Synergic effect of salinity and light-chilling on photosystem II photochemistry of the halophyte,Sarcocornia fruticosa |
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| Authors: | S Redondo-Gómez E Mateos-Naranjo ME Figueroa |
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| Institution: | 1. Instituto Argentino de Oceanografía (IADO, CONICET, CCT-Bahía Blanca), Camino La Carrindanga km 7,5, Edificio E-1 CC 804, 8000 Bahía Blanca, Buenos Aires, Argentina;2. Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur (UNS), San Juan 670, 8000 Bahía Blanca, Buenos Aires, Argentina;3. Gekko (Grupo de Estudio en Conservación y Manejo), Universidad Nacional del Sur (UNS), San Juan 670, 8000 Bahía Blanca, Buenos Aires, Argentina;4. Universidad Tecnológica Nacional, Facultad Regional Bahía Blanca (UTN-FRBB), 11 de Abril 461, 8000 Bahía Blanca, Buenos Aires, Argentina;5. Universidad de la Fraternidad de Agrupaciones Santo Tomás de Aquino (FASTA), Gascón 3145, 7600 Mar del Plata, Buenos Aires, Argentina;1. Instituto Patagónico para el Estudio de los Ecosistemas Continentales (IPEEC-CONICET), Boulevard Brown 2915, U9120ACD Puerto Madryn, Chubut, Argentina;2. Universidad Nacional de la Patagonia San Juan Bosco, Boulevard Brown 3051, U9120ACD Puerto Madryn, Chubut, Argentina;3. Instituto Argentino de Oceanografía (IADO-CONICET), Camino La Carrindanga km 7,5-edificio E1, 8000 Bahía Blanca, Buenos Aires, Argentina |
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| Abstract: | Laboratory experiments were conduced to assess the synergic effect of chilling and light on photosystem II photochemistry of the halophyte, Sarcocornia fruticosa, grown at different salinity concentrations (0, 170, 340, 510 and 1030 mM). Chlorophyll fluorescence was measured after chilling (at 5 °C in darkness) and light-chilling (at 5 °C and 700 μmol m?2 s?1) treatments, and after 24 h of recovery (at 20 °C and 75 μmol m?2 s?1). At 5 °C and 700 μmol m?2 s?1, plants grown with 0 and 170 mM NaCl showed the lowest Fv/Fm values, whereas quantum efficiency of PSII (ΦPSII) was higher for plants grown at 170 and 340 mM NaCl, these results being consistent after two exposures to chilling treatments. Susceptibility to photoinhibition decreases when low temperature and high light are combined with high salinity. Therefore, populations of S. fruticosa that occur in arid environments with salinities c. 340 mM could show a higher tolerance to light-chilling. |
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