Encontrados 12 documentos, a visualizar página 1 de 2
Cork oak (Quercus suber L.) seedlings acclimate to elevated
Vaz. M; Cochard. H; Gazarini. L; Graça. J; Chaves. M. M; Pereira. J. SLeaf gas-exchange, leaf and shoot anatomy, wood density and hydraulic conductivity were investigated in seedlings of Quercus suber L. grown for 15 months either at elevated (700 lmol mol-1) or normal (350 lmol mol-1) ambient atmospheric CO2 concentrations. Plants were grown in greenhouses in a controlled environment: relative humidity 50% (±5), temperature similar to external temperature and natural light condi...
Calibration and validation of SALTMED model under dry and wet year conditions u...
Silva, L.L.; Ragab, R.; Duarte, I.; Lourenço, E.; Simões, N.; Chaves, M.M.The SALTMED model is one of the few available generic models that can be used to simulate crop growth with an integrated approach that accounts for water, crop, soil, and field management. It is a physically based model using the well-known water and solute transport, evapotranspiration, and water uptake equations. In this paper, the model simulated chickpea growth under different irrigation regimes and a Medit...
Grapevine varieties exhibiting differences in stomatal response to water deficit
Costa, Joaquim M.; Ortunõ, Maria F.; Lopes, Carlos M.; Chaves, M.M.Abstract. Knowledge on variety traits and physiological responses to stress is still scarce in Vitis vinifera L., limiting the optimisation of irrigation and breeding for high water use efficiency. We have characterised five grapevine varieties using thermal imaging, leaf gas exchange, leaf morphology and carbon isotope composition. Plants of the varieties Aragonez, Trincadeira, Cabernet Sauvignon, Syrah and To...
Impact of irrigation regime on berry development and flavonoids composition in ...
Zarrouk, Olfa; Francisco, Rita; Pinto-Marijuan, Marta; Brossa, Ricardo; Santos, Raquen Raissa; Pinheiro, Carla; Costa, Joaquim M.; Lopes, Carlos M.In the present study, field grown Aragonez (Syn. Tempranillo) grapevines (Vitis vinifera L.) were subjected to three irrigation regimes (conventional sustained deficit irrigation (DI), regulated deficit irrigation (RDI) and non-irrigated (NI)) during two successive seasons (2007–2008). An integrative study was performed in grape berry skin tissues at four phenological stages of grape berry (pea size, véraison, ...
Comparing water relations and stomatal regulation of Touriga Nacional and Syrah...
Lopes, Carlos; Monteiro, Ana; Chaves, M.M.Proceedings - IX International Terroir Congress, 2012 ; Aiming to compare the physiological responses of the Portuguese red variety Touriga Nacional (TN) with Syrah (SY), we studied during the 2007 growing season five-year-old grapevines growing in a commercial non-irrigated vineyard located at the Lisbon winegrowing region. Predawn (Ypd) and midday (YM) leaf water potential, leaf stomatal conductance (gs) and...
Deficit irrigation in Mediterranean vineyards - a tool to increase water use ef...
Costa, J.M.; Lopes, C.M.; Rodrigues, M.L.; Santos, T.P.; Francisco, R.; Zarrouk, O.; Regalado, A.; Chaves, M.M.IHC - IS Viti&Climate: Effect of Climate Change on Production and Quality of Grapevines and their Products, 28 th, 2012 ; Water is increasingly scarce in Mediterranean Europe and irrigated agriculture is one of the largest and most inefficient users of this natural resource. Ecological topics such as the “water foot print” have become more relevant for the academy, consumers, governments and food industry. The...
Drought-induced photosynthetic inhibition and autumn recovery in two Mediterran...
Vaz, M.; Pereira, J.S.; Gazarini, L.C.; David, T.S.; David, J.S.; Rodrigues, A; Maroco, J; Chaves, M.M.Responses of leaf water relations and photosynthesis to summer drought and autumn rewetting were studied in two evergreen Mediterranean oak species, Quercus ilex spp. rotundifolia and Quercus suber. The predawn leaf water potential (ΨlPD), stomatal conductance (gs) and photosynthetic rate (A) at ambient conditions were measured seasonally over a 3-year period. We also measured the photosynthetic response to lig...
Deficit irrigation in Mediterranean environment. What lessons have we learnt fr...
Chaves, M.M.; Zarrouk, O.; Francisco, R.; Costa, J.M.; Santos, T.; Regalado, A.P.; Rodrigues, M.L.; Lopes, C.Libro de Actas - X Simposium Hispano Português de Relaciones Hidricas, 2010 ; Deficit irrigation techniques, implying that water is supplied at levels below full crop evapotranspiration throughout the growing season or in specific phenological stages, such as regulated deficit irrigation (RDI) or partial root drying (PRD), emerged as potential strategies to increase water savings with marginal decreases of yie...
Grapevine under deficit irrigation: hints from physiological and molecular data
Chaves, M.M.; Zarrouk, O.; Francisco, R.; Costa, J.M.; Santos, T.; Regalado, A.P.; Rodrigues, M.L.; Lopes, C.M.Background - A large proportion of vineyards are located in regions with seasonal drought (e.g. Mediterraneantype climates) where soil and atmospheric water deficits, together with high temperatures, exert large constraints on yield and quality. The increasing demand for vineyard irrigation requires an improvement in the efficiency of water use. Deficit irrigation has emerged as a potential strategy to allow c...
Physiological and biochemical responses to low non-freezing temperature of two ...
Shvaleva, A.; Silva, F.C.; Scotti, P.; Oufir, M.; Hausman, J.-F.; Cedric, G.; Ramos, P.; Almeida, M.H.; Rodrigues, M.L.; Pereira, J.S.; Chaves, M.M.Abstract – We have compared the metabolic responses of leaves and roots of two Eucalyptus globulus L. clones CN5 and ST51 that differ in their sensitivity to water deficits (ST51 is more drought sensitive), with regard to the effect of chilling (10/5 ◦C, day/night). We studied changes in growth, osmotic potential and osmotically active compounds, soluble proteins, leaf pigments, and membrane lipid composition. ...
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