The effect of induced heat waves on Pinus taeda and Quercus rubra seedlings in ambient and elevated CO2 atmospheres.
Identifieur interne : 000271 ( Main/Exploration ); précédent : 000270; suivant : 000272The effect of induced heat waves on Pinus taeda and Quercus rubra seedlings in ambient and elevated CO2 atmospheres.
Auteurs : Maarten Ameye [Belgique] ; Timothy M. Wertin ; Ingvar Bauweraerts ; Mary Anne Mcguire ; Robert O. Teskey ; Kathy SteppeSource :
- The New phytologist [ 1469-8137 ] ; 2012.
English descriptors
- KwdEn :
- Atmosphere (chemistry), Carbon Dioxide (pharmacology), Fluorescence, Hot Temperature, Linear Models, Multivariate Analysis, Photosynthesis (drug effects), Photosystem II Protein Complex (metabolism), Pinus taeda (drug effects), Pinus taeda (physiology), Plant Stomata (drug effects), Plant Stomata (physiology), Plant Transpiration (drug effects), Plant Transpiration (physiology), Quercus (drug effects), Quercus (physiology), Seedlings (drug effects), Seedlings (growth & development), Seedlings (physiology).
- MESH :
- chemical , metabolism : Photosystem II Protein Complex.
- chemical , pharmacology : Carbon Dioxide.
- chemistry : Atmosphere.
- drug effects : Photosynthesis, Pinus taeda, Plant Stomata, Plant Transpiration, Quercus, Seedlings.
- growth & development : Seedlings.
- physiology : Pinus taeda, Plant Stomata, Plant Transpiration, Quercus, Seedlings.
- Fluorescence, Hot Temperature, Linear Models, Multivariate Analysis.
Abstract
Here, we investigated the effect of different heat-wave intensities applied at two atmospheric CO2 concentrations ([CO2]) on seedlings of two tree species, loblolly pine (Pinus taeda) and northern red oak (Quercus rubra). Seedlings were assigned to treatment combinations of two levels of [CO2] (380 or 700 μmol mol(-1)) and four levels of air temperature (ambient, ambient +3°C, or 7-d heat waves consisting of a biweekly +6°C heat wave, or a monthly +12°C heat wave). Treatments were maintained throughout the growing season, thus receiving equal heat sums. We measured gas exchange and fluorescence parameters before, during and after a mid-summer heat wave. The +12°C heat wave, significantly reduced net photosynthesis (Anet) in both species and [CO2] treatments but this effect was diminished in elevated [CO2]. The decrease in Anet was accompanied by a decrease in Fv'/Fm' in P. taeda and ΦPSII in Q. rubra. Our findings suggest that, if soil moisture is adequate, trees will experience negative effects in photosynthetic performance only with the occurrence of extreme heat waves. As elevated [CO2] diminished these negative effects, the future climate may not be as detrimental to plant communities as previously assumed.
DOI: 10.1111/j.1469-8137.2012.04267.x
PubMed: 22897414
Affiliations:
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Wertin</name></author><author><name sortKey="Bauweraerts, Ingvar" sort="Bauweraerts, Ingvar" uniqKey="Bauweraerts I" first="Ingvar" last="Bauweraerts">Ingvar Bauweraerts</name></author><author><name sortKey="Mcguire, Mary Anne" sort="Mcguire, Mary Anne" uniqKey="Mcguire M" first="Mary Anne" last="Mcguire">Mary Anne Mcguire</name></author><author><name sortKey="Teskey, Robert O" sort="Teskey, Robert O" uniqKey="Teskey R" first="Robert O" last="Teskey">Robert O. Teskey</name></author><author><name sortKey="Steppe, Kathy" sort="Steppe, Kathy" uniqKey="Steppe K" first="Kathy" last="Steppe">Kathy Steppe</name></author></analytic><series><title level="j">The New phytologist</title><idno type="eISSN">1469-8137</idno><imprint><date when="2012" type="published">2012</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Atmosphere (chemistry)</term><term>Carbon Dioxide (pharmacology)</term><term>Fluorescence</term><term>Hot Temperature</term><term>Linear Models</term><term>Multivariate Analysis</term><term>Photosynthesis (drug effects)</term><term>Photosystem II Protein Complex (metabolism)</term><term>Pinus taeda (drug effects)</term><term>Pinus taeda (physiology)</term><term>Plant Stomata (drug effects)</term><term>Plant Stomata (physiology)</term><term>Plant Transpiration (drug effects)</term><term>Plant Transpiration (physiology)</term><term>Quercus (drug effects)</term><term>Quercus (physiology)</term><term>Seedlings (drug effects)</term><term>Seedlings (growth & development)</term><term>Seedlings (physiology)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Photosystem II Protein Complex</term></keywords><keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en"><term>Carbon Dioxide</term></keywords><keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Atmosphere</term></keywords><keywords scheme="MESH" qualifier="drug effects" xml:lang="en"><term>Photosynthesis</term><term>Pinus taeda</term><term>Plant Stomata</term><term>Plant Transpiration</term><term>Quercus</term><term>Seedlings</term></keywords><keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Seedlings</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Pinus taeda</term><term>Plant Stomata</term><term>Plant Transpiration</term><term>Quercus</term><term>Seedlings</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Fluorescence</term><term>Hot Temperature</term><term>Linear Models</term><term>Multivariate Analysis</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Here, we investigated the effect of different heat-wave intensities applied at two atmospheric CO2 concentrations ([CO2]) on seedlings of two tree species, loblolly pine (Pinus taeda) and northern red oak (Quercus rubra). Seedlings were assigned to treatment combinations of two levels of [CO2] (380 or 700 μmol mol(-1)) and four levels of air temperature (ambient, ambient +3°C, or 7-d heat waves consisting of a biweekly +6°C heat wave, or a monthly +12°C heat wave). Treatments were maintained throughout the growing season, thus receiving equal heat sums. We measured gas exchange and fluorescence parameters before, during and after a mid-summer heat wave. The +12°C heat wave, significantly reduced net photosynthesis (Anet) in both species and [CO2] treatments but this effect was diminished in elevated [CO2]. The decrease in Anet was accompanied by a decrease in Fv'/Fm' in P. taeda and ΦPSII in Q. rubra. Our findings suggest that, if soil moisture is adequate, trees will experience negative effects in photosynthetic performance only with the occurrence of extreme heat waves. As elevated [CO2] diminished these negative effects, the future climate may not be as detrimental to plant communities as previously assumed.</div></front></TEI><affiliations><list><country><li>Belgique</li></country><region><li>Province de Flandre-Orientale</li><li>Région flamande</li></region><settlement><li>Gand</li></settlement><orgName><li>Université de Gand</li></orgName></list><tree><noCountry><name sortKey="Bauweraerts, Ingvar" sort="Bauweraerts, Ingvar" uniqKey="Bauweraerts I" first="Ingvar" last="Bauweraerts">Ingvar Bauweraerts</name><name sortKey="Mcguire, Mary Anne" sort="Mcguire, Mary Anne" uniqKey="Mcguire M" first="Mary Anne" last="Mcguire">Mary Anne Mcguire</name><name sortKey="Steppe, Kathy" sort="Steppe, Kathy" uniqKey="Steppe K" first="Kathy" last="Steppe">Kathy Steppe</name><name sortKey="Teskey, Robert O" sort="Teskey, Robert O" uniqKey="Teskey R" first="Robert O" last="Teskey">Robert O. Teskey</name><name sortKey="Wertin, Timothy M" sort="Wertin, Timothy M" uniqKey="Wertin T" first="Timothy M" last="Wertin">Timothy M. Wertin</name></noCountry><country name="Belgique"><region name="Région flamande"><name sortKey="Ameye, Maarten" sort="Ameye, Maarten" uniqKey="Ameye M" first="Maarten" last="Ameye">Maarten Ameye</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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