Optimal stomatal conductance in relation to photosynthesis in climatically contrasting Eucalyptus species under drought
Identifieur interne : 004D64 ( Main/Exploration ); précédent : 004D63; suivant : 004D65Optimal stomatal conductance in relation to photosynthesis in climatically contrasting Eucalyptus species under drought
Auteurs : Arnaud Heroult [Australie, France] ; Yan-Shih Lin [Australie] ; Aimee Bourne [Australie] ; Belinda E. Medlyn [Australie] ; David S. Ellsworth [Australie]Source :
- Plant, cell and environment : (Print) [ 0140-7791 ] ; 2013.
Descripteurs français
- Pascal (Inist)
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- topic : Sécheresse.
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Abstract
Models of stomatal conductance (gs) are based on coupling between gs and CO2 assimilation (Anet), and it is often assumed that the slope of this relationship ('g1') is constant across species. However, if different plant species have adapted to different access costs of water, then there will be differences in g1 among species. We hypothesized that g1 should vary among species adapted to different climates, and tested the theory and its linkage to plant hydraulics using four Eucalyptus species from different climatic origins in a common garden. Optimal stomatal theory predicts that species from sub-humid zones have a lower marginal water cost of C gain, hence lower g1 than humid-zone species. In agreement with the theory that g1 is related to tissue carbon costs for water supply, we found a relationship between wood density and g1 across Eucalyptus species of contrasting climatic origins. There were significant reductions in the parameter g1 during drought in humid but not sub-humid species, with the latter group maintaining g1 in drought. There are strong differences in stomatal behaviour among related tree species in agreement with optimal stomatal theory, and these differences are consistent with the economics involved in water uptake and transport for carbon gain.
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Medlyn</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Biological Sciences, Macquarie University</s1><s2>North Ryde, NSW 2109</s2><s3>AUS</s3><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>North Ryde, NSW 2109</wicri:noRegion></affiliation></author><author><name sortKey="Ellsworth, David S" sort="Ellsworth, David S" uniqKey="Ellsworth D" first="David S." last="Ellsworth">David S. Ellsworth</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Hawkesbury Institute for the Environment, University of Western Sydney</s1><s2>Penrith, NSW 2751</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Penrith, NSW 2751</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Plant, cell and environment : (Print)</title><title level="j" type="abbreviated">Plant cell environ. : (Print)</title><idno type="ISSN">0140-7791</idno><imprint><date when="2013">2013</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Plant, cell and environment : (Print)</title><title level="j" type="abbreviated">Plant cell environ. : (Print)</title><idno type="ISSN">0140-7791</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Climatic condition</term><term>Conductance (fluid)</term><term>Drought</term><term>Eucalyptus</term><term>Gas exchange</term><term>Hydraulic conductivity</term><term>Hydraulic properties</term><term>Modeling</term><term>Photosynthesis</term><term>Plant ecology</term><term>Plant leaf</term><term>Species</term><term>Stomata</term><term>Stomatal conductance</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Conductance stomatique</term><term>Photosynthèse</term><term>Condition climatique</term><term>Espèce</term><term>Sécheresse</term><term>Feuille végétal</term><term>Echange gazeux</term><term>Modélisation</term><term>Propriété hydraulique</term><term>Eucalyptus</term><term>Conductivité hydraulique</term><term>Conductance (fluide)</term><term>Stomate</term><term>Ecologie végétale</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Sécheresse</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Models of stomatal conductance (g<sub>s</sub>) are based on coupling between g<sub>s</sub> and CO<sub>2</sub> assimilation (A<sub>net</sub>), and it is often assumed that the slope of this relationship ('g<sub>1</sub>') is constant across species. However, if different plant species have adapted to different access costs of water, then there will be differences in g<sub>1</sub> among species. We hypothesized that g<sub>1</sub> should vary among species adapted to different climates, and tested the theory and its linkage to plant hydraulics using four Eucalyptus species from different climatic origins in a common garden. Optimal stomatal theory predicts that species from sub-humid zones have a lower marginal water cost of C gain, hence lower g<sub>1</sub> than humid-zone species. In agreement with the theory that g<sub>1</sub> is related to tissue carbon costs for water supply, we found a relationship between wood density and g<sub>1</sub> across Eucalyptus species of contrasting climatic origins. There were significant reductions in the parameter g<sub>1</sub> during drought in humid but not sub-humid species, with the latter group maintaining g<sub>1</sub> in drought. There are strong differences in stomatal behaviour among related tree species in agreement with optimal stomatal theory, and these differences are consistent with the economics involved in water uptake and transport for carbon gain.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country></list><tree><country name="Australie"><noRegion><name sortKey="Heroult, Arnaud" sort="Heroult, Arnaud" uniqKey="Heroult A" first="Arnaud" last="Heroult">Arnaud Heroult</name></noRegion><name sortKey="Bourne, Aimee" sort="Bourne, Aimee" uniqKey="Bourne A" first="Aimee" last="Bourne">Aimee Bourne</name><name sortKey="Ellsworth, David S" sort="Ellsworth, David S" uniqKey="Ellsworth D" first="David S." last="Ellsworth">David S. Ellsworth</name><name sortKey="Lin, Yan Shih" sort="Lin, Yan Shih" uniqKey="Lin Y" first="Yan-Shih" last="Lin">Yan-Shih Lin</name><name sortKey="Lin, Yan Shih" sort="Lin, Yan Shih" uniqKey="Lin Y" first="Yan-Shih" last="Lin">Yan-Shih Lin</name><name sortKey="Medlyn, Belinda E" sort="Medlyn, Belinda E" uniqKey="Medlyn B" first="Belinda E." last="Medlyn">Belinda E. Medlyn</name></country><country name="France"><noRegion><name sortKey="Heroult, Arnaud" sort="Heroult, Arnaud" uniqKey="Heroult A" first="Arnaud" last="Heroult">Arnaud Heroult</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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