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Author Aguilos, M.; Stahl, C.; Burban, B.; Hérault, B.; Courtois, E.; Coste, S.; Wagner, F.; Ziegler, C.; Takagi, K.; Bonal, D. pdf  url
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  Title Interannual and seasonal variations in ecosystem transpiration and water use efficiency in a tropical rainforest Type Journal Article
  Year 2018 Publication Forests Abbreviated Journal Forests  
  Volume 10 Issue 1 Pages  
  Keywords Drought; Evapotranspiration; Radiation; Tropical rainforest; Water use efficiency; Atmospheric radiation; Carbon dioxide; Climate change; Drought; Efficiency; Evapotranspiration; Forestry; Heat radiation; Radiation effects; Soil moisture; Tropics; Water supply; Climate condition; Drought conditions; Interannual variability; Mechanistic models; Seasonal variation; Tropical ecosystems; Tropical rain forest; Water use efficiency; Ecosystems  
  Abstract Warmer and drier climates over Amazonia have been predicted for the next century with expected changes in regional water and carbon cycles. We examined the impact of interannual and seasonal variations in climate conditions on ecosystem-level evapotranspiration (ET) and water use efficiency (WUE) to determine key climatic drivers and anticipate the response of these ecosystems to climate change. We used daily climate and eddyflux data recorded at the Guyaflux site in French Guiana from 2004 to 2014. ET and WUE exhibited weak interannual variability. The main climatic driver of ET and WUE was global radiation (Rg), but relative extractable water (REW) and soil temperature (Ts) did also contribute. At the seasonal scale, ET and WUE showed a modal pattern driven by Rg, with maximum values for ET in July and August and for WUE at the beginning of the year. By removing radiation effects during water depleted periods, we showed that soil water stress strongly reduced ET. In contrast, drought conditions enhanced radiation-normalized WUE in almost all the years, suggesting that the lack of soil water had a more severe effect on ecosystem evapotranspiration than on photosynthesis. Our results are of major concern for tropical ecosystem modeling because they suggest that under future climate conditions, tropical forest ecosystems will be able to simultaneously adjust CO2 and H2O fluxes. Yet, for tropical forests under future conditions, the direction of change in WUE at the ecosystem scale is hard to predict, since the impact of radiation on WUE is counterbalanced by adjustments to soil water limitations. Developing mechanistic models that fully integrate the processes associated with CO2 and H2O flux control should help researchers understand and simulate future functional adjustments in these ecosystems.  
  Address Hokkaido University, Sapporo, 060-0808, Japan  
  Corporate Author (up) Thesis  
  Publisher Mdpi Ag Place of Publication Editor  
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  Series Editor Series Title Abbreviated Series Title  
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  ISSN 19994907 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 1 February 2019; Correspondence Address: Bonal, D.; Université de Lorraine, AgroParisTech, INRA, UMR SilvaFrance; email: damien.bonal@inra.fr; References: Von Randow, C., Zeri, M., Restrepo-Coupe, N., Muza, M.N., de Gonçalves, L.G.G., Costa, M.H., Araujo, A.C., Saleska, S.R., Interannual variability of carbon and water fluxes in Amazonian forest, Cerrado and pasture sites, as simulated by terrestrial biosphere models (2013) Agric. For. Meteorol, 182-183, pp. 145-155; Duffy, P.B., Brando, P., Asner, G.P., Field, C.B., Projections of future meteorological drought and wet periods in the Amazon (2015) Proc. Natl. Acad. Sci. USA, 112, pp. 13172-13177; Cox, P.M., Betts, R.A., Collins, M., Harris, P.P., Huntingford, C., Jones, C.D., Amazonian forest dieback under climate-carbon cycle projections for the 21st century (2004) Theor. Appl. Climatol, 78, pp. 137-156; Poulter, B., Hattermann, F., Hawkins, E., Zaehle, S., Sitch, S., Restrepo-Coupe, N., Heyder, U., Cramer, W., Robust dynamics of Amazon dieback to climate change with perturbed ecosystem model parameters (2010) Glob. Chang. Biol, 16, pp. 2476-2495; Saleska, S.R., Didan, K., Huete, A.R., Da Rocha, H.R., Amazon forests green-up during 2005 drought (2007) Science, 318, p. 612; Phillips, O.L., Aragão, L.E.O.C., Lewis, S.L., Fisher, J.B., Lloyd, J., López-González, G., Malhi, Y., Quesada, C.A., Drought sensitivity of the amazon rainforest (2009) Science, 323, pp. 1344-1347; Bonal, D., Burban, B., Stahl, C., Wagner, F., Hérault, B., The response of tropical rainforests to drought-Lessons from recent research and future prospects (2016) Ann. For. Sci, 73, pp. 27-44; Wang, K.C., Dickinson, R.E., A review of global terrestrial evapotranspiration: Observation, modeling, climatology, and climatic variability (2012) Rev. Geophys, p. 50; Fisher, R.A., Williams, M., da Costa, A.L., Malhi, Y., da Costa, R.F., Almeida, S., Meir, P., The response of an Eastern Amazonian rain forest to drought stress: Results and modelling analyses from a throughfall exclusion experiment (2007) Glob. Chang. Biol, 13, pp. 2361-2378; Costa, M.H., Biajoli, M.C., Sanches, L., Malhado, A.C.M., Hutyra, L.R., Da Rocha, H.R., Aguiar, R.G., De Araújo, A.C., Atmospheric versus vegetation controls of Amazonian tropical rain forest evapotranspiration: Are the wet and seasonally dry rain forests any different? (2010) J. Geophys. Res. Biogeosci, 115, pp. 1-9; Carswell, F.E., Costa, A.L., Palheta, M., Malhi, Y., Meir, P., Costa, J.D.P.R., Ruivo, M.D.L., Clement, R.J., Seasonality in CO2 and H2O flux at an eastern Amazonian rain forest (2002) J. Geophys. Res. D Atmos, 107, p. 8076; Hasler, N., Avissar, R., What controls evapotranspiration in the Amazon basin? (2007) J. 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Plant Physiol, 40, pp. 503-537; Hutyra, L.R., Munger, J.W., Saleska, S.R., Gottlieb, E., Daube, B.C., Dunn, A.L., Amaral, D.F., Wofsy, S.C., Seasonal controls on the exchange of carbon and water in an Amazonian rain forest (2007) J. Geophys. Res. Biogeosci; Negrón Juárez, R.I., Hodnett, M.G., Fu, R., Gouden, M.L., von Randow, C., Control of dry season evapotranspiration over the Amazonian forest as inferred from observation at a Southern Amazon forest site (2007) J. Clim, 20, pp. 2827-2839; Fisher, J.B., Malhi, Y., Bonal, D., Da Rocha, H.R., De Araújo, A.C., Gamo, M., Goulden, M.L., Kondo, H., The land-atmosphere water flux in the tropics (2009) Glob. Chang. Biol; Christoffersen, B.O., Restrepo-Coupe, N., Arain, M.A., Baker, I.T., Cestaro, B.P., Ciais, P., Fisher, J.B., Gulden, L., Mechanisms of water supply and vegetation demand govern the seasonality and magnitude of evapotranspiration in Amazonia and Cerrado (2014) Agric. For. Meteorol, 191, pp. 33-50; Da Costa, A.C.L., Rowland, L., Oliveira, R.S., Oliveira, A.A.R., Binks, O.J., Salmon, Y., Vasconcelos, S.S., Poyatos, R., Stand dynamics modulate water cycling and mortality risk in droughted tropical forest (2018) Glob. Chang. Biol; Huang, M., Piao, S., Sun, Y., Ciais, P., Cheng, L., Mao, J., Poulter, B., Wang, Y., Change in terrestrial ecosystem water-use efficiency over the last three decades (2015) Glob. Chang. Biol; Brienen, R.J.W., Wanek, W., Hietz, P., Stable carbon isotopes in tree rings indicate improved water use efficiency and drought responses of a tropical dry forest tree species (2011) Trees, 25, pp. 103-113; Yu, G., Song, X., Wang, Q., Liu, Y., Guan, D., Yan, J., Sun, X., Wen, X., Water-use efficiency of forest ecosystems in eastern China and its relations to climatic variables (2008) New Phytol, 177, pp. 927-937; Aguilos, M., Hérault, B., Burban, B., Wagner, F., Bonal, D., What drives long-term variations in carbon flux and balance in a tropical rainforest in French Guiana? Agric (2018) For. Meteorol, pp. 253-254; Bonal, D., Bosc, A., Ponton, S., Goret, J.Y., Burban, B.T., Gross, P., Bonnefond, J.M., Epron, D., Impact of severe dry season on net ecosystem exchange in the Neotropical rainforest of French Guiana (2008) Glob. Chang. Biol; Aubinet, M., Grelle, A., Ibrom, A., Rannik, U., Moncrieff, J.B., Foken, T., Kowalski, A.S., Bernhofer, C., Estimates of the annual net carbon and water exchange of forests: The Euroflux methodology (2000) Adv. Ecol. Res, 30, pp. 113-175; Wagner, F., Hérault, B., Stahl, C., Bonal, D., Rossi, V., Modeling water availability for trees in tropical forests (2011) Agric. For. Meteorol, 151, pp. 1202-1213; Kuglitsch, F.G., Reichstein, M., Beer, C., Carrara, A., Ceulemans, R., Granier, A., Janssens, I.A., Loustau, D., Characterisation of ecosystem water-use efficiency of european forests from eddy covariance measurements (2008) Biogeosci. Discuss, 5, pp. 4481-4519; Dekker, S.C., Groenendijk, M., Booth, B.B.B., Huntingford, C., Cox, P.M., Spatial and temporal variations in plant water-use efficiency inferred from tree-ring, eddy covariance and atmospheric observations (2016) Earth Syst. Dyn, 7, pp. 525-533; Yang, Y., Guan, H., Batelaan, O., McVicar, T.R., Long, D., Piao, S., Liang, W., Simmons, C.T., Contrasting responses of water use efficiency to drought across global terrestrial ecosystems (2016) Sci. Rep, 6, p. 23284; Granier, A., Bréda, N., Biron, P., Villette, S., A lumped water balance model to evaluate duration and intensity of drought constraints in forest stands (1999) Ecol. Model, 116, pp. 269-283; Kume, T., Takizawa, H., Yoshifuji, N., Tanaka, K., Tantasirin, C., Tanaka, N., Suzuki, M., Impact of soil drought on sap flow and water status of evergreen trees in a tropical monsoon forest in northern Thailand (2007) For. Ecol. Manag, 238, pp. 220-230; Xiao, J., Sun, G., Chen, J., Chen, H., Chen, S., Dong, G., Gao, S., Han, S., Carbon fluxes, evapotranspiration, and water use efficiency of terrestrial ecosystems in China (2013) Agric. For. Meteorol; Boese, S., Jung, M., Carvalhais, N., Reichstein, M., The importance of radiation for semi-empirical water-use efficiency models (2017) Biogeosciences, 14, pp. 3015-3026; Bonal, D., Ponton, S., Le Thiec, D., Richard, B., Ningre, N., Hérault, B., Ogée, J., Sabatier, D., Leaf functional response to increasing atmospheric CO2 concentrations over the last century in two northern Amazonian tree species: An historical δ13C and δ18O approach using herbarium samples (2011) Plant Cell Environ, 34, pp. 1332-1344; Wagner, F., Rossi, V., Stahl, C., Bonal, D., Hérault, B., Water availability is the main climate driver of neotropical tree growth (2012) PLoS ONE, 7; Van der Molen, M.K., Dolman, A.J., Ciais, P., Eglin, T., Gobron, N., Law, B.E., Meir, P., Reichstein, M., Drought and ecosystem carbon cycling (2011) Agric. For. Meteorol, 151, pp. 765-773; Allen, C.D., Macalady, A.K., Chenchouni, H., Bachelet, D., McDowell, N., Vennetier, M., Kitzberger, T., Hogg, E.H., A global overview of drought and heat-induced tree mortality reveals emerging climate change risks for forests (2010) For. Ecol. Manag, 259, pp. 660-684; Da Rocha, H.R., Goulden, M.L., Miller, S.D., Menton, M.C., Pinto, L.D., De Freitas, H.C., Seasonality of water and heat fluxes over a tropical forest in eastern Amazonia (2004) Ecol. Appl, 14, pp. 22-32; Baldocchi, D., Falge, E., Gu, L., Olson, R., Hollinger, D., Running, S., Anthoni, P., Evans, R., FLUXNET: A New tool to study the temporal and spatial variability of ecosystem-scale carbon dioxide, water vapor, and energy flux densities (2001) Bull. Am. Meteorol. Soc, 82, pp. 2415-2434; Stahl, C., Hérault, B., Rossi, V., Burban, B., Bréchet, C., Bonal, D., Depth of soil water uptake by tropical rainforest trees during dry periods: Does tree dimension matter? (2013) Oecologia, 173, pp. 1191-1201; Nepstad, D.C., De Carvalho, C.R., Davidson, E.A., Jipp, P.H., Lefebvre, P.A., Negreiros, G.H., Da Silva, E.D., Vieira, S., The role of deep roots in the hydrological and carbon cycles of Amazonian forests and pastures (1994) Nature; Lee, J.-E., Boyce, K., Impact of the hydraulic capacity of plants on water and carbon fluxes in tropical South America (2010) J. Geophys. Res; Xiao, X., Zhang, Q., Saleska, S., Hutyra, L., De Camargo, P., Wofsy, S., Frolking, S., Moore, B., Satellite-based modeling of gross primary production in a seasonally moist tropical evergreen forest (2005) Remote Sens. Environ, 94, pp. 105-122; Wagner, F.H., Hérault, B., Bonal, D., Stahl, C., Anderson, L.O., Baker, T.R., Becker, G.S., Botosso, P.C., Climate seasonality limits leaf carbon assimilation and wood productivity in tropical forests (2016) Biogeosciences, 13, pp. 2537-2562; Stahl, C., Burban, B., Wagner, F., Goret, J.-Y., Bompy, F., Bonal, D., Influence of Seasonal Variations in Soil Water Availability on Gas Exchange of Tropical Canopy Trees (2013) Biotropica, 45, pp. 155-164; Maréchaux, I., Bonal, D., Bartlett, M.K., Burban, B., Coste, S., Courtois, E.A., Dulormne, M., Mirabel, A., Dry-season decline in tree sapflux is correlated with leaf turgor loss point in a tropical rainforest (2018) Funct. Ecol, 32, pp. 2285-2297; Chaves, M.M., Maroco, J.P., Pereira, J.S., Understanding plant responses to drought-from genes to the whole plant (2003) Funct. Plant Biol, 30, pp. 239-264 Approved no  
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Author Ziegler, C.; Coste, S.; Stahl, C.; Delzon, S.; Levionnois, S.; Cazal, J.; Cochard, H.; Esquivel-Muelbert, A.; Goret, J.-Y.; Heuret, P.; Jaouen, G.; Santiago, L.S.; Bonal, D. url  doi
openurl 
  Title Large hydraulic safety margins protect Neotropical canopy rainforest tree species against hydraulic failure during drought Type Journal Article
  Year 2019 Publication Annals of Forest Science Abbreviated Journal Ann. Forest Sci.  
  Volume 76 Issue 4 Pages 115  
  Keywords Amazon rainforest; Embolism resistance; Hydraulic safety margins; Turgor loss point; Water potential  
  Abstract Key message: Abundant Neotropical canopy-tree species are more resistant to drought-induced branch embolism than what is currently admitted. Large hydraulic safety margins protect them from hydraulic failure under actual drought conditions. Context: Xylem vulnerability to embolism, which is associated to survival under extreme drought conditions, is being increasingly studied in the tropics, but data on the risk of hydraulic failure for lowland Neotropical rainforest canopy-tree species, thought to be highly vulnerable, are lacking. Aims: The purpose of this study was to gain more knowledge on species drought-resistance characteristics in branches and leaves and the risk of hydraulic failure of abundant rainforest canopy-tree species during the dry season. Methods: We first assessed the range of branch xylem vulnerability to embolism using the flow-centrifuge technique on 1-m-long sun-exposed branches and evaluated hydraulic safety margins with leaf turgor loss point and midday water potential during normal- and severe-intensity dry seasons for a large set of Amazonian rainforest canopy-tree species. Results: Tree species exhibited a broad range of embolism resistance, with the pressure threshold inducing 50% loss of branch hydraulic conductivity varying from − 1.86 to − 7.63 MPa. Conversely, we found low variability in leaf turgor loss point and dry season midday leaf water potential, and mostly large, positive hydraulic safety margins. Conclusions: Rainforest canopy-tree species growing under elevated mean annual precipitation can have high resistance to embolism and are more resistant than what was previously thought. Thanks to early leaf turgor loss and high embolism resistance, most species have a low risk of hydraulic failure and are well able to withstand normal and even severe dry seasons. © 2019, The Author(s).  
  Address Smithsonian Tropical Research Institute, Balboa, Ancon, Panama  
  Corporate Author (up) Thesis  
  Publisher Springer Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 12864560 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 901  
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Author Levionnois, S.; Coste, S.; Nicolini, E.; Stahl, C.; Morel, H.; Heuret, P. url  doi
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  Title Scaling of petiole anatomies, mechanics and vasculatures with leaf size in the widespread Neotropical pioneer tree species Cecropia obtusa Trécul (Urticaceae) Type Journal Article
  Year 2020 Publication Tree physiology Abbreviated Journal Tree Physiol.  
  Volume 40 Issue 2 Pages 245-258  
  Keywords allometry; leaf size; petiole anatomy; scaling; theoretical hydraulic conductivity; vessel widening; xylem  
  Abstract Although the leaf economic spectrum has deepened our understanding of leaf trait variability, little is known about how leaf traits scale with leaf area. This uncertainty has resulted in the assumption that leaf traits should vary by keeping the same pace of variation with increases in leaf area across the leaf size range. We evaluated the scaling of morphological, tissue-surface and vascular traits with overall leaf area, and the functional significance of such scaling. We examined 1,271 leaves for morphological traits, and 124 leaves for anatomical and hydraulic traits, from 38 trees of Cecropia obtusa Trécul (Urticaceae) in French Guiana. Cecropia is a Neotropical genus of pioneer trees that can exhibit large laminas (0.4 m2 for C. obtusa), with leaf size ranging by two orders of magnitude. We measured (i) tissue fractions within petioles and their second moment of area, (ii) theoretical xylem hydraulic efficiency of petioles and (iii) the extent of leaf vessel widening within the hydraulic path. We found that different scaling of morphological trait variability allows for optimisation of lamina display among larger leaves, especially the positive allometric relationship between lamina area and petiole cross-sectional area. Increasing the fraction of pith is a key factor that increases the geometrical effect of supportive tissues on mechanical rigidity and thereby increases carbon-use efficiency. We found that increasing xylem hydraulic efficiency with vessel size results in lower leaf lamina area: xylem ratios, which also results in potential carbon savings for large leaves. We found that the vessel widening is consistent with hydraulic optimisation models. Leaf size variability modifies scaling of leaf traits in this large-leaved species. © The Author(s) 2020. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permission@oup.com.  
  Address UMR AMAP, CIRAD, CNRS, IRD, Université de Montpellier, Montpellier, 34398, France  
  Corporate Author (up) Thesis  
  Publisher NLM (Medline) Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 17584469 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 16 March 2020 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 921  
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Author Levionnois, S.; Tysklind, N.; Nicolini, E.; Ferry, B.; Troispoux, V.; Le Moguedec, G.; Morel, H.; Stahl, C.; Coste, S.; Caron, H.; Heuret, P. pdf  url
doi  openurl
  Title Soil variation response is mediated by growth trajectories rather than functional traits in a widespread pioneer Neotropical tree Type Journal Article
  Year 2020 Publication bioRxiv, peer-reviewed by Peer Community in Ecology Abbreviated Journal  
  Volume 351197 Issue v4 Pages  
  Keywords  
  Abstract Trait-environment relationships have been described at the community level across tree species. However, whether interspecific trait-environment relationships are consistent at the intraspecific level is yet unknown. Moreover, we do not know how consistent is the response between organ vs. whole-tree level.We examined phenotypic variability for 16 functional leaf (dimensions, nutrient, chlorophyll) and wood traits (density) across two soil types, Ferralitic Soil (FS) vs. White Sands (WS), on two sites for 70 adult trees of Cecropia obtusa Trécul (Urticaceae) in French Guiana. Cecropia is a widespread pioneer Neotropical genus that generally dominates early successional forest stages. To understand how soil types impact resource-use through the processes of growth and branching, we examined the architectural development with a retrospective analysis of growth trajectories. We expect soil types to affect both, functional traits in relation to resource acquisition strategy as already described at the interspecific level, and growth strategies due to resource limitations with reduced growth on poor soils.Functional traits were not involved in the soil response, as only two traits-leaf residual water content and K content-showed significant differences across soil types. Soil effects were stronger on growth trajectories, with WS trees having the slowest growth trajectories and less numerous branches across their lifespan.The analysis of growth trajectories based on architectural analysis improved our ability to characterise the response of trees with soil types. The intraspecific variability is higher for growth trajectories than functional traits for C. obtusa, revealing the complementarity of the architectural approach with the functional approach to gain insights on the way trees manage their resources over their lifetime. Soil-related responses of Cecropia functional traits are not the same as those at the interspecific level, suggesting that the effects of the acting ecological processes are different between the two levels. Apart from soil differences, much variation was found across sites, which calls for further investigation of the factors shaping growth trajectories in tropical forests.  
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  Call Number EcoFoG @ webmaster @ Serial 931  
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Author Svensk, M.; Coste, S.; Gérard, B.; Gril, E.; Julien, F.; Maillard, P.; Stahl, C.; Leroy, C. doi  openurl
  Title Drought effects on resource partition and conservation among leaf ontogenetic stages in epiphytic tank bromeliads Type Journal Article
  Year 2020 Publication Physiologia Plantarum Abbreviated Journal Physiol. Plant.  
  Volume 170 Issue 4 Pages 488-507  
  Keywords chlorophyll; nitrogen; water; Bromeliaceae; drought; metabolism; photosynthesis; plant leaf; Bromeliaceae; Chlorophyll; Droughts; Nitrogen; Photosynthesis; Plant Leaves; Water  
  Abstract Studying the response to drought stress of keystone epiphytes such as tank bromeliads is essential to better understand their resistance capacity to future climate change. The objective was to test whether there is any variation in the carbon, water and nutrient status among different leaf ontogenetic stages in a bromeliad rosette subjected to a gradient of drought stress. We used a semi-controlled experiment consisting in a gradient of water shortage in Aechmea aquilega and Lutheria splendens. For each bromeliad and drought treatment, three leaves were collected based on their position in the rosette and several functional traits related to water and nutrient status, and carbon metabolism were measured. We found that water status traits (relative water content, leaf succulence, osmotic and midday water potentials) and carbon metabolism traits (carbon assimilation, maximum quantum yield of photosystem II, chlorophyll and starch contents) decreased with increasing drought stress, while leaf soluble sugars and carbon, nitrogen and phosphorus contents remained unchanged. The different leaf ontogenetic stages showed only marginal variations when subjected to a gradient of drought. Resources were not reallocated between different leaf ontogenetic stages but we found a reallocation of soluble sugars from leaf starch reserves to the root system. Both species were capable of metabolic and physiological adjustments in response to drought. Overall, this study advances our understanding of the resistance of bromeliads faced with increasing drought stress and paves the way for in-depth reflection on their strategies to cope with water shortage. © 2020 Scandinavian Plant Physiology Society  
  Address Laboratoire Ecologie Fonctionnelle et Environnement, Université de Toulouse, CNRS, Toulouse, 31062, France  
  Corporate Author (up) Thesis  
  Publisher Blackwell Publishing Ltd Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 00319317 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes PDF trop gros voir la documentaliste – merci Approved no  
  Call Number EcoFoG @ webmaster @ Serial 943  
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