Physiological responses of tagasaste to a progressive drought in its native environment on the Canary Islands |
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| Affiliation: | 1. Department of Chemical Sciences, University of Naples “Federico II”, Complesso Universitario di Monte Sant''Angelo, Via Cinthia, 21, 80126 Napoli, Italy;2. Departamento de Investigación y Posgrado en Alimentos, Facultad de Química, Universidad Autónoma de Querétaro, C.U., Cerro de la Campana s/n, Querétaro 76010, Mexico;3. Department of Food Science, College of Agriculture, Isfahan University of Technology, Isfahan 84156, Iran;1. Mediterranean Ecogeomorphological and Hydrological Connectivity Research Team (http://medhycon.uib.cat), Department of Geography, University of the Balearic Islands, Carretera de Valldemossa Km 7.5, 07122 Palma, Spain;2. Institute of Agro-Environmental and Water Economy Research –INAGEA, University of the Balearic Islands, E-07122 Palma de Mallorca, Balearic Islands, Spain;3. Service of GIS and Remote Sensing, University of the Balearic Islands, E-07122 Palma de Mallorca, Balearic Islands, Spain;4. Department of Biology, University of the Balearic Islands, E-07122 Palma de Mallorca, Balearic Islands, Spain;5. Institute of Earth and Environmental Science, University of Potsdam, Germany;6. Fluvial Dynamics Research Group, University of Lleida, Lleida, Catalonia, Spain |
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| Abstract: | Diurnal courses of gas exchange, chlorophyll fluorescence, shoot water potential (Ψ) and leaf relative water content (RWCleaf) were recorded in Chamaecytisus proliferus (L. fil.) Link ssp. proliferus var. palmensis (Christ) (tagasaste) growing in natural conditions in the North-West slope of Tenerife, Canary Islands. During the studied period (April–July 2000), the soil relative water content (RWCsoil) progressively decreased, while the air vapour pressure deficit increased. As a consequence a decrease in Ψ and RWCleaf took place as well as a decrease in stomatal conductance (gs) and CO2 assimilation rate (A). These characteristics, typical of an anisohydric plant, allowed this species to endure a mild drought.Photochemical efficiency of PSII (φPSII) followed the inverse pattern to that observed for the photosynthetic photon flux density (PPFD), decreasing at midday and recovering during the late afternoon. This recovering at the end of each day, and the constant values of the maximum quantum yield of PSII photochemistry (Fv/Fm) during the studied period, indicate that there was no permanent damage to the photosynthetic apparatus due to mild water stress. |
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