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A method for drought tolerance screening in sunflower Inra
Pereyra-Irujo, G.A.; Velazquez, L.; Granier, C.; Aguirrezabal, L.A.N..
One difficulty in obtaining drought-tolerant varieties is the unequivocal evaluation of plant response to soil-water deficits. A method is proposed that allows reproducible soil-water deficit treatments to be applied to different sunflower genotypes. Maize (Zea mays L.) plants were sown in the same pots as but earlier than some sunflower plants in order to rapidly deplete the soil water. This method was compared to a standard method in which plants under evaluation are used to dry out the soil. The method was reproducible in the evaluation of drought tolerance of four sunflower inbred lines. Advantages of the proposed method are that: (i) it allows the desired soil water content to be reached quickly; (ii) the resulting soil water content in the pot is...
Tipo: Journal Article Palavras-chave: DROUGHT TOLERANCE; WATER DEFICIT; LEAF AREA; WATER DEPLETION RATE; SOIL WATER DISTRIBUTION.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20088e4335dc&uri=/notices/prodinra1/2008/09/
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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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Growth and yield of rice (Oryza sativa L.) as affected by cultivars, seeding depth and water deficits at vegetative stage Inra
Sanusan, S.; Polthanee, A.; Audebert, A.; Seripong, S.; Mouret, J.C..
This study investigates the effects of different seeding depths and water stress on growth and yield of direct-seeded rice. The experiment was a 3x2x2 factorial in a randomized complete block design with four replications. The main factors (03) were seeding depths (0, 1 and 5 cm), water level (well watered and water stress at 30 days after seeding (DAS) and rice cultivars (Pathum Thani 1 and Suphan Buri 1). Above-ground biomass and root length density were significantly affected by rice cultivars, seeding depths and water stress. The Suphan Buri 1 had a higher above ground biomass and root length density than the Pathum Thani 1. At the first 7 days of water stress, maximum above-ground biomass was obtained at 1 cm seeding depth. But at a later stage, the...
Tipo: Journal Article Palavras-chave: ABOVE-GROUND BIOMASS; RELATIVE WATER CONTENT; ROOT LENGTH DENSITY; SEEDING DEPTH; WATER DEFICIT.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010660e7e2a&uri=/notices/prodinra1/2010/10/
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Molecular bases of acclimation to water deficit in poplar mature leaves Inra
Cohen, D.; Hummel, I.; Balzergue, S.; Magniette, M.L.; Tisserant, E.; Le Thiec, D.; Dreyer, E.; Renou, J.P.; Bogeat, M.B..
In temperate zones the global change will include a decrease of summer precipitations inducing longer and more severe drought episodes. Transcriptional regulation plays a major role in regulating many biological processes, we looked for gene expression networks related to drought stress. The final aim is to identify candidate genes for water deficit acclimation and/or adaptation in poplar, a model tree species. The transcriptome of two Populus deltoides x nigra genotypes of contrasted tolerance to water deficit (Carpaccio and Soligo) were analysed in young mature leaves, at various stages and intensities of stress. Four watering treatments were applied: control (CTL) watered to field capacity six-times a day; early response to water deficit (EAR): watering...
Tipo: Meeting Paper Palavras-chave: MOLECULAR; WATER DEFICIT; POPLAR .
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009e68e7beb&uri=/notices/prodinra1/2010/11/
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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/
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Short-term responses of leaf growth rate to water deficit scale up to whole-plant and crop levels: an integrated modelling approach in maize Inra
Chenu, K.; Chapman, S.C.; Hammer, G.L.; McLean, G.; Ben Haj Salah, H.; Tardieu, F..
Physiological and genetic studies of leaf growth often focus on short-term responses, leaving a gap to whole-plant models that predict biomass accumulation, transpiration and yield at crop scale. To bridge this gap, we developed a model that combines an existing model of leaf 6 expansion in response to short-term environmental variations with a model coordinating the development of all leaves of a plant. The latter was based on: (1) rates of leaf initiation, appearance and end of elongation measured in field experiments; and (2) the hypothesis of an independence of the growth between leaves. The resulting whole-plant leaf model was integrated into the generic crop model APSIM which provided dynamic feedback of environmental conditions to the leaf model and...
Tipo: Journal Article Palavras-chave: CROP MODEL; DEVELOPMENT; LEAF AREA; LEAF ELONGATION; TEMPERATURE; VAPOUR PRESSURE DEFICIT; WATER DEFICIT.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200895e1eb25&uri=/notices/prodinra1/2008/09/
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Stomatal behavior of different grapevine cultivars in response to soil water status and air water vapor pressure deficit Inra
Prieto, J.A.; Lebon, E.; Ojeda, H..
Objectifs : La variabilité génétique existante chez les cépages de vigne peut affecter leur stratégie d’adaptation à la sécheresse en régulant la transpiration au travers de la fermeture des stomates. L’objectif du travail a été d’évaluer la sensibilité des stomates de cinq cultivars (Ekigaïna, Grenache, Marselan, Mourvèdre et Syrah) à la disponibilité en eau du sol et au déficit de pression de vapeur (VPD). Méthodes et résultats : Les échanges gazeux des feuilles et l’efficience d’interception du rayonnement (ei) ont été évalués dans une large gamme des valeurs de potentiel hydrique de base (yPD) en conditions de terrain dans le Sud de la France. En outre, une expérimentation complémentaire en serre a été réalisée pour analyser la réponse des stomates...
Tipo: Journal Article Palavras-chave: STOMATE; MOURVEDRE; SYRAH; EKIGAINA; GRENACHE; MARSELAN; ANISOHYDRIQUE ; ISOHYDRIQUE; EFFICIENCE D'UTILISATION DE L'EAU; VPD; DEFICIT DE PRESSION DE VAPEUR ANISOHYDRIC ; GENETIC VARIABILITY; ISOHYDRIC PHOTOSYNTHESIS; VPD; WATER DEFICIT; WATER USE EFFICIENCY.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20108cdc355d&uri=/notices/prodinra1/2010/08/
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Water deficit and induction of summer dormancy in perennial mediterranean grasses Inra
Volaire, F.; Seddaiu, G.; Ledda, L.; Lelièvre, F..
Background and Aims: Summer dormancy is a trait conferring superior drought survival in Mediterranean perennial grasses. As the respective roles of environmental factors and water deficit on induction of summer dormancy are unclear, the effect of intense drought were tested under contrasting day lengths in a range of forage and native grasses. Methods: Plants of Poa bulbosa, Dactylis glomerata ‘Kasbah’ and Lolium arundinaceum ‘Flecha’ were grown in pots (a) from winter to summer in a glasshouse and subjected to either an early or a late-spring drought period followed by a summer water deficit and (b) in controlled conditions, with long days (LD, 16 h) or short days (SD, 9 h) and either full irrigation or water deficit followed by rehydration. Leaf...
Tipo: Journal Article Palavras-chave: DORMANCE ESTIVALE; GRAMINEES PERENNES; PHOTOPERIODE POA BULBOSA; LOLIUM ARUNDINACEUM; ABSCISIC ACID; WATER DEFICIT; PHOTOPERIOD; SUMMER DORMANCY; PERENNIAL GRASS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010987d1002&uri=/notices/prodinra1/2010/08/
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Water deficits uncouple growth from photosynthesis, increase C content, and modify the relationships between C and growth in sink organs Inra
Muller, B.; Pantin, F.; Génard, M.; Turc, O.; Freixes, S.; Piques, M.; Gibon, Y..
In plants, carbon (C) molecules provide building blocks for biomass production, fuel for energy, and exert signalling roles to shape development and metabolism. Accordingly, plant growth is well correlated with light interception and energy conversion through photosynthesis. Because water deficits close stomata and thus reduce C entry, it has been hypothesised that droughted plants are under C starvation and their growth under C limitation. In this review, these points are questioned by combining literature review with experimental and modelling illustrations in various plant organs and species. First, converging evidence is gathered from the literature that water deficit generally increases C concentration in plant organs. The hypothesis is raised that...
Tipo: Journal Article Palavras-chave: C METABOLISM; C SIGNALLING; GROWTH; MODEL; SINK LIMITATION; SOURCE LIMITATION; STARCH; SUGAR; WATER DEFICIT.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201178b31f14&uri=/notices/prodinra1/2011/06/
Registros recuperados: 10
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