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Registros recuperados: 8
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Approche a l'echelle du systeme racinaire de l'absorption hydro-minerale. Consequences en matiere de modelisation Inra
Habib, R.; Pages, L.; Jordan, M.O.; Simonneau, T.; Sebillotte, M..
Le but du travail que nous présentons est de discuter de la fonction d’absorption hydro-minérale considérée à l’échelle du système racinaire. L’approche la plus souvent utilisée consiste à attribuer à chaque élément de racine d’un système racinaire la même efficacité vis-à-vis de l’absorption pour estimer ensuite l’absorption totale par l’ensemble du système. Cette hypothèse est souvent considérée comme extrêmement simplificatrice. L’objectif principal de cette revue est de la confronter aux données actuelles de la littérature. Dans un premier temps, nous présentons divers travaux qui permettent de juger du bien fondé de cette approche au niveau du système racinaire. En particulier, nous présentons des données sur la variabilité de l’absorption...
Tipo: Journal Article Palavras-chave: MODELE MACROSCOPIQUE; SYSTEME RACINAIRE; INTERACTION SOL PLANTE; ABSORPTION D'EAU; ABSORPTION MINERALE; CONDUCTIVITE HYDRAULIQUE.
Ano: 1991 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9100010816021295&uri=/notices/prodinra1/2009/06/
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Aquaporin-mediated reduction in Maize root hydraulic conductivity impacts cell turgor and leaf elongation even without changing transpiration Inra
Ehlert, C.; Maurel, C.; Tardieu, F.; Simonneau, T..
Root hydraulic conductivity in plants (Lpr) exhibits large variations in response to abiotic stimuli. In this study, we investigated the impact of dynamic, aquaporin-mediated changes of Lpr on leaf growth, water potential and water flux throughout the plant. For this, we manipulated Lpr by subjecting roots to four independent treatments, with aquaporin inhibitors applied either to transpiring maize (Zea mays L.) plants grown in hydroponics or to de-topped root systems for estimation of Lpr. The treatments were acid load at pH 6.0 and pH 5.0, H2O2 and anoxia applied for one to two hours and subsequently reversed. First, we established that acid load affected cell hydraulic conductivity in maize root cortex. Lpr was reduced by all treatments by 31 to 63 %,...
Tipo: Journal Article Palavras-chave: ABIOTIC STIMULI; LPR ; AQUAPORIN INHIBITOR; MAIZE.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010340f04d2&uri=/notices/prodinra1/2010/08/
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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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Control of leaf growth by abscisic acid: hydraulic or non-hydraulic processes Inra
Tardieu, F.; Parent, B.; Simonneau, T..
Abscisic acid (ABA) affects plant metabolism and water transfers via multiple mechanisms at cell, organ and whole plant levels. These mechanisms translate into contradictory effects on leaf growth, so the literature reports positive, null or negative effects of ABA on leaf growth upon water deficit. We review evidences based on genetic manipulations of ABA biosynthesis, feeding the plant with artificial ABA or partial root drying and provide elements to avoid confusions of effects. We propose that ABA has mainly three effects on growth. (i) Via its controlling effect on stomatal aperture and transpiration rate, an increased concentration of ABA tends to buffer the day-night alternations of leaf growth rate and the negative effect of evaporative demand....
Tipo: Journal Article Palavras-chave: ABA; GROWTH; EXPANSION; TRANSGENICS; NCED; STOMATAL CONDUCTANCE; HYDRAULIC CONDUCTIVITY; AQUAPORINS; WATER.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010bbbd37ad&uri=/notices/prodinra1/2010/08/
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Drought and abscisic acid effects on aquaporin content translate into changes in hydraulic conductivity and leaf growth rate: A trans-scale approach Inra
Parent, B.; Hachez, C.; Redondo, E.; Simonneau, T.; Chaumont, F.; Tardieu, F..
The effects of abscisic acid (ABA) on aquaporin content, root hydraulic conductivity (Lpr), whole plant hydraulic conductance, and leaf growth are controversial. We addressed these effects via a combination of experiments at different scales of plant organization and tested their consistency via a model. We analyzed under moderate water deficit a series of transformed maize (Zea mays) lines, one sense and three antisense, affected in NCED (for 9-cis-epoxycarotenoid dioxygenase) gene expression and that differed in the concentration of ABA in the xylem sap. In roots, the mRNA expression of most aquaporin PIP (for plasma membrane intrinsic protein) genes was increased in sense plants and decreased in antisense plants. The same pattern was observed for the...
Tipo: Journal Article Palavras-chave:  .
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010bafd8852&uri=/notices/prodinra1/2010/05/
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Heteromeric K+ channels in plants Inra
Lebaudy, A.; Hosy, E.; Simonneau, T.; Sentenac, H.; Thibaud, J.B.; Dreyer, I..
Voltage-gated potassium channels of plants are multimeric proteins built of four α-subunits. In the model plant Arabidopsis thaliana, nine genes coding for K+ channel α-subunits have been identified. When co-expressed in heterologous expression systems, most of them display the ability to form heteromeric K+ channels. Till now it was not clear whether plants use this potential of heteromerization to increase the functional diversity of potassium channels. Here, we designed an experimental approach employing different transgenic plant lines that allowed us to prove the existence of heteromeric K+ channels in plants. The chosen strategy might also be useful for investigating the activity and function of other multimeric channel proteins like, for instance,...
Tipo: Journal Article Palavras-chave: CANAL POTASSIQUE; EXPRESSION HETEROLOGUE POTASSIUM CHANNEL; HETEROMERIZATION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008efaacc3a&uri=/notices/prodinra1/2008/09/
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Plant adaptation to fluctuating environment and biomass production are strongly dependent on guard cell potassium channels Inra
Lebaudy, A.; Vavasseur, A.; Hosy, E.; Dreyer, I.; Leonhardt, N.; Thibaud, J.B.; Véry, A.A.; Simonneau, T.; Sentenac, H..
At least four genes encoding plasma membrane inward K+ channels (Kin channels) are expressed in Arabidopsis guard cells. A double mutant plant was engineered by disruption of a major Kin channel gene and expression of a dominant negative channel construct. Using the patch-clamp technique revealed that this mutant was totally deprived of guard cell Kin channel (GCKin) activity, providing a model to investigate the roles of this activity in the plant. GCKin activity was found to be an essential effector of stomatal opening triggered by membrane hyperpolarization andthereby of blue light-induced stomatal opening at dawn. It improved stomatal reactivity to external or internal signals (light, CO2 availability, and evaporative demand). It protected stomatal...
Tipo: Journal Article Palavras-chave: CANAL POTASSIQUE CIRCADIAN RHYTHM; IWARD SHAKER; STOMATA; TRANSCRIPTIONAL WATER LOSS.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200847bab34d&uri=/notices/prodinra1/2008/05/
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The significance of roots as hydraulic rheostats Inra
Maurel, C.; Simonneau, T.; Sutka, M..
Roots are the primary sites of water uptake by plants. Roots also sense most of the physico-chemical parameters of the soil, perceive signals from the shoots, and adjust their growth and water transport properties accordingly. The present opinion paper discusses the significance of the variable water transport capacity (hydraulic conductance) of roots during development and in response to environmental stimuli. It is shown that root hydraulics determines water uptake intensities but also water potential gradients within the plant. It is indicated how the dynamics of root hydraulics contributes to many integrated plant nutritional and growth functions. For instance, the heterogeneity of soil water and nutrient availability and the heterogeneity of root...
Tipo: Journal Article Palavras-chave: AQUAPORIN; DROUGHT; NUTRIENT; ROOT; SOIL WATER; WATER UPTAKE.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201039cf43f6&uri=/notices/prodinra1/2010/08/
Registros recuperados: 8
Primeira ... 1 ... Última
 

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