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Registros recuperados: 4
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Arabidopsis plants acclimate to water deficit at low cost through changes of carbon usage: an integrated perspective using growth, metabolite, enzyme, and gene expression analysis Inra
Hummel, I.; Pantin, F.; Sulpice, R.; Piques, M.; Rolland, G.; Dauzat, M.; Christophe, A.; Pervent, M.; Bouteillé, M.; Stitt, M.; Gibon, Y.; Muller, B..
Growth and carbon (C) fluxes are severely altered in plants exposed to soil water deficit. Correspondingly, it has been suggested that plants under water deficit suffer from C shortage. In this study, we test this hypothesis in Arabidopsis (Arabidopsis thaliana) by providing an overview of the responses of growth, C balance, metabolites, enzymes of the central metabolism, and a set of sugar-responsive genes to a sustained soil water deficit. The results show that under drought, rosette relative expansion rate is decreased more than photosynthesis, leading to a more positive C balance, while root growth is promoted. Several soluble metabolites accumulate in response to soil water deficit, with K+ and organic acids as the main contributors to osmotic...
Tipo: Journal Article Palavras-chave:  .
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010b164e296&uri=/notices/prodinra1/2010/12/
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Association of specific expansins with longitudinal and lateral expansion in maize leaves is maintained under environmental, genetic and developmental sources of variation Inra
Muller, B.; Bourdais, G.; Reidy, B.; Bencivenni, C.; Massonneau, A.; Condamine, P.; Rolland, G.; Conejero, G.; Rogowsky, P.; Tardieu, F..
We aimed to evaluate whether changes in maize (Zea mays) leaf expansion rate in response to environmental stimuli or developmental gradients are mediated by common or specific expansins, a class of proteins known to enhance cell wall extensibility. Among the 33 maize expansin or putative expansin genes analyzed, 19 were preferentially expressed at some point of the leaf elongation zone and these expansins could be organized into three clusters related to cell division, maximal leaf expansion, and cell wall differentiation. Further analysis of the spatial distribution of expression was carried out for three expansins in leaves displaying a large range of expansion rates due to water deficit, genotype, and leaf developmental stage. With most sources of...
Tipo: Journal Article Palavras-chave: CROISSANCE FOLIAIRE; EXPANSINE.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20088e3add59&uri=/notices/prodinra1/2008/10/
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Control of leaf expansion: a developmental switch from metabolics to hydraulics Inra
Pantin, F.; Simonneau, T.; Rolland, G.; Dauzat, M.; Muller, B..
Leaf expansion is the central process by which plants colonize space, allowing energy capture and carbon acquisition. Water and carbon emerge as main limiting factors of leaf expansion, but the literature remains controversial about their respective contributions. Here, we tested the hypothesis that the importance of hydraulics and metabolics is organized according to both dark/light fluctuations and leaf ontogeny. For this purpose, we established the developmental pattern of individual leaf expansion during days and nights in the model plant Arabidopsis (Arabidopsis thaliana). Under control conditions, decreases in leaf expansion were observed at night immediately after emergence, when starch reserves were lowest. These nocturnal decreases were strongly...
Tipo: Journal Article Palavras-chave: TURGESCENCE; LUMIERE.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011995a4e3b&uri=/notices/prodinra1/2011/06/
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Stockage de carbone dans la biomasse aérienne en forêt tropicale humide guyanaise Inra
Rolland, G..
Les forêts tropicales humides sont actuellement considérées comme des puits de carbone. Notre étude porte sur la forêt tropicale humide non perturbée du dispositif « Guyaflux » en Guyane Française. Les résultats de production nette de l’écosystème obtenus grâce à la méthode des corrélations turbulentes suggèrent que la forêt a stocké 1,14 Tc/ha/an entre 2004 et 2006. Nous avons cherché à mettre en évidence si une partie de ce carbone pouvait être accumulé dans la biomasse aérienne. Des mesures de circonfé- rence des arbres (> 10 cm de diamètre)sur dix carrés (10x0,49ha) dans la zone de mesure de la tour ont permis d'estimer la biomasse aérienne à l'aide d'une relation allométrique en 2004 et 2006. Les résultats indiquent qu'au cours de cette période, la...
Tipo: Thesis Palavras-chave: FORET TROPICALE HUMIDE; VARIABILITE SPATIALE; SYLVIGENESE; GUYALUX CARBONE BALANCE; ABOVEGROUND BIOMASS; SYLVIGENETIC PROCESSES.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007bcf600bf&uri=/notices/prodinra1/2008/10/
Registros recuperados: 4
Primeira ... 1 ... Última
 

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