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Registros recuperados: 6
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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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Regional climate modulates the canopy mosaic of favourable and risky microclimates for insects Inra
Pincebourde, S.; Sinoquet, H.; Combes, D.; Casas, J..
1. One major gap in our ability to predict the impacts of climate change is a quantitative analysis of temperatures experienced by organisms under natural conditions. We developed a framework to describe and quantify the impacts of local climate on the mosaic of microclimates and physiological states of insects within tree canopies. This approach was applied to a leaf mining moth feeding on apple leaf tissues.2. Canopy geometry was explicitly considered by mapping the 3D position and orientation of more than 26 000 leaves in an apple tree. Four published models for canopy radiation interception, energy budget of leaves and mines, body temperature and developmental rate of the leaf miner were integrated. Model predictions were compared with actual...
Tipo: Journal Article Palavras-chave: ABSORBANCE; LETHAL TEMPERATURE; PHYLLONORYCTER BLANCARELLA; STOMATAL CONDUCTANCE; THERMAL ENVIRONMENT.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007812fc21e&uri=/notices/prodinra1/2008/07/
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The coupling of reducing power and stomatal conductance could improve the effective ozone uptake concept in a risk assessment model Inra
Le Thiec, D.; Jolivet, Y.; Hasenfratz- Sauder, M.P.; Bagard, M.; Dizengremel, P..
The tropospheric level of the phytotoxic air pollutant ozone has considerably increasedduring the last century and is expected to continue to rise. Long-term exposures of higherplants to low ozone concentrations affect biochemical processes prior to any detectablesymptoms of visible injury. On the other hand, the current critical level of ozone used todetermine the threshold for damaging plants (biomass loss) is still based on the seasonal sumof the external concentrations of the pollutant above 40 nl l-1 (AOT40). Taking into accountthe stomatal conductance, a more relevant concept is based upon the actual ozone flux in theleaf through the stomata (cumulative uptake of ozone = CUO). CUO however ignores theinternal capacity of leaf defense, which led to the...
Tipo: Meeting Paper Palavras-chave: STOMATAL CONDUCTANCE; OZONE; RISK ASSESSMENT.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009d2e078a3&uri=/notices/prodinra1/2010/10/
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Vulnerability to embolism differs in roots and shoots and among three Mediterranean conifers: consequences for stomatal regulation of water loss ? Inra
Froux, F.; Ducrey, M.; Dreyer, E.; Huc, R..
We investigated the potential links between stomatal control of transpiration and the risk of embolism in root and shoot xylem of seedlings of three Mediterranean conifers (Cupressus sempervirens, Pinus halepensis and P. nigra) grown in a greenhouse under semi-controlled conditions. We measured the intrinsic vulnerability to embolism in roots and current year shoots by the air injection method. Root and shoot segments were subjected to increasing pressures, and the induced loss of hydraulic conductivity recorded. The three species displayed very different vulnerabilities in shoots, with P. nigra being much more vulnerable than P. halepensis and C. sempervirens. Roots were distinctly more vulnerable than shoots in C. sempervirens and P. halepensis (50% loss...
Tipo: Journal Article Palavras-chave: CONDUCTANCE STOMATIQUE; PINUS NIGRA; EMBOLIE; PARTIE AÉRIENNE; RÉSISTANCE A LA SÉCHERESSE; RÉSINEUX PREVENTING XYLEM CAVITATION; TREE HYDRAULIC CONDUCTANCE; PINUS-SYLVESTRIS L; BETULA-OCCIDENTALIS; LAURUS-NOBILIS; SOIL DROUGHT; WOODY-PLANTS; DOUGLAS-FIR; STRESS; LEAF; XYLEM EMBOLISM; STOMATAL CONDUCTANCE; DROUGHT; CUPRESSUS SEMPERVIRENS; PINUS.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200971b90789&uri=/notices/prodinra1/2010/10/
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Water relations of adult Norway spruce (Picea abies (L) Karst) under soil drought in the Vosges mountains : whole-tree hydraulic conductance, xylem embolism and water loss regulation Inra
Lu, P.; Biron; Granier, A.; Cochard, H..
Les variations de conductances hydrauliques totales induites par une sécheresse ont été suivies tout au long d’une saison de végétation dans une parcelle de Picea abies âgés de 30 ans. gL a été calculé à partir de mesures simultanées de potentiels hydriques foliaires et de densités de flux de sève dans les troncs. Le déficit hydrique dans le sol a réduit nettement gL, cette réduction étant probablement localisée dans le compartiment sol-racine. La chute de gL n’a pas induit de diminution importante du potentiel hydrique minimum parce que les densités de flux de sève maximales ont été réduites proportionnellement à gL. Nous faisons l’hypothèse que les valeurs maximales journalières de flux de sève chez l’épicéa sont ajustées en fonction de la conductance...
Tipo: Journal Article Palavras-chave: CONDUCTANCE HYDRAULIQUE; CAVITATION; CONDUCTANCE STOMATIQUE; EMBOLIE; FLUX DE SEVE HYDRAULIC CONDUCTANCE; STOMATAL CONDUCTANCE; DROUGHT; SAP FLUX; WATER POTENTIAL.
Ano: 1996 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007bd010228&uri=/notices/prodinra1/2008/06/
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Zinc and cadmium effects on growth and ion distribution in Populus tremula × Populus alba Inra
Durand, T. C.; Hausman, J.F.; Carpin, S.; Albéric, P.; Baillif, P.; Label, P.; Morabito, D..
The effects of cadmium and zinc on growth and mineral distribution in Populus tremula × P. alba genotype 717-1B4were investigated. Exposure to 360 mg(Cd) kg-1(soil) resulted in accumulation of Cd in all organs and inhibition ofprimary and secondary growth as well as of the net photosynthetic rate. No growth inhibition occurred under zincexposure. Cd was mainly stored in the woody parts of stem, whereas zinc was preferentially localized in the leaves. Cdtreatment also altered distribution of Zn2+, Ca2+, Mg2+, K+, and Fe2+ in different organs.
Tipo: Journal Article Palavras-chave: DISTRIBUTION MINERALE; TAUX DE PHOTOSYNTHESE CONDUCTANCE STOMATIQUE MINERAL DISTRIBUTION; PHOTOSYNTHETIC RATE; STOMATAL CONDUCTANCE; HEAVY METAL.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010b8284ef2&uri=/notices/prodinra1/2010/11/
Registros recuperados: 6
Primeira ... 1 ... Última
 

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