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Registros recuperados: 13
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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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Choix de précocité et pratiques de semis en maïsiculture irriguée du Sud-Ouest de la France: quelle diversité et comment l’expliquer? Inra
Maton, L.; Burger-Leenhardt, D.; Bergez, J.E..
Le choix de précocité, facteur clé de la rentabilité de la culture de maïs, est de plus en plus considéré comme un levier de gestion de l’irrigation. Estimer les précocités semées au sein d’un territoire pourrait être nécessaire pour une bonne estimation de la demande régionale en eau d’irrigation. Afin d’identifier les facteurs explicatifs de la distribution spatiale des précocits semées au sein d’un périmètre irrigué du sud-ouest de la France, nous avons analysé les pratiques recommandées et les pratiques effectives de maïsiculteurs. Il ressort une grande diversité de pratiques qui ne permet pas de se fier aux recommandations ou d’appliquer de simples règles de liaison entre dates de semis et précocité pour en connaître la distribution spatiale.
Tipo: Journal Article Palavras-chave: ZEA MAYS; MAISICULTURE; DATE DE SEMIS; PRECOCITE; IRRIGATION; MAIZE; PRECOCITY; SOWING DATE.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009a4986be9&uri=/notices/prodinra1/2010/06/
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Effect of the structural variables of landscapes on the risks of spatial dissemination between GM and non-GM maize Inra
Le Bail, M.; Lecroart, B.; Gauffreteau, A.; Angevin, F.; Messean, A..
Crops grown from non-genetically modified seed should contain no more than 0.9% GM material. The very diverse nature of EU landscapes implies that coexistence measures must be adapted to regional conditions. Rigid rules, such as the requirement of large isolation distances everywhere, may raise the cost of coexistence measures, particularly in densely planted areas, without necessarily meeting the objectives of the European Commission.One of the objectives of the SIGMEA programme (Sustainable Introduction of GM Crops into European Agriculture is a Specific Targeted Research Project in the EC), within which this work was conducted, was to provide tools for the management of coexistence at the landscape level.We compared four contrasting maize production...
Tipo: Journal Article Palavras-chave: COEXISTANCE; GENETICALLY MODIFIDED CORP; MAIZE; REGIONAL MANAGEMENT; LANDSCAPE; CROSS POLINISATION; FIELD PATTERN; MEDIATED GENE FLOW; GM; ZEA-MAYS L.; POLLEN DISPERSAL; DISTANCE; TIME.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20108d634638&uri=/notices/prodinra1/2011/02/
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Estimation of the reduction in photosynthetic parameters (Vpmax, Vcmax) in the leaves of maize plants exposed to increasing ozone concentrations Inra
Bethenod, O.; Castell, J.F.; Roche, R.; Le Thiec, D.; Leitao, L.; Repellin, A.; ICP, International Cooperative Programme on Effects of Air Pollution on Natural Vegetation and Crops (GBR).
Tipo: Meeting Paper Palavras-chave: PHOTOSYNTHESIS; OZONE; MAIZE;  .
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20116c405cf&uri=/notices/prodinra1/2011/06/
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FIELD - A summary simulation model of the soil-crop system to analyse long-term resource interactions and use efficiencies at farm scale Inra
Tittonell, P.; Corbeels, M.; van Wijk, M.T.; Giller, K.E..
Resources for crop production are often scarce in smallholder farming systems in the tropics, particularly in sub-Saharan Africa (SSA). Decisions on the allocation of such resources are often made at farm rather than at field plot scale. To handle the uncertainty caused by both lack of data and imperfect knowledge inherent to these agricultural systems, we developed a dynamic summary model of the soil–crop system that captures essential interactions determining the short- and long-term crop productivity, while keeping a degree of simplicity that allows its parameterisation, use and dissemination in the tropics. Generic, summary functions describing crop productivity may suffice for addressing questions concerning trade-offs on resource allocation at farm...
Tipo: Journal Article Palavras-chave: ALLOCATION DES RESSOURCES SUB-SAHARAN AFRICA; MAIZE; SWEET POTATO; COTTON; SOIL ORGANIC CARBON; MODEL COMPLEXITY.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010991f7bf4&uri=/notices/prodinra1/2010/08/
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Final report on coherent scenarios for the management of co-existence : Final report on coherent “rescue” scenarios Inra
Lecroart, B.; Le Bail, M..
Tipo: Report section Palavras-chave: ORGANISME GENETIQUEMENT MODIFIE; OGM GMO; COEXISTENCE; MAIZE; SIGMEA; SCENARIO.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008844f3357&uri=/notices/prodinra1/2011/04/
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Geo-referenced indicators of maize sowing and cultivar choice for better water management Inra
Maton, L.; Leenhardt, D.; Bergez, J.E..
Agriculture is a major consumer of water, with up to 88% of the total water consumption in summer in irrigated regions, either in France or, for instance, in Australia. Good water management therefore requires an accurate estimation of regional water demand by agriculture, which depends on both soil and weather conditions and on farmers’ practices. We studied the farmers’ practices that influence maize irrigation : sowing and the choice of cultivar in regard to its earliness. Specifically, we aimed to identify geo-referenced indicators that could be used to estimate the spatial and temporal distribution of the various combinations of sowing date, sowing density, sown area and maize earliness. The study was conducted in a 500-km2 irrigated area in...
Tipo: Journal Article Palavras-chave: AGRICULTURAL PRACTICES; SPATIAL VARIABILITY; MAPPING; SOWING; EARLINESS; MAIZE; IRRIGATION; WATER MANAGEMENT; REGIONAL SCALE; PROBABILISTIC ESIMATION.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009902383b2&uri=/notices/prodinra1/2010/05/
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Identification of critical points from validated results: Effect of structural variables on GM admixture in non GM harvest based on simulation results - Alsace, Switzerland case studies - Maize Inra
Gauffreteau, A.; Le Bail, M.; CETIOM, Centre Technique Interprofessionnel des Oléagineux Métropolitains (FRA).
Tipo: Report section Palavras-chave: OGM; ORGANISME GENETIQUEMENT MODIFIE GMO; COEXISTENCE; MAIZE; SIGMEA.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200891963eeb&uri=/notices/prodinra1/2011/04/
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Identification of critical points from validated results: effect of the structural variables on GM admixture in non GM harvest based on simulation results: Aragon, Aquitaine case studies: Maize Inra
Lecroart, B.; Le Bail, M..
Tipo: Report section Palavras-chave: CEREALE; OGM; ORGANISME GENETIQUEMENT MODIFIE; EXPRESSION DES GENES GMO; COEXISTENCE; MAIZE; SIGMEA; SCENARIO.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200873d253b6&uri=/notices/prodinra1/2011/04/
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Independant management measures : Identification and management of critical points by stakeholders Inra
Lecroart, B.; Le Bail, M..
Tipo: Report section Palavras-chave: OGM; ORGANISME GENETIQUEMENT MODIFIE GMO; COEXISTENCE; MAIZE; SIGMEA.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008c7746e5a&uri=/notices/prodinra1/2010/09/
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Les cultures transgéniques tolérantes à un herbicide permettent-elles de réduire l’usage des pesticides ? Le cas du soja et du maïs aux Etats-Unis Inra
Bonny, S..
Les cultures transgéniques tolérantes à un herbicide (TH), actuellement largement prédominantes parmi les OGM, ont fait l’objet de nombreuses critiques notamment en raison de leur emploi concomitant d’herbicides. Mais celui-ci est-il similaire, plus ou moins élevé qu’en cultures conventionnelles ? L’article présente en premier lieu l’importance des cultures transgéniques TH dans le monde ainsi que dans les essais au champ aux Etats-Unis. Puis à partir du cas du soja tolérant au glyphosate, il examine les facteurs d’adoption de cette culture aux Etats-Unis où elle est très largement implantée, les avantages et les inconvénients au niveau agro-économique. Dans un troisième temps on étudie l’emploi des herbicides sur deux cultures transgéniques par...
Tipo: Journal Article Palavras-chave: BIOTECHNOLOGIE VEGETALE; DESHERBAGE; GLYPHOSATE  GMO; TRANSGENIC CROP; BIOTECHNOLOGY; HERBICIDE; PESTICIDE; WEEDING; HERBICIDE TOLERANCE; GLYPHOSATE; WEED; SOYBEAN; CORN; MAIZE; ENVIRONMENT; HERBICIDE RESISTANCE; RISK.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009e94f207d&uri=/notices/prodinra1/2009/03/
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Long-term changes in soil phosphorus status related to P budgets under maize monoculture and mineral P fertilization Inra
Messiga, A.J.; Ziadi, N.; Plénet, D.; Parent, L.E.; Morel, C..
Monitoring soil phosphorus (P) changes under continuous cropping over decades is an important agronomic and environmental issue. The aim was to determine soil P dynamics in the plough layer as a function of cumulative P budgets (Bcum) across extended cropping periods (7, 12, and 17 yr) for four rates of mineral P fertilization. This field experiment was established in 1975 on a slightly alkaline, sandy loamy soil (luvic Arenosol). Soil P was assessed by three P tests: the concentration of P ions in solution (Cp), Olsen (POl), and Mehlich-3 P (PM3). Annual P budget was calculated as P applied minus P exported by the grain. The Bcum values were the sum of annual P budgets. Bcum, Cp, POl, and PM3 values were significantly influenced by cropping periods and P...
Tipo: Journal Article Palavras-chave: FERTILIZATION; MAIZE; MONOCULTURE; PHOSPHORUS; P BUDGET; SOIL TEST P.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20118bb9a266&uri=/notices/prodinra1/2011/06/
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Voies d’amélioration des impacts environnementaux des systèmes céréaliers : une première synthèse à partir des travaux de l’INRA Inra
Abecassis, J.; Bertrand, M.; Bonny, S.; Dedryver, C.A.; Georget, M.; Nolot, J.M.; Rolland, B.; Rousset, M..
Le contexte actuel requiert une meilleure harmonie entre l'agriculture et l'environnement, aussi la recherche agronomique est-elle souvent questionnée sur ses investigations en la matière. Cet article présente le résultat d'un travail d'inventaire portant sur des voies d'amélioration des impacts environnementaux en systèmes céréaliers. Une soixantaine de travaux conduits par l’INRA en relation avec ses partenaires du monde agricole ont été répertoriés et classés en trois grands domaines : amélioration de l’efficience des intrants, substitution d’un intrant par un autre, reconception des systèmes de production. L'inventaire fait apparaître trois grands champs de recherche et d’innovations. En premier lieu, l'amélioration variétale, et en ce domaine...
Tipo: Journal Article Palavras-chave: AGROECOLOGIE; APPROCHE SYSTEMIQUE; REJET CEREALS; WHEAT; MAIZE; ENVIRONMENT; ENVIRONMENTAL IMPACT; INPUT; INPUT REDUCTION; FERTILIZATION; PESTICIDE; WATER; PLANT BREEDING; GENETIC RESSOURCES; AGROECOLOGY; AGRONOMY; ECOPHYSIOLOGY; SYSTEMIC APPROACH; FARMER; PRODUCTION SYSTEM; GREENHOUSE GAS; DECISION-MAKING TOOL; INNOVATION; INTEGRATED PEST MANAGEMENT.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201140d38deb&uri=/notices/prodinra1/2011/04/
Registros recuperados: 13
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