen isotope signal, which is important for the interpretation of tree ring data.</p>
</list-item>
</list>
</p>
</abstract>
<kwd-group><kwd>broadleaf</kwd>
<kwd>conifer</kwd>
<kwd>diel course</kwd>
<kwd>oxygen atom exchange</kwd>
<kwd>phloem transport</kwd>
</kwd-group>
</article-meta>
</front>
</pmc>
</record>
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