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Publication Type J
Authors Mateos-Naranjo, E., S. Redondo-Gomez, R. Alvarez, J. Cambrolle, J. Gandullo and M. E. Figueroa
Title Synergic effect of salinity and CO2 enrichment on growth and photosynthetic responses of the invasive cordgrass Spartina densiflora
Source Journal of Experimental Botany
Author Keywords Chlorophyll fluorescence CO2 enrichment cordgrass gas exchange growth rate PEPC activity photosynthetic pigments salinity atmospheric carbon-dioxide salt-marsh phosphoenolpyruvate carboxylase elevated co2 stomatal conductance extreme halophyte aster-tripolium water relations nacl salinity global change
Abstract Spartina densiflora is a C-4 halophytic species that has proved to have a high invasive potential which derives from its clonal growth and its physiological plasticity to environmental factors, such as salinity. A greenhouse experiment was designed to investigate the synergic effect of 380 and 700 ppm CO2 at 0, 171, and 510 mM NaCl on the growth and the photosynthetic apparatus of S. densiflora by measuring chlorophyll fluorescence parameters, gas exchange and photosynthetic pigment concentrations. PEPC activity and total ash, sodium, potassium, calcium, magnesium, and zinc concentrations were determined, as well as the C/N ratio. Elevated CO2 stimulated growth of S. densiflora at 0 and 171 mM NaCl external salinity after 90 d of treatment. This growth enhancement was associated with a greater leaf area and improved leaf water relations rather than with variations in net photosynthetic rate (A). Despite the fact that stomatal conductance decreased in response to 700 ppm CO2 after 30 d of treatment, A was not affected. This response of A to elevated CO2 concentration might be explained by an enhanced PEPC carboxylation capacity. On the whole, plant nutrient concentrations declined under elevated CO2, which can be ascribed to the dilution effect caused by an increase in biomass and the higher water content found at 700 ppm CO2. Finally, CO2 and salinity had a marked overall effect on the photochemical (PSII) apparatus and the synthesis of photosynthetic pigments.
Author Address [Mateos-Naranjo, Enrique; Redondo-Gomez, Susana; Alvarez, Rosario; Cambrolle, Jesus; Gandullo, Jacinto; Enrique Figueroa, M.] Univ Seville, Fac Biol, Dept Biol Vegetal & Ecol, E-41012 Seville, Spain. Mateos-Naranjo, E, Univ Seville, Fac Biol, Dept Biol Vegetal & Ecol, Avda Reina Mercedes S-N, E-41012 Seville, Spain. emana@us.es
ISSN 0022-0957
ISBN 0022-0957
29-Character Source Abbreviation J. Exp. Bot.
Publication Date Apr
Year Published 2010
Volume 61
Issue 6
Beginning Page 1643-1654
Digital Object Identifier (DOI) 10.1093/jxb/erq029
Unique Article Identifier ISI:000276735300008
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