Daytime Depression in Tree Stem CO2 Efflux Rates: Is it Caused by Low Stem Turgor Pressure?
Identifieur interne : 000134 ( Pmc/Curation ); précédent : 000133; suivant : 000135Daytime Depression in Tree Stem CO2 Efflux Rates: Is it Caused by Low Stem Turgor Pressure?
Auteurs : An Saveyn ; Kathy Steppe ; Raoul LemeurSource :
- Annals of Botany [ 0305-7364 ] ; 2007.
Abstract
Daytime CO2 efflux rates (
There was a strong correspondence between fluctuations in
Daytime depressions in stem
Url:
DOI: 10.1093/aob/mcl268
PubMed: 17204535
PubMed Central: 2802950
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Daytime Depression in Tree Stem CO<sub>2</sub> Efflux Rates: Is it Caused by Low Stem Turgor Pressure?</title><author><name sortKey="Saveyn, An" sort="Saveyn, An" uniqKey="Saveyn A" first="An" last="Saveyn">An Saveyn</name></author><author><name sortKey="Steppe, Kathy" sort="Steppe, Kathy" uniqKey="Steppe K" first="Kathy" last="Steppe">Kathy Steppe</name></author><author><name sortKey="Lemeur, Raoul" sort="Lemeur, Raoul" uniqKey="Lemeur R" first="Raoul" last="Lemeur">Raoul Lemeur</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">17204535</idno><idno type="pmc">2802950</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2802950</idno><idno type="RBID">PMC:2802950</idno><idno type="doi">10.1093/aob/mcl268</idno><date when="2007">2007</date><idno type="wicri:Area/Pmc/Corpus">000134</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000134</idno><idno type="wicri:Area/Pmc/Curation">000134</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Curation">000134</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Daytime Depression in Tree Stem CO<sub>2</sub> Efflux Rates: Is it Caused by Low Stem Turgor Pressure?</title><author><name sortKey="Saveyn, An" sort="Saveyn, An" uniqKey="Saveyn A" first="An" last="Saveyn">An Saveyn</name></author><author><name sortKey="Steppe, Kathy" sort="Steppe, Kathy" uniqKey="Steppe K" first="Kathy" last="Steppe">Kathy Steppe</name></author><author><name sortKey="Lemeur, Raoul" sort="Lemeur, Raoul" uniqKey="Lemeur R" first="Raoul" last="Lemeur">Raoul Lemeur</name></author></analytic><series><title level="j">Annals of Botany</title><idno type="ISSN">0305-7364</idno><idno type="eISSN">1095-8290</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Background and Aims</title><p>Daytime CO<sub>2</sub> efflux rates (<italic>F</italic><sub>CO2</sub>) from tree stems are often reported to be lower than expected from the exponential relationship between temperature and respiration. Explanations of daytime depression in <italic>F</italic><sub>CO2</sub> have focused on the possible role of internal CO<sub>2</sub> transport in the xylem. However, another possible cause that has been overlooked is the daily dynamics of the water status in the living stem tissues and its influence on stem growth rate and thus respiration. The objective of this study was to assess the daily dynamics of stem water status and growth rate and to determine the extent to which they may be linked to daily variations in stem <italic>F</italic><sub>CO2</sub>.</p></sec><sec><title>Methods</title><p><italic>F</italic><sub>CO2</sub> of young beech and oak stems were measured under controlled conditions. Relative stem turgor pressure (<italic>Ψ</italic><sub>p</sub>), obtained from simulations with the ‘RCGro’ model, was used as an indicator of the water status in the living stem tissues. Daily dynamics of stem growth were derived from <italic>Ψ</italic><sub>p</sub>: growth was assumed to occur when <italic>Ψ</italic><sub>p</sub> exceeded a relative threshold value.</p></sec><sec><title>Key Results</title><p>There was a strong correspondence between fluctuations in <italic>F</italic><sub>CO2</sub> and simulated <italic>Ψ</italic><sub>p</sub>. The non-growth conditions during daytime coincided with depressions in <italic>F</italic><sub>CO2</sub>. Moreover, <italic>F</italic><sub>CO2</sub> responded to changes in <italic>Ψ</italic><sub>p</sub> in the absence of growth, indicating also that maintenance processes were influenced by the water status in the living stem tissues.</p></sec><sec><title>Conclusions</title><p>Daytime depressions in stem <italic>F</italic><sub>CO2</sub> correlate with the daily dynamics of turgor, as a measure of the water status in the living stem tissues: it is suggested that water status of tree stems is a potentially important determinant of stem <italic>F</italic><sub>CO2</sub>, as it influences the rate of growth and maintenance processes in the living tissues of the stem.</p></sec></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">Ann Bot</journal-id><journal-id journal-id-type="publisher-id">Annals of Botany</journal-id><journal-title-group><journal-title>Annals of Botany</journal-title></journal-title-group><issn pub-type="ppub">0305-7364</issn><issn pub-type="epub">1095-8290</issn><publisher><publisher-name>Oxford University Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">17204535</article-id><article-id pub-id-type="pmc">2802950</article-id><article-id pub-id-type="doi">10.1093/aob/mcl268</article-id><article-id pub-id-type="publisher-id">mcl268</article-id><article-categories><subj-group subj-group-type="heading"><subject>Original Articles</subject></subj-group></article-categories><title-group><article-title>Daytime Depression in Tree Stem CO<sub>2</sub> Efflux Rates: Is it Caused by Low Stem Turgor Pressure?</article-title><alt-title alt-title-type="left-running"><italic>Saveyn</italic> et al. — <italic>Stem CO<sub>2</sub> Efflux in Relation to Stem Turgor</italic></alt-title><alt-title alt-title-type="right-running"><italic>Saveyn</italic> et al. — <italic>Stem CO<sub>2</sub> Efflux in Relation to Stem Turgor</italic></alt-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Saveyn</surname><given-names>An</given-names></name><xref ref-type="corresp" rid="cor1">*</xref></contrib><contrib contrib-type="author"><name><surname>Steppe</surname><given-names>Kathy</given-names></name></contrib><contrib contrib-type="author"><name><surname>Lemeur</surname><given-names>Raoul</given-names></name></contrib></contrib-group><aff><addr-line>Applied Ecology and Environmental Biology</addr-line>,<institution>Ghent University</institution>,<addr-line>Coupure Links 653, Ghent, 9000</addr-line>,<country>Belgium</country></aff><author-notes><corresp id="cor1"><label>*</label>For correspondence. E-mail <email>an.saveyn@UGent.be</email></corresp></author-notes><pub-date pub-type="ppub"><month>3</month><year>2007</year></pub-date><pub-date pub-type="epub"><day>4</day><month>1</month><year>2007</year></pub-date><volume>99</volume><issue>3</issue><fpage>477</fpage><lpage>485</lpage><history><date date-type="received"><day>31</day><month>8</month><year>2006</year></date><date date-type="rev-request"><day>19</day><month>10</month><year>2006</year></date><date date-type="accepted"><day>31</day><month>10</month><year>2006</year></date></history><permissions><copyright-statement>© The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org</copyright-statement></permissions><abstract><sec><title>Background and Aims</title><p>Daytime CO<sub>2</sub> efflux rates (<italic>F</italic><sub>CO2</sub>) from tree stems are often reported to be lower than expected from the exponential relationship between temperature and respiration. Explanations of daytime depression in <italic>F</italic><sub>CO2</sub> have focused on the possible role of internal CO<sub>2</sub> transport in the xylem. However, another possible cause that has been overlooked is the daily dynamics of the water status in the living stem tissues and its influence on stem growth rate and thus respiration. The objective of this study was to assess the daily dynamics of stem water status and growth rate and to determine the extent to which they may be linked to daily variations in stem <italic>F</italic><sub>CO2</sub>.</p></sec><sec><title>Methods</title><p><italic>F</italic><sub>CO2</sub> of young beech and oak stems were measured under controlled conditions. Relative stem turgor pressure (<italic>Ψ</italic><sub>p</sub>), obtained from simulations with the ‘RCGro’ model, was used as an indicator of the water status in the living stem tissues. Daily dynamics of stem growth were derived from <italic>Ψ</italic><sub>p</sub>: growth was assumed to occur when <italic>Ψ</italic><sub>p</sub> exceeded a relative threshold value.</p></sec><sec><title>Key Results</title><p>There was a strong correspondence between fluctuations in <italic>F</italic><sub>CO2</sub> and simulated <italic>Ψ</italic><sub>p</sub>. The non-growth conditions during daytime coincided with depressions in <italic>F</italic><sub>CO2</sub>. Moreover, <italic>F</italic><sub>CO2</sub> responded to changes in <italic>Ψ</italic><sub>p</sub> in the absence of growth, indicating also that maintenance processes were influenced by the water status in the living stem tissues.</p></sec><sec><title>Conclusions</title><p>Daytime depressions in stem <italic>F</italic><sub>CO2</sub> correlate with the daily dynamics of turgor, as a measure of the water status in the living stem tissues: it is suggested that water status of tree stems is a potentially important determinant of stem <italic>F</italic><sub>CO2</sub>, as it influences the rate of growth and maintenance processes in the living tissues of the stem.</p></sec></abstract><kwd-group><title>Key words</title><kwd><italic>Fagus sylvatica</italic> (beech)</kwd><kwd><italic>Quercus robur</italic> (oak)</kwd><kwd>CO<sub>2</sub> efflux</kwd><kwd>diameter variations</kwd><kwd>dynamic model</kwd><kwd>radial growth</kwd><kwd>plant–water relations</kwd><kwd>sap flow</kwd><kwd>stem respiration</kwd><kwd>stem turgor pressure</kwd></kwd-group></article-meta></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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