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Registros recuperados: 23
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A modelling approach to genotype × environment interaction: genetic analysis of the response of maize growth to environmental conditions Frontis
Sadok, W.; Boussuge, B.; Welcker, C.; Tardieu, F..
Expansive growth of organs has a very large genotype × environment (G×E) interaction. Maximum leaf expansion rate observed in the absence of stress and of evaporative demand has a genetic variability which is usually smaller than environmental effects. The mechanisms driving the reduction in leaf growth rate under stress, namely changes in cell division rate, in cell-wall mechanical properties and in turgor, and their signalling pathways, interact in such a way that a bottom-up approach from genes to the G×E interaction cannot be envisaged. We propose an approach combining modelling and genetic dissection of model parameters. Three genotype-dependent parameters are considered for analysing the G×E interaction for leaf elongation rate of maize. The maximum...
Tipo: Conference proceedings
Ano: 2007 URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1297
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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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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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Caracterisation en tant que capteur d'eau de l'enracinement du mais en parcelle cultivee. I. - Discussion des criteres d'etude Inra
Tardieu, F.; Manichon, H..
Les méthodes de caractérisation du système racinaire en tant que capteur d’eau sont discutées, spécifiquement dans le cas où il existe une forte variabilité horizontale de la densité racinaire liée à la présence d’obstacles structuraux à la pénétration des racines. L’examen des expérimentations et des modèles portant sur le transfert d’eau entre le sol et les racines suggère que, dans ce cas, les conclusions de NEWMAN (1969) ne sont pas valides et que les résistances au transfert de l’eau à l’intérieur du sol peuvent être importantes. La distance entre chaque point du sol et la racine la plus proche reste alors un critère pertinent pour caractériser la résistance au transfert de l’eau entre le sol et les plantes. Des calculs effectués sur des...
Tipo: Journal Article Palavras-chave: ENRACINEMENT; TRANSFERT D'EAU; REPARTITION SPATIALE; DISTANCE RACINAIRE.
Ano: 1986 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9000001850015177&uri=/notices/prodinra1/2009/03/
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Caracterisation en tant que capteur d'eau de l'enracinement du mais en parcelle cultivee. II. - Une methode d'etude de la repartition verticale et horizontale des racines Inra
Tardieu, F.; Manichon, H..
Une méthode de caractérisation des systèmes racinaires est proposée, qui permet de prendre en compte la variabilité horizontale de la densité racinaire. Elle consiste à cartographier les impacts de racines sur un plan vertical et 5 plans horizontaux superposés coupant le volume enraciné. Cette méthode permet, d’une part, d’analyser finement les sources de variation (décimétriques) de la densité racinaire (distance au rang de semis, état structural par exemple) et, d’autre part, de calculer directement, à partir des cartes horizontales, la fonction de répartition des distances entre chaque point du sol et la racine la plus proche (elle remplace ainsi le calcul indirect de la « distance moyenne entre racines voisines » à partir de la longueur de...
Tipo: Journal Article Palavras-chave: REPARTITION SPATIALE; ENRACINEMENT; DENSITE RACINAIRE.
Ano: 1986 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9000001849015176&uri=/notices/prodinra1/2009/03/
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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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Co-ordination of cell division and tissue expansion in sunflower, tobacco, and pea leaves: dependence or independence of both processes ? Inra
Granier, C.; Turc, O.; Tardieu, F..
Temporal analyses of cell division and tissue expansion in pea, tobacco, and sunflower leaves reveal that both processes follow similar patterns during leaf development. Relative cell division and relative tissue expansion rates are maximal and constant during early leaf development, but they decline later. In contrast, relative cell expansion rate follows a bell-shaped curve during leaf growth. Cell division and tissue expansion have common responses to temperature, intercepted radiation, and water deficit. As a consequence, final leaf area and cell number remain highly correlated throughout a large range of environmental conditions for these different plant species, indicating that cell division and tissue expansion are co-ordinated during leaf...
Tipo: Journal Article Palavras-chave: CROISSANCE; DEVELOPPEMENT DES FEUILLES; EXPANSION DES TISSUS; ANALYSE CINEMATIQUE LEAF DEVELOPMENT; CELL DIVISION; TISSUE EXPANSION; DICOTYLEDONOUS; KINEMATIC ANALYSES.
Ano: 2000 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0200006642092864&uri=/notices/prodinra1/2010/12/
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Diel time-courses of leaf growth in monocot and dicot species: endogenous rhythms and temperature effects Inra
Poiré, R.; Wiese-Klinkenberg, A.; Parent, B.; Mielewczik, M.; Schurr, U.; Tardieu, F.; Walter, A..
Diel (24 h) leaf growth patterns were differently affected by temperature variations and the circadian clock in several plant species. In the monocotyledon Zea mays, leaf elongation rate closely followed changes in temperature. In the dicotyledons Nicotiana tabacum, Ricinus communis, and Flaveria bidentis, the effect of temperature regimes was less obvious and leaf growth exhibited a clear circadian oscillation.These differences were related neither to primary metabolism nor to altered carbohydrate availability for growth. The effect of endogenous rhythms on leaf growth was analysed under continuous light in Arabidopsis thaliana, Ricinus communis, Zea mays, and Oryza sativa. No rythmic growth was observed under continuous light in the two monocotyledons,...
Tipo: Journal Article Palavras-chave: CIRCADIAN CLOCK; ELONGATION; EXPANSION; IMAGE ANALYSIS; PHOTOSYNTHESIS; STARCH; SUCROSE.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010bb27130c&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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Drought-induced changes in anthesis-silking interval are related to silk expansion: a spatio-temporal growth analysis in maize plants subjected to soil water deficit Inra
Fuad hassan, A.; Tardieu, F.; Turc, O..
The growth and emergence of maize silks has a considerable importance in yield determination under drought conditions. Spatial and temporal patterns of the rates of tissue expansion and of cell division were characterized in silks of plants subjected to different soil water potentials. In all cases, silk development consisted of four phases: (1) cell division and tissue expansion occurred together uniformly all along the silk; (2) cell division progressively ceased from tip to base, while expansion remained spatially uniform including during the phase (3) after the cessation of cell division; and (4) as the silk emerged from the husks, expansion ceased in the emerged portion, probably because of direct evaporative demand, while the relative growth rate...
Tipo: Journal Article Palavras-chave: SOIE CELL DIVISION; SOIL WATER POTENTIAL; STIGMA; TISSUE EXPANSION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008e6813e2&uri=/notices/prodinra1/2008/09/
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Etat structural, enracinement et alimentation hydrique du mais. I. Modelisation d'etats structuraux types de la couche labouree [variabilite spatiale, tassement du sol, cartes de l'etat structural Inra
Tardieu, F.; Manichon, H..
Trois états structuraux types de la couche labourée, qui simulent des situations fréquemment observées en parcelles cultivées, ont été reproduits à 4 reprises sur des dispositifs expérimentaux en sols limoneux à l’aide de techniques appropriées. Ils ont été caractérisés chaque année par des cartes structurales répétées et par des mesures de masse volumique et d’humidité du sol. Le premier, « 0 », est formé de terre fine et de mottes centimétriques ; il représente des parcelles peu dégradées dans leur histoire récente. Le deuxième, « B », est une juxtaposition de blocs tassés et de cavités structurales, et représente les situations où de forts tassements ont eu lieu avant le labour. Le troisième, « C », est continu et compact sur 30 cm au semis, mais...
Tipo: Journal Article Palavras-chave: COUCHE ARABLE; COMPACTAGE DU SOL.
Ano: 1987 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=RES8700534021283&uri=/notices/prodinra1/2009/06/
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Etat structural, enracinement et alimentation hydrique du maïs. II. - Croissance et disposition¨ spatiale du système racinaire Inra
Tardieu, F.; Manichon, H..
Quatre essais ont été conduits au champ pour étudier l’effet de l’état structural de la couche labourée sur l’enracinement. Dans chacun de ceux-ci les traitements expérimentaux sont les 3 états 0, B et C de la couche labourée présentés dans le le! article de cette série. La cinétique d’approfondissement du front racinaire a été affectée par les traitements, mais la profondeur maximale d’enracinement, atteinte après floraison, ne l’a pas été. La croissance de la masse racinaire a été différente entre traitements ; les rapports Masse racinaire/Masse aérienne + racinaire, calculés à la floraison sont cependant similaires dans toutes les situations. La croissance de l’ensemble des plantes, racines et parties aériennes, a donc été plus rapide dans le...
Tipo: Journal Article Palavras-chave: SYSTEME RACINAIRE; COMPACTAGE DU SOL; ABSORPTION D'EAU; CROISSANCE; EAU DISPONIBLE; RELATION PLANTE EAU; RELATION PLANTE SOL.
Ano: 1987 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=RES8700533021276&uri=/notices/prodinra1/2009/06/
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Etat structural, enracinement et alimentation hydrique du maïs. III. Disponibilite des reserves en eau du sol Inra
Tardieu, F..
Les variations de stock d’eau du sol, et la conductance stomatique des feuilles supérieures de couverts du maïs¨ ont été mesurés trois années pendant les 6 semaines qui encadrent la floraison. Les mesures ont été effectuées dans des parcelles d’états structuraux contrastés appartenant à un champ expérimental où l’état des parties aériennes et souterraines était par ailleurs suivi. Dans les parcelles où la couche labourée est de structure continue et compacte, les prélèvements d’eau ont été près de 2 fois plus faibles que dans les autres parcelles ; ceci a eu pour conséquence l’apparition (après quelques jours sans pluie) de différences entre traitements de la conductance stomatique, bien que la teneur en eau du sol soit restée en permanence plus...
Tipo: Journal Article Palavras-chave: RESISTANCE STOMATIQUE; TASSEMENT DU SOL; TRANSFERT D'EAU; ENRACINEMENT; STOMATE.
Ano: 1987 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9000001848015175&uri=/notices/prodinra1/2009/06/
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Floret initiation, tissue expansion and carbon availability at the meristem of the sunflower capitulum as affected by water or light deficits Inra
Dosio, G.A.A.; Tardieu, F.; Turc, O..
The co-ordination between floret initiation and meristem expansion, and their relationships with carbon availability, were studied and quantified in sunflower (Helianthus annuus) plants subjected to light or water shortages.Meristem size, number of floret primordia, primordium size, rate of plant biomass accumulation, leaf area, photosynthetic rate, and soluble sugar content in the capitulum were measured until completion of floret initiation.Although treatments differentially affected tissue expansion and biomass acquisition, a common relationship between the final number of florets and the rate and duration of meristem expansion was conserved. In the absence of water deficit, changes in relative expansion rate in the meristem paralleled changes in...
Tipo: Journal Article Palavras-chave: CARBON AVAILABILITY; FLORET INITIATION; HELIANTHUS ANNUUS; SUNFLOWER; MERISTEM; SUNFLOWER CAPITULUM; TISSUE EXPANSION RATE; WATER DEFICIT.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011e12d5c13&uri=/notices/prodinra1/2011/01/
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Leaf growth rate per unit thermal time follows QTL-dependent daily patterns in hundreds of maize lines under naturally fluctuating conditions Inra
Sadok, W.; Naudin, P.; Boussuge, B.; Muller, B.; Welcker, C.; Tardieu, F..
We have analysed daily patterns of leaf elongation rate (LER) in large data sets with 318 genotypes placed in naturally fluctuating temperature and evaporative demand, and examined the effect of targeted alleles on these patterns. The method consisted, firstly, in expressing elongation rate per unit thermal time, so it became temperature independent; secondly, in a joint analysis of diurnal fluctuations of elongation rate and of micrometeorological conditions in several experiments, and finally, in a comparison of daily patterns between groups of genotypes possessing targeted alleles. (1) Conditions for using thermal time at a time step of 15 min were first tested successfully in 318 recombinant inbred lines (RILs) of three mapping populations. (2) An...
Tipo: Journal Article Palavras-chave: CROISSANCE FOLIAIRE EVAPORATIVE DEMAND; PHENOTYPING; TIME COURSE.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008f59625de&uri=/notices/prodinra1/2008/10/
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Modelling temperature-compensated physiological rates, based on the co-ordination of responses to temperature of developmental processes Inra
Parent, B.; Turc, O.; Gibon, Y.; Tardieu, F..
Temperature fluctuates rapidly and affects all developmental and metabolic processes. This often obscures the effects of developmental trends or of other environmental conditions when temperature fluctuates naturally. A method is proposed for modelling temperature-compensated rates, based on the coordination of temperature responses of developmental processes. In a data set comprising 41 experiments in the greenhouse, growth chamber, or the field, the temperature responses in the range of 6-36 degrees C for different processes were compared in three species, maize, rice, and Arabidopsis thaliana. Germination, cell division, expansive growth rate, leaf initiation, and phenology showed coordinated temperature responses and followed common laws within each...
Tipo: Journal Article Palavras-chave: DEVELOPMENT; ENZYME; GROWTH; MODELLING; PHOTOSYNTHESIS; TEMPERATURE; THERMAL TIME.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201063708b64&uri=/notices/prodinra1/2010/08/
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Quantitative trait loci and crop performance under abiotic stress: Where do we stand? Inra
Collins, N.C.; Tardieu, F.; Tuberosa, R..
The improvement of crop yield has been possible through the indirect manipulation of quantitative trait loci (QTLs) that control heritable variability of the traits and physiological mechanisms that determine biomass production and its partitioning. This article surveys how QTL-based approaches contribute to a better understanding of the genetic basis of crop performance under environmentally constrained conditions and critically analyzes how this knowledge can assist breeders accelerate the release of cultivars better able to cope with abiotic constraints.Crop performance is the end result of the action of thousands of genes and their interactions with environmental conditions and cultural practices. During the past century, conventional breeding has been...
Tipo: Journal Article Palavras-chave: QUANTITATIVE TRAIT LOCI; CROP PERFORMANCE.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20085f5c7a58&uri=/notices/prodinra1/2008/09/
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Relations entre l'etat hydrique du sol, le potentiel de base et d'autres indicateurs de la contrainte hydrique chez le maïs Inra
Tardieu, F.; Katerji, N.; Bethenod, O..
Des indicateurs de l’état hydrique du sol (potentiel hydrique dans la zone racinaire et réserve en eau utilisée) ont été mis en relation avec plusieurs indicateurs de l’état hydrique de plantes de maïs pendant la période post-floraison : le potentiel foliaire au lever du jour, le potentiel foliaire pendant la journée, la conductance stomatique et le niveau des composantes du rendement formées pendant la période de mesure. Cette mise en relation a été effectuée pour des plantes en pots, où l’état hydrique du sol et la réserve en eau sont bien définis, et, pendant 3 années, pour des plantes au champ, où les grandeurs caractérisant l’état hydrique du sol sont fortement variables spatialement. Dans les 2 cas, on a suivi l’état hydrique des plantes pour...
Tipo: Journal Article Palavras-chave: ESSAI AU CHAMP; CONDUCTANCE STOMATIQUE; INDICATEUR DE STRESS; ETAT HYDRIQUE; RESISTANCE A LA DIFFUSION; STOMATE; CULTURE EN POT.
Ano: 1990 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9100021106019753&uri=/notices/prodinra1/2009/04/
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Rice leaf growth and water potential are resilient to evaporative demand and soil water deficit once the effects of root system are neutralized Inra
Parent, B.; Suard, B.; Serraj, R.; Tardieu, F..
Rice is known to be sensitive to soil water deficit and evaporative demand, with a greatest sensitivity of lowland-adapted genotypes. We have analysed the responses of plant water relations and of leaf elongation rate (LER) to soil water status and evaporative demand in seven rice genotypes belonging to different species, subspecies, either upland- or lowland-adapted. In the considered range of soil water potential (0 to -0.6 MPa), stomatal conductance was controlled in such a way that the daytime leaf water potential was similar in well-watered, droughted or flooded conditions (isohydric behaviour). A low sensitivity of LER to evaporative demand was observed in the same three conditions, with small differences between genotypes and lower sensitivity than...
Tipo: Journal Article Palavras-chave: ISOHYDRIC; LEAF GROWTH; LEAF WATER RELATIONS; LOWLAND; UPLAND; WATER DEFICIT.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20106c98800a&uri=/notices/prodinra1/2010/08/
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Scaling up to whole-plant and crop levels short-term responses of leaf growth to water deficit Inra
Chenu, K.; Chapman, S.C.; Hammer, G.L.; McLean, G.; Fournier, C.; Tardieu, F..
Introduction : One challenge of FSPM in ecophysiology is to bridge the gap between physiological andgenetic studies that focus on short-term mechanisms, and whole-plant models designed topredict biomass accumulation, transpiration and yield in field conditions. We developed here amodel of leaf growth and development in maize and interfaced it with the crop model APSIMfor simulation at canopy level.
Tipo: Conference Paper Palavras-chave: LEAF ELONGATION; LEAF DEVELOPMENT; WATER DEFICIT; CROP MODEL.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20093acd7fff&uri=/notices/prodinra1/2009/03/
Registros recuperados: 23
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