Determination of the site of CO₂ sensing in poplar: is the area-based N content and anatomy of new leaves determined by their immediate CO₂ environment or by the CO₂ environment of mature leaves?
Identifieur interne : 002F38 ( Main/Curation ); précédent : 002F37; suivant : 002F39Determination of the site of CO₂ sensing in poplar: is the area-based N content and anatomy of new leaves determined by their immediate CO₂ environment or by the CO₂ environment of mature leaves?
Auteurs : Shin-Ichi Miyazawa [Canada] ; Charles R. Warren ; David H. Turpin ; Nigel J. LivingstonSource :
- Journal of experimental botany [ 1460-2431 ] ; 2011.
Descripteurs français
- KwdFr :
- Analyse de variance (MeSH), Azote (métabolisme), Cellules du mésophylle (cytologie), Cellules du mésophylle (effets des médicaments et des substances chimiques), Cellules du mésophylle (métabolisme), Dioxyde de carbone (pharmacologie), Environnement (MeSH), Feuilles de plante (anatomie et histologie), Feuilles de plante (croissance et développement), Feuilles de plante (cytologie), Feuilles de plante (effets des médicaments et des substances chimiques), Populus (anatomie et histologie), Populus (cytologie), Populus (effets des médicaments et des substances chimiques), Populus (métabolisme).
- MESH :
- anatomie et histologie : Feuilles de plante, Populus.
- croissance et développement : Feuilles de plante.
- cytologie : Cellules du mésophylle, Feuilles de plante, Populus.
- effets des médicaments et des substances chimiques : Cellules du mésophylle, Feuilles de plante, Populus.
- métabolisme : Azote, Cellules du mésophylle, Populus.
- pharmacologie : Dioxyde de carbone.
- Analyse de variance, Environnement.
English descriptors
- KwdEn :
- Analysis of Variance (MeSH), Carbon Dioxide (pharmacology), Environment (MeSH), Mesophyll Cells (cytology), Mesophyll Cells (drug effects), Mesophyll Cells (metabolism), Nitrogen (metabolism), Plant Leaves (anatomy & histology), Plant Leaves (cytology), Plant Leaves (drug effects), Plant Leaves (growth & development), Populus (anatomy & histology), Populus (cytology), Populus (drug effects), Populus (metabolism).
- MESH :
- chemical , metabolism : Nitrogen.
- chemical , pharmacology : Carbon Dioxide.
- anatomy & histology : Plant Leaves, Populus.
- cytology : Mesophyll Cells, Plant Leaves, Populus.
- drug effects : Mesophyll Cells, Plant Leaves, Populus.
- growth & development : Plant Leaves.
- metabolism : Mesophyll Cells, Populus.
- Analysis of Variance, Environment.
Abstract
Exposure to an elevated CO(2) concentration ([CO(2)]) generally decreases leaf N content per unit area (N(area)) and stomatal density, and increases leaf thickness. Mature leaves can 'sense' elevated [CO(2)] and this regulates stomatal development of expanding leaves (systemic regulation). It is unclear if systemic regulation is involved in determination of leaf thickness and N(area)-traits that are significantly correlated with photosynthetic capacity. A cuvette system was used whereby [CO(2)] around mature leaves was controlled separately from that around expanding leaves. Expanding leaves of poplar (Populus trichocarpa×P. deltoides) seedlings were exposed to elevated [CO(2)] (720 μmol mol(-1)) while the remaining mature leaves inside the cuvette were under ambient [CO(2)] of 360 μmol mol(-1). Reverse treatments were performed. Exposure of newly developing leaves to elevated [CO(2)] increased their thickness, but when mature leaves were exposed to elevated [CO(2)] the increase in thickness of new leaves was less pronounced. The largest response to [CO(2)] was reflected in the palisade tissue thickness (as opposed to the spongy tissue) of new leaves. The N(area) of new leaves was unaffected by the local [CO(2)] where the new leaves developed, but decreased following the exposure of mature leaves to elevated [CO(2)]. The volume fraction of mesophyll cells compared with total leaf and the mesophyll cell density changed in a manner similar to the response of N(area). These results suggest that N(area) is controlled independently of the leaf thickness, and suggest that N(area) is under systemic regulation by [CO(2)] signals from mature leaves that control mesophyll cell division.
DOI: 10.1093/jxb/erq454
PubMed: 21273339
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pubmed:21273339Le document en format XML
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<front><div type="abstract" xml:lang="en">Exposure to an elevated CO(2) concentration ([CO(2)]) generally decreases leaf N content per unit area (N(area)) and stomatal density, and increases leaf thickness. Mature leaves can 'sense' elevated [CO(2)] and this regulates stomatal development of expanding leaves (systemic regulation). It is unclear if systemic regulation is involved in determination of leaf thickness and N(area)-traits that are significantly correlated with photosynthetic capacity. A cuvette system was used whereby [CO(2)] around mature leaves was controlled separately from that around expanding leaves. Expanding leaves of poplar (Populus trichocarpa×P. deltoides) seedlings were exposed to elevated [CO(2)] (720 μmol mol(-1)) while the remaining mature leaves inside the cuvette were under ambient [CO(2)] of 360 μmol mol(-1). Reverse treatments were performed. Exposure of newly developing leaves to elevated [CO(2)] increased their thickness, but when mature leaves were exposed to elevated [CO(2)] the increase in thickness of new leaves was less pronounced. The largest response to [CO(2)] was reflected in the palisade tissue thickness (as opposed to the spongy tissue) of new leaves. The N(area) of new leaves was unaffected by the local [CO(2)] where the new leaves developed, but decreased following the exposure of mature leaves to elevated [CO(2)]. The volume fraction of mesophyll cells compared with total leaf and the mesophyll cell density changed in a manner similar to the response of N(area). These results suggest that N(area) is controlled independently of the leaf thickness, and suggest that N(area) is under systemic regulation by [CO(2)] signals from mature leaves that control mesophyll cell division.</div>
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<Abstract><AbstractText>Exposure to an elevated CO(2) concentration ([CO(2)]) generally decreases leaf N content per unit area (N(area)) and stomatal density, and increases leaf thickness. Mature leaves can 'sense' elevated [CO(2)] and this regulates stomatal development of expanding leaves (systemic regulation). It is unclear if systemic regulation is involved in determination of leaf thickness and N(area)-traits that are significantly correlated with photosynthetic capacity. A cuvette system was used whereby [CO(2)] around mature leaves was controlled separately from that around expanding leaves. Expanding leaves of poplar (Populus trichocarpa×P. deltoides) seedlings were exposed to elevated [CO(2)] (720 μmol mol(-1)) while the remaining mature leaves inside the cuvette were under ambient [CO(2)] of 360 μmol mol(-1). Reverse treatments were performed. Exposure of newly developing leaves to elevated [CO(2)] increased their thickness, but when mature leaves were exposed to elevated [CO(2)] the increase in thickness of new leaves was less pronounced. The largest response to [CO(2)] was reflected in the palisade tissue thickness (as opposed to the spongy tissue) of new leaves. The N(area) of new leaves was unaffected by the local [CO(2)] where the new leaves developed, but decreased following the exposure of mature leaves to elevated [CO(2)]. The volume fraction of mesophyll cells compared with total leaf and the mesophyll cell density changed in a manner similar to the response of N(area). These results suggest that N(area) is controlled independently of the leaf thickness, and suggest that N(area) is under systemic regulation by [CO(2)] signals from mature leaves that control mesophyll cell division.</AbstractText>
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