Acclimation effects of heat waves and elevated [CO2] on gas exchange and chlorophyll fluorescence of northern red oak (Quercus rubra L.) seedlings
Identifieur interne : 000134 ( Main/Merge ); précédent : 000133; suivant : 000135Acclimation effects of heat waves and elevated [CO2] on gas exchange and chlorophyll fluorescence of northern red oak (Quercus rubra L.) seedlings
Auteurs : Ingvar Bauweraerts [Belgique] ; Maarten Ameye [Belgique] ; Timothy M. Wertin [États-Unis] ; Mary Anne Mcguire [États-Unis] ; Robert O. Teskey [États-Unis] ; Kathy Steppe [Belgique]Source :
- Plant ecology : (Dordrecht) [ 1385-0237 ] ; 2014.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Changement climatique.
English descriptors
- KwdEn :
Abstract
Heat wave frequency and intensity are predicted to increase. We investigated whether repeated exposure to heat waves would induce acclimation in Quercus rubra seedlings and considered [CO2] as an interacting factor. We measured gas exchange and chlorophyll fluorescence of seedlings grown in 380 (CA) or 700 (CE) μmol CO2 mol-1, and three temperature treatments (ambient, ambient +3 °C, and an ambient +12 °C heat wave every fourth week). Measurements were performed during the third and fourth +12 °C heat waves (July and August 2010) at Whitehall Forest, GA, USA. Additionally, previously unexposed seedlings were subjected to the August heat wave to serve as a control to determine acclimation of seedlings which were previously exposed. Seedlings with a history of heat wave exposure showed lower net photosynthesis (Anet) and stomatal conductance (on average -47 and - 38 %, respectively) than seedlings with no such history, when both were subjected to the same +12 °C heat wave. During both heat waves, Anet significantly declined in the +12 °C treatment compared with the other treatments. Additionally, the Anet decline during the August compared with the July heat wave was stronger in CE than in CA, suggesting that elevated [CO2] might have had a negative effect on acclimation capacity. We conclude that seedlings subjected to consecutive heat waves will moderate stomatal conductance outside the heat wave, to reduce water usage at lower temperatures, increasing survival at the expense of carbon assimilation.
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Acclimation effects of heat waves and elevated [CO<sub>2</sub>
] on gas exchange and chlorophyll fluorescence of northern red oak (Quercus rubra L.) seedlings</title>
<author><name sortKey="Bauweraerts, Ingvar" sort="Bauweraerts, Ingvar" uniqKey="Bauweraerts I" first="Ingvar" last="Bauweraerts">Ingvar Bauweraerts</name>
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<placeName><region type="province" nuts="2">Province de Flandre-Orientale</region>
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<orgName type="university">Université de Gand</orgName>
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</author>
<author><name sortKey="Ameye, Maarten" sort="Ameye, Maarten" uniqKey="Ameye M" first="Maarten" last="Ameye">Maarten Ameye</name>
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<author><name sortKey="Wertin, Timothy M" sort="Wertin, Timothy M" uniqKey="Wertin T" first="Timothy M." last="Wertin">Timothy M. Wertin</name>
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<placeName><region type="state">Illinois</region>
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</author>
<author><name sortKey="Mcguire, Mary Anne" sort="Mcguire, Mary Anne" uniqKey="Mcguire M" first="Mary Anne" last="Mcguire">Mary Anne Mcguire</name>
<affiliation wicri:level="2"><inist:fA14 i1="04"><s1>Daniel B. Warnell School of Forestry and Natural Resources, University of Georgia</s1>
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<author><name sortKey="Teskey, Robert O" sort="Teskey, Robert O" uniqKey="Teskey R" first="Robert O." last="Teskey">Robert O. Teskey</name>
<affiliation wicri:level="2"><inist:fA14 i1="04"><s1>Daniel B. Warnell School of Forestry and Natural Resources, University of Georgia</s1>
<s2>Athens, GA 30602</s2>
<s3>USA</s3>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
</inist:fA14>
<country>États-Unis</country>
<placeName><region type="state">Géorgie (États-Unis)</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Steppe, Kathy" sort="Steppe, Kathy" uniqKey="Steppe K" first="Kathy" last="Steppe">Kathy Steppe</name>
<affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Laboratory of Plant Ecology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653</s1>
<s2>9000 Ghent</s2>
<s3>BEL</s3>
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<series><title level="j" type="main">Plant ecology : (Dordrecht)</title>
<title level="j" type="abbreviated">Plant ecol. : (Dordr.)</title>
<idno type="ISSN">1385-0237</idno>
<imprint><date when="2014">2014</date>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adaptation</term>
<term>Carbon dioxide</term>
<term>Chlorophyll</term>
<term>Climate change</term>
<term>Fluorescence</term>
<term>Gas exchange</term>
<term>Heat</term>
<term>Increase</term>
<term>Photosynthesis</term>
<term>Plant ecology</term>
<term>Plant juvenile growth stage</term>
<term>Quercus rubra</term>
<term>Stomatal conductance</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Adaptation</term>
<term>Chaleur</term>
<term>Augmentation</term>
<term>Echange gazeux</term>
<term>Fluorescence</term>
<term>Stade juvénile plante</term>
<term>Changement climatique</term>
<term>Photosynthèse</term>
<term>Conductance stomatique</term>
<term>Quercus rubra</term>
<term>Dioxyde de carbone</term>
<term>Chlorophylle</term>
<term>Ecologie végétale</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Changement climatique</term>
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<front><div type="abstract" xml:lang="en">Heat wave frequency and intensity are predicted to increase. We investigated whether repeated exposure to heat waves would induce acclimation in Quercus rubra seedlings and considered [CO<sub>2</sub>
] as an interacting factor. We measured gas exchange and chlorophyll fluorescence of seedlings grown in 380 (C<sub>A</sub>
) or 700 (C<sub>E</sub>
) μmol CO<sub>2</sub>
mol<sup>-1</sup>
, and three temperature treatments (ambient, ambient +3 °C, and an ambient +12 °C heat wave every fourth week). Measurements were performed during the third and fourth +12 °C heat waves (July and August 2010) at Whitehall Forest, GA, USA. Additionally, previously unexposed seedlings were subjected to the August heat wave to serve as a control to determine acclimation of seedlings which were previously exposed. Seedlings with a history of heat wave exposure showed lower net photosynthesis (A<sub>net</sub>
) and stomatal conductance (on average -47 and - 38 %, respectively) than seedlings with no such history, when both were subjected to the same +12 °C heat wave. During both heat waves, A<sub>net</sub>
significantly declined in the +12 °C treatment compared with the other treatments. Additionally, the A<sub>net</sub>
decline during the August compared with the July heat wave was stronger in C<sub>E</sub>
than in C<sub>A</sub>
, suggesting that elevated [CO<sub>2</sub>
] might have had a negative effect on acclimation capacity. We conclude that seedlings subjected to consecutive heat waves will moderate stomatal conductance outside the heat wave, to reduce water usage at lower temperatures, increasing survival at the expense of carbon assimilation.</div>
</front>
</TEI>
<affiliations><list><country><li>Belgique</li>
<li>États-Unis</li>
</country>
<region><li>Géorgie (États-Unis)</li>
<li>Illinois</li>
<li>Province de Flandre-Orientale</li>
</region>
<settlement><li>Gand</li>
</settlement>
<orgName><li>Université de Gand</li>
</orgName>
</list>
<tree><country name="Belgique"><region name="Province de Flandre-Orientale"><name sortKey="Bauweraerts, Ingvar" sort="Bauweraerts, Ingvar" uniqKey="Bauweraerts I" first="Ingvar" last="Bauweraerts">Ingvar Bauweraerts</name>
</region>
<name sortKey="Ameye, Maarten" sort="Ameye, Maarten" uniqKey="Ameye M" first="Maarten" last="Ameye">Maarten Ameye</name>
<name sortKey="Ameye, Maarten" sort="Ameye, Maarten" uniqKey="Ameye M" first="Maarten" last="Ameye">Maarten Ameye</name>
<name sortKey="Steppe, Kathy" sort="Steppe, Kathy" uniqKey="Steppe K" first="Kathy" last="Steppe">Kathy Steppe</name>
</country>
<country name="États-Unis"><region name="Illinois"><name sortKey="Wertin, Timothy M" sort="Wertin, Timothy M" uniqKey="Wertin T" first="Timothy M." last="Wertin">Timothy M. Wertin</name>
</region>
<name sortKey="Mcguire, Mary Anne" sort="Mcguire, Mary Anne" uniqKey="Mcguire M" first="Mary Anne" last="Mcguire">Mary Anne Mcguire</name>
<name sortKey="Teskey, Robert O" sort="Teskey, Robert O" uniqKey="Teskey R" first="Robert O." last="Teskey">Robert O. Teskey</name>
</country>
</tree>
</affiliations>
</record>
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