Photosynthetic responses of cottonwood seedlings grown in glacial through future atmospheric [CO2] vary with phosphorus supply.
Identifieur interne : 003167 ( Main/Exploration ); précédent : 003166; suivant : 003168Photosynthetic responses of cottonwood seedlings grown in glacial through future atmospheric [CO2] vary with phosphorus supply.
Auteurs : David T. Tissue [Australie] ; James D. LewisSource :
- Tree physiology [ 0829-318X ] ; 2010.
Descripteurs français
- KwdFr :
- Adaptation physiologique (MeSH), Changement climatique (MeSH), Cinétique (MeSH), Dioxyde de carbone (métabolisme), Phosphore (métabolisme), Photosynthèse (MeSH), Plant (croissance et développement), Plant (métabolisme), Populus (croissance et développement), Populus (métabolisme), Protéines végétales (métabolisme), Ribulose bisphosphate carboxylase (métabolisme), Stomates de plante (métabolisme), Transport d'électrons (MeSH), Écosystème (MeSH).
- MESH :
- croissance et développement : Plant, Populus.
- métabolisme : Dioxyde de carbone, Phosphore, Plant, Populus, Protéines végétales, Ribulose bisphosphate carboxylase, Stomates de plante.
- Adaptation physiologique, Changement climatique, Cinétique, Photosynthèse, Transport d'électrons, Écosystème.
English descriptors
- KwdEn :
- Adaptation, Physiological (MeSH), Carbon Dioxide (metabolism), Climate Change (MeSH), Ecosystem (MeSH), Electron Transport (MeSH), Kinetics (MeSH), Phosphorus (metabolism), Photosynthesis (MeSH), Plant Proteins (metabolism), Plant Stomata (metabolism), Populus (growth & development), Populus (metabolism), Ribulose-Bisphosphate Carboxylase (metabolism), Seedlings (growth & development), Seedlings (metabolism).
- MESH :
- chemical , metabolism : Carbon Dioxide, Phosphorus, Plant Proteins, Ribulose-Bisphosphate Carboxylase.
- growth & development : Populus, Seedlings.
- metabolism : Plant Stomata, Populus, Seedlings.
- Adaptation, Physiological, Climate Change, Ecosystem, Electron Transport, Kinetics, Photosynthesis.
Abstract
Plants often exhibit proportionately larger photosynthetic responses to the transition from glacial to modern [CO(2)] than from modern to future [CO(2)]. Although this pattern may reflect increased nutrient demand with increasing [CO(2)], few studies have examined the role of nutrient supply in regulating responses to the range of [CO(2)] from glacial to future [CO(2)]. In this study, we examined the effects of P supply (0.004-0.5 mM) on photosynthetic responses of Populus deltoides (cottonwood) seedlings to glacial (200 micromol mol(-1)), modern (350 µmol mol(-1)) and future (700 micromol mol(-1)) [CO(2)]. The A(sat) (light-saturated net photosynthetic rates at the growth [CO(2)]) response to future [CO(2)] decreased with decreasing P supply such that there was no response at the lowest P supply. However, P supply did not affect A(sat) responses to an increase from glacial to modern [CO(2)]. Photosynthetic capacity [e.g., final rubisco activity, apparent, maximal Rubisco-limited rate of photosynthesis (V(cmax)), apparent, maximal electron transport-limited rate of photosynthesis (J(max))], stomatal conductance (g(s)) and leaf P generally increased with increasing P supply but decreased with increasing [CO(2)]. Measures of carbohydrate sink capacity (e.g., leaf mass per unit leaf area, leaf starch) increased with both increasing P supply and increasing [CO(2)]. Changes in V(cmax) and g(s) together accounted for 78% of the variation in A(sat) among [CO(2)] and P treatments, suggesting significant biochemical and stomatal controls on photosynthesis. However, A(sat) responses to increasing [CO(2)] did not reflect the changes in the carbohydrate sink capacity. These results have important implications because low P already constrains responses to increasing [CO(2)] in many ecosystems, and our results suggest that the P demand will increasingly affect A(sat) in cottonwood as [CO(2)] continues to increase.
DOI: 10.1093/treephys/tpq077
PubMed: 20884610
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<term>Ecosystem (MeSH)</term>
<term>Electron Transport (MeSH)</term>
<term>Kinetics (MeSH)</term>
<term>Phosphorus (metabolism)</term>
<term>Photosynthesis (MeSH)</term>
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<term>Dioxyde de carbone (métabolisme)</term>
<term>Phosphore (métabolisme)</term>
<term>Photosynthèse (MeSH)</term>
<term>Plant (croissance et développement)</term>
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<term>Transport d'électrons (MeSH)</term>
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<term>Phosphorus</term>
<term>Plant Proteins</term>
<term>Ribulose-Bisphosphate Carboxylase</term>
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<term>Phosphore</term>
<term>Plant</term>
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<term>Protéines végétales</term>
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<term>Changement climatique</term>
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<term>Transport d'électrons</term>
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<front><div type="abstract" xml:lang="en">Plants often exhibit proportionately larger photosynthetic responses to the transition from glacial to modern [CO(2)] than from modern to future [CO(2)]. Although this pattern may reflect increased nutrient demand with increasing [CO(2)], few studies have examined the role of nutrient supply in regulating responses to the range of [CO(2)] from glacial to future [CO(2)]. In this study, we examined the effects of P supply (0.004-0.5 mM) on photosynthetic responses of Populus deltoides (cottonwood) seedlings to glacial (200 micromol mol(-1)), modern (350 µmol mol(-1)) and future (700 micromol mol(-1)) [CO(2)]. The A(sat) (light-saturated net photosynthetic rates at the growth [CO(2)]) response to future [CO(2)] decreased with decreasing P supply such that there was no response at the lowest P supply. However, P supply did not affect A(sat) responses to an increase from glacial to modern [CO(2)]. Photosynthetic capacity [e.g., final rubisco activity, apparent, maximal Rubisco-limited rate of photosynthesis (V(cmax)), apparent, maximal electron transport-limited rate of photosynthesis (J(max))], stomatal conductance (g(s)) and leaf P generally increased with increasing P supply but decreased with increasing [CO(2)]. Measures of carbohydrate sink capacity (e.g., leaf mass per unit leaf area, leaf starch) increased with both increasing P supply and increasing [CO(2)]. Changes in V(cmax) and g(s) together accounted for 78% of the variation in A(sat) among [CO(2)] and P treatments, suggesting significant biochemical and stomatal controls on photosynthesis. However, A(sat) responses to increasing [CO(2)] did not reflect the changes in the carbohydrate sink capacity. These results have important implications because low P already constrains responses to increasing [CO(2)] in many ecosystems, and our results suggest that the P demand will increasingly affect A(sat) in cottonwood as [CO(2)] continues to increase.</div>
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<Abstract><AbstractText>Plants often exhibit proportionately larger photosynthetic responses to the transition from glacial to modern [CO(2)] than from modern to future [CO(2)]. Although this pattern may reflect increased nutrient demand with increasing [CO(2)], few studies have examined the role of nutrient supply in regulating responses to the range of [CO(2)] from glacial to future [CO(2)]. In this study, we examined the effects of P supply (0.004-0.5 mM) on photosynthetic responses of Populus deltoides (cottonwood) seedlings to glacial (200 micromol mol(-1)), modern (350 µmol mol(-1)) and future (700 micromol mol(-1)) [CO(2)]. The A(sat) (light-saturated net photosynthetic rates at the growth [CO(2)]) response to future [CO(2)] decreased with decreasing P supply such that there was no response at the lowest P supply. However, P supply did not affect A(sat) responses to an increase from glacial to modern [CO(2)]. Photosynthetic capacity [e.g., final rubisco activity, apparent, maximal Rubisco-limited rate of photosynthesis (V(cmax)), apparent, maximal electron transport-limited rate of photosynthesis (J(max))], stomatal conductance (g(s)) and leaf P generally increased with increasing P supply but decreased with increasing [CO(2)]. Measures of carbohydrate sink capacity (e.g., leaf mass per unit leaf area, leaf starch) increased with both increasing P supply and increasing [CO(2)]. Changes in V(cmax) and g(s) together accounted for 78% of the variation in A(sat) among [CO(2)] and P treatments, suggesting significant biochemical and stomatal controls on photosynthesis. However, A(sat) responses to increasing [CO(2)] did not reflect the changes in the carbohydrate sink capacity. These results have important implications because low P already constrains responses to increasing [CO(2)] in many ecosystems, and our results suggest that the P demand will increasingly affect A(sat) in cottonwood as [CO(2)] continues to increase.</AbstractText>
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