Whole-tree level water balance and its implications on stomatal oscillations in orange trees [Citrus sinensis (L.) Osbeck] under natural climatic conditions
Identifieur interne : 002508 ( Main/Merge ); précédent : 002507; suivant : 002509Whole-tree level water balance and its implications on stomatal oscillations in orange trees [Citrus sinensis (L.) Osbeck] under natural climatic conditions
Auteurs : S. Dzikiti [Zimbabwe] ; K. Steppe [Belgique] ; R. Lemeur [Belgique] ; J. R. Milford [Zimbabwe]Source :
- Journal of experimental botany [ 0022-0957 ] ; 2007.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Sustained cyclic oscillations in stomatal conductance, leaf water potential, and sap flow were observed in young orange trees growing under natural conditions. The oscillations had an average period of approximately 70 min. Water uptake by the roots and loss by the leaves was characterized by large time lags which led to imbalances between water supply and demand in the leaves. The bulk of the lag in response between stomatal movements and the upstream water balance resided downstream of the branch, with branch level sap flow lagging behind the stomatal conductance by approximately 20 min while the stem sap flow had a much shorter time lag of only 5 min behind the branch sap flow. This imbalance between water uptake and loss caused transient changes in internal water deficits which were closely correlated to the dynamics of the leaf water potential. The hydraulic resistance of the whole tree fluctuated throughout the day, suggesting transient changes in the efficiency of water supply to the leaves. A simple whole-tree water balance model was applied to describe the dynamics of water transport in the young orange trees, and typical values of the hydraulic parameters of the transpiration stream were estimated. In addition to the hydro-passive stomatal movements, whole-tree water balance appears to be an important factor in the generation of stomatal oscillations.
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Osbeck] under natural climatic conditions</title><author><name sortKey="Dzikiti, S" sort="Dzikiti, S" uniqKey="Dzikiti S" first="S." last="Dzikiti">S. Dzikiti</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Agricultural Meteorology Group, Department of Physics, University of Zimbabwe, PO Box MP 167</s1><s2>Mt Pleasant, Harare</s2><s3>ZWE</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Zimbabwe</country><wicri:noRegion>Mt Pleasant, Harare</wicri:noRegion></affiliation></author><author><name sortKey="Steppe, K" sort="Steppe, K" uniqKey="Steppe K" first="K." last="Steppe">K. Steppe</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Faculty of Bioscience Engineering, Laboratory of Plant Ecology, Ghent University, Coupure links 653</s1><s2>9000 Ghent</s2><s3>BEL</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Belgique</country><placeName><region type="province" nuts="2">Province de Flandre-Orientale</region><settlement type="city">Gand</settlement></placeName></affiliation></author><author><name sortKey="Lemeur, R" sort="Lemeur, R" uniqKey="Lemeur R" first="R." last="Lemeur">R. Lemeur</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Faculty of Bioscience Engineering, Laboratory of Plant Ecology, Ghent University, Coupure links 653</s1><s2>9000 Ghent</s2><s3>BEL</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Belgique</country><placeName><region type="province" nuts="2">Province de Flandre-Orientale</region><settlement type="city">Gand</settlement></placeName></affiliation></author><author><name sortKey="Milford, J R" sort="Milford, J R" uniqKey="Milford J" first="J. R." last="Milford">J. R. Milford</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Agricultural Meteorology Group, Department of Physics, University of Zimbabwe, PO Box MP 167</s1><s2>Mt Pleasant, Harare</s2><s3>ZWE</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Zimbabwe</country><wicri:noRegion>Mt Pleasant, Harare</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Journal of experimental botany</title><title level="j" type="abbreviated">J. exp. bot.</title><idno type="ISSN">0022-0957</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of experimental botany</title><title level="j" type="abbreviated">J. exp. bot.</title><idno type="ISSN">0022-0957</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Citrus sinensis</term><term>Stem</term><term>Stomata</term><term>Water balance</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Bilan eau</term><term>Stomate</term><term>Tige</term><term>Citrus sinensis</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Sustained cyclic oscillations in stomatal conductance, leaf water potential, and sap flow were observed in young orange trees growing under natural conditions. The oscillations had an average period of approximately 70 min. Water uptake by the roots and loss by the leaves was characterized by large time lags which led to imbalances between water supply and demand in the leaves. The bulk of the lag in response between stomatal movements and the upstream water balance resided downstream of the branch, with branch level sap flow lagging behind the stomatal conductance by approximately 20 min while the stem sap flow had a much shorter time lag of only 5 min behind the branch sap flow. This imbalance between water uptake and loss caused transient changes in internal water deficits which were closely correlated to the dynamics of the leaf water potential. The hydraulic resistance of the whole tree fluctuated throughout the day, suggesting transient changes in the efficiency of water supply to the leaves. A simple whole-tree water balance model was applied to describe the dynamics of water transport in the young orange trees, and typical values of the hydraulic parameters of the transpiration stream were estimated. In addition to the hydro-passive stomatal movements, whole-tree water balance appears to be an important factor in the generation of stomatal oscillations.</div></front></TEI><affiliations><list><country><li>Belgique</li><li>Zimbabwe</li></country><region><li>Province de Flandre-Orientale</li></region><settlement><li>Gand</li></settlement></list><tree><country name="Zimbabwe"><noRegion><name sortKey="Dzikiti, S" sort="Dzikiti, S" uniqKey="Dzikiti S" first="S." last="Dzikiti">S. Dzikiti</name></noRegion><name sortKey="Milford, J R" sort="Milford, J R" uniqKey="Milford J" first="J. R." last="Milford">J. R. Milford</name></country><country name="Belgique"><region name="Province de Flandre-Orientale"><name sortKey="Steppe, K" sort="Steppe, K" uniqKey="Steppe K" first="K." last="Steppe">K. Steppe</name></region><name sortKey="Lemeur, R" sort="Lemeur, R" uniqKey="Lemeur R" first="R." last="Lemeur">R. Lemeur</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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