A model of plant isoprene emission based on available reducing power captures responses to atmospheric CO₂.
Identifieur interne : 002398 ( Main/Exploration ); précédent : 002397; suivant : 002399A model of plant isoprene emission based on available reducing power captures responses to atmospheric CO₂.
Auteurs : Catherine Morfopoulos [Royaume-Uni] ; Dominik Sperlich ; Josep Pe Uelas ; Iolanda Filella ; Joan Llusià ; Belinda E. Medlyn ; Ülo Niinemets ; Malcolm Possell ; Zhihong Sun ; Iain Colin PrenticeSource :
- The New phytologist [ 1469-8137 ] ; 2014.
Descripteurs français
- KwdFr :
- MESH :
- biosynthèse : Hémiterpènes.
- métabolisme : Carbone, Dioxyde de carbone.
- physiologie : Feuilles de plante, Populus.
- Butadiènes, Modèles biologiques, Pentanes, Photosynthèse.
English descriptors
- KwdEn :
- MESH :
- chemical , biosynthesis : Hemiterpenes.
- chemical , metabolism : Carbon, Carbon Dioxide.
- chemical : Butadienes, Pentanes.
- physiology : Plant Leaves, Populus.
- Models, Biological, Photosynthesis.
Abstract
We present a unifying model for isoprene emission by photosynthesizing leaves based on the hypothesis that isoprene biosynthesis depends on a balance between the supply of photosynthetic reducing power and the demands of carbon fixation. We compared the predictions from our model, as well as from two other widely used models, with measurements of isoprene emission from leaves of Populus nigra and hybrid aspen (Populus tremula × P. tremuloides) in response to changes in leaf internal CO2 concentration (C(i)) and photosynthetic photon flux density (PPFD) under diverse ambient CO2 concentrations (C(a)). Our model reproduces the observed changes in isoprene emissions with C(i) and PPFD, and also reproduces the tendency for the fraction of fixed carbon allocated to isoprene to increase with increasing PPFD. It also provides a simple mechanism for the previously unexplained decrease in the quantum efficiency of isoprene emission with increasing C(a). Experimental and modelled results support our hypothesis. Our model can reproduce the key features of the observations and has the potential to improve process-based modelling of isoprene emissions by land vegetation at the ecosystem and global scales.
DOI: 10.1111/nph.12770
PubMed: 24661143
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<term>Carbon (metabolism)</term>
<term>Carbon Dioxide (metabolism)</term>
<term>Hemiterpenes (biosynthesis)</term>
<term>Models, Biological (MeSH)</term>
<term>Pentanes (MeSH)</term>
<term>Photosynthesis (MeSH)</term>
<term>Plant Leaves (physiology)</term>
<term>Populus (physiology)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>Butadiènes (MeSH)</term>
<term>Carbone (métabolisme)</term>
<term>Dioxyde de carbone (métabolisme)</term>
<term>Feuilles de plante (physiologie)</term>
<term>Hémiterpènes (biosynthèse)</term>
<term>Modèles biologiques (MeSH)</term>
<term>Pentanes (MeSH)</term>
<term>Photosynthèse (MeSH)</term>
<term>Populus (physiologie)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="biosynthesis" xml:lang="en"><term>Hemiterpenes</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Carbon</term>
<term>Carbon Dioxide</term>
</keywords>
<keywords scheme="MESH" type="chemical" xml:lang="en"><term>Butadienes</term>
<term>Pentanes</term>
</keywords>
<keywords scheme="MESH" qualifier="biosynthèse" xml:lang="fr"><term>Hémiterpènes</term>
</keywords>
<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Carbone</term>
<term>Dioxyde de carbone</term>
</keywords>
<keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Feuilles de plante</term>
<term>Populus</term>
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<term>Populus</term>
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<term>Photosynthesis</term>
</keywords>
<keywords scheme="MESH" xml:lang="fr"><term>Butadiènes</term>
<term>Modèles biologiques</term>
<term>Pentanes</term>
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<front><div type="abstract" xml:lang="en">We present a unifying model for isoprene emission by photosynthesizing leaves based on the hypothesis that isoprene biosynthesis depends on a balance between the supply of photosynthetic reducing power and the demands of carbon fixation. We compared the predictions from our model, as well as from two other widely used models, with measurements of isoprene emission from leaves of Populus nigra and hybrid aspen (Populus tremula × P. tremuloides) in response to changes in leaf internal CO2 concentration (C(i)) and photosynthetic photon flux density (PPFD) under diverse ambient CO2 concentrations (C(a)). Our model reproduces the observed changes in isoprene emissions with C(i) and PPFD, and also reproduces the tendency for the fraction of fixed carbon allocated to isoprene to increase with increasing PPFD. It also provides a simple mechanism for the previously unexplained decrease in the quantum efficiency of isoprene emission with increasing C(a). Experimental and modelled results support our hypothesis. Our model can reproduce the key features of the observations and has the potential to improve process-based modelling of isoprene emissions by land vegetation at the ecosystem and global scales.</div>
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<Abstract><AbstractText>We present a unifying model for isoprene emission by photosynthesizing leaves based on the hypothesis that isoprene biosynthesis depends on a balance between the supply of photosynthetic reducing power and the demands of carbon fixation. We compared the predictions from our model, as well as from two other widely used models, with measurements of isoprene emission from leaves of Populus nigra and hybrid aspen (Populus tremula × P. tremuloides) in response to changes in leaf internal CO2 concentration (C(i)) and photosynthetic photon flux density (PPFD) under diverse ambient CO2 concentrations (C(a)). Our model reproduces the observed changes in isoprene emissions with C(i) and PPFD, and also reproduces the tendency for the fraction of fixed carbon allocated to isoprene to increase with increasing PPFD. It also provides a simple mechanism for the previously unexplained decrease in the quantum efficiency of isoprene emission with increasing C(a). Experimental and modelled results support our hypothesis. Our model can reproduce the key features of the observations and has the potential to improve process-based modelling of isoprene emissions by land vegetation at the ecosystem and global scales.</AbstractText>
<CopyrightInformation>© 2014 The Authors. New Phytologist © 2014 New Phytologist Trust.</CopyrightInformation>
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