| Titre : | Concentration and 13C of leaf carbohydrates in relation to gas exchange in quercus robur under elevated CO2 and drought | | Type de document : | texte imprimé | | Auteurs : | C. Picon, Auteur ; A. Ferhi, Auteur ; Jean Marc Guehl, Auteur | | Editeur : | Oxford University Press | | Année de publication : | 1997 | | Importance : | pp. 1547-1556 | | Présentation : | graph., tabl., réf. | | Note générale : | Extrait de Journal of Experimental Botany - Vol.48 - n°8 | | Langues : | Anglais (eng) | | Catégories : | Thésaurus Agrovoc
Croissance ; Quercus robur ; Évaporation ; Déficit hydrique du sol ; Échange gazeux ; Dioxyde de carbone
| | Résumé : | The variations of leaf carbohydrate concentration, carbon isotope discrimination of leaf soluble carbohydrate, gas-exchange and growth during a soil drying cycle under 350 and 700 umol mol-1 CO2 concentrations ([CO2]) in Quercus robur seedlings were analysed. In well-watered conditions, a doubling of [CO2] caused an increase of CO2 assimilation rate (A) (+47%) and a decrease of stomatal conductance for water vapour (g) (-25%), and doubled the intrinsic water-use efficiency (A/g). The values of were not affected by elevated [CO2] which was consistent with the 2-fold increase of A/g. Elevated [CO2] also significantly increased sucrose and starch leaf concentrations as well as aerial growth and plant dry weight. The stimulating effect of CO2 enrichment on A and A/g was maintained in moderate drought conditions, but disappeared in the most severe drought conditions. Drought induced an increase of hexose concentrations in both [CO2], but this effect was more pronounced under elevated [CO2], which may contribute o increase osmoregulation. From the onset of drought, starch was depleted in both [CO2]. Carbon isotope discrimination decreased in response to drought, which corresponded to an increase in A/g according to the two-step model of isotopic discrimination. In contrast, the A/g values derived from instantaneous leaf gas-exchange measurements decreased along the drying cycle. The discrepancy observed between the two independent estimates of water-use efficiency is discussed in terms of time-scale integration. The results obtained with the isotopic approach using soluble carbohydrate suggest a predominant stomatal limitation of CO2 assimilation in response to drought. | | Type de document : | Tiré à part | | Permalien de la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=149651 |
Concentration and 13C of leaf carbohydrates in relation to gas exchange in quercus robur under elevated CO2 and drought [texte imprimé] / C. Picon, Auteur ; A. Ferhi, Auteur ; Jean Marc Guehl, Auteur . - [S.l.] : Oxford University Press, 1997 . - pp. 1547-1556 : graph., tabl., réf. Extrait de Journal of Experimental Botany - Vol.48 - n°8 Langues : Anglais ( eng) | Catégories : | Thésaurus Agrovoc
Croissance ; Quercus robur ; Évaporation ; Déficit hydrique du sol ; Échange gazeux ; Dioxyde de carbone
| | Résumé : | The variations of leaf carbohydrate concentration, carbon isotope discrimination of leaf soluble carbohydrate, gas-exchange and growth during a soil drying cycle under 350 and 700 umol mol-1 CO2 concentrations ([CO2]) in Quercus robur seedlings were analysed. In well-watered conditions, a doubling of [CO2] caused an increase of CO2 assimilation rate (A) (+47%) and a decrease of stomatal conductance for water vapour (g) (-25%), and doubled the intrinsic water-use efficiency (A/g). The values of were not affected by elevated [CO2] which was consistent with the 2-fold increase of A/g. Elevated [CO2] also significantly increased sucrose and starch leaf concentrations as well as aerial growth and plant dry weight. The stimulating effect of CO2 enrichment on A and A/g was maintained in moderate drought conditions, but disappeared in the most severe drought conditions. Drought induced an increase of hexose concentrations in both [CO2], but this effect was more pronounced under elevated [CO2], which may contribute o increase osmoregulation. From the onset of drought, starch was depleted in both [CO2]. Carbon isotope discrimination decreased in response to drought, which corresponded to an increase in A/g according to the two-step model of isotopic discrimination. In contrast, the A/g values derived from instantaneous leaf gas-exchange measurements decreased along the drying cycle. The discrepancy observed between the two independent estimates of water-use efficiency is discussed in terms of time-scale integration. The results obtained with the isotopic approach using soluble carbohydrate suggest a predominant stomatal limitation of CO2 assimilation in response to drought. | | Type de document : | Tiré à part | | Permalien de la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=149651 |
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