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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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Interspecific variation in xylem vulnerability to cavitation among tropical tree and shrub species Inra
Lopez, O.; Kursar, T.; Cochard, H.; Tyree, M..
In tropical moist forests, seasonal drought limits plant survival, productivity and diversity. Drought-tolerance mechanisms of tropical species should reflect the maximum seasonal water deficits experienced in a particular habitat. We investigated stem xylem vulnerability to cavitation in nine tropical species with different life histories and habitat associations. Stem xylem vulnerability was scored as the xylem water potential causing 50 and 75% loss of hydraulic conductivity (P50 and P75, respectively). Four shade-tolerant shrubs ranged from moderately resistant (P50=-1.9 MPa for Ouratea lucens Kunth. Engl.) to highly resistant to cavitation (P50=-4.1 MPa for Psychotria horizontalis Sw.), with shallow-rooted species being the most resistant. Among the...
Tipo: Journal Article Palavras-chave: DROUGHT TOLERANCE; HYDRAULIC CONDUCTIVITY; TROPICAL RAINFOREST; WATER POTANTIAL; WATER STRESS; XYLEM CAVITATION.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2006d66b5a5e&uri=/notices/prodinra1/2008/06/
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Perennial grasses in rainfed Mediterranean farming systems - current and potential role Inra
Lelièvre, F.; Norton, M.R.; Volaire, F..
Cette revue présente un bilan du développement récent des graminées pérennes dans les régions méditerranéennes sèches, par type de système agraire. Peu de cultivars (cvs) sont inscrits et seuls ceux inscrits en France et en Australie ont des semences commercialisées. I/s ne sont significativement utilisés qu'en zones sub-tempérées. A l'avenir, les mélanges graminée-légumineuse à deux ou plusieurs composants s'imposent pour optimiser la production animale et les bénéfices environnementaux, tous deux contribuant au revenu des exploitations. Les cvs existants sont adaptés à une pluviométrie annuelle > 500 mm avec déficit climatique cumulé Mai-Septembre < 700 mm. L'utilisation croissante des pérennes fourragères en couverture dans des systèmes culturaux...
Tipo: Conference Paper Palavras-chave: GRAMINEES PERENNES; MELANGES GRAMINEE-LEGUMINEUSE; PLANTE DE COUVERTURE; PERENNITE PERENNIAL GRASSES; GRASS-LEGUME MIXTURES; PASTURES; FARMING SYSTEMS; MEDITERRANEAN C1IMATES; DROUGHT TOLERANCE; PERENNIALITY.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201024ea786e&uri=/notices/prodinra1/2010/08/
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