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Publication Type J
Authors Mateos-Naranjo, E., S. Redondo-Gomez, L. Andrades-Moreno and A. J. Davy
Title Growth and photosynthetic responses of the cordgrass Spartina maritima to CO2 enrichment and salinity
Source Chemosphere
Author Keywords CO2 enrichment Salinity Chlorophyll fluorescence Relative growth rate Photosystem II Spartina maritima elevated atmospheric co2 salt-marsh stomatal conductance extreme halophyte aster-tripolium
Abstract Future climatic scenarios combine increasing concentrations of atmospheric CO2 and rising sea levels. Spartina maritima is a C-4 halophyte that is an important pioneer and ecosystem engineer in salt marshes of the Atlantic coast of southern Europe. A glasshouse experiment investigated the combined effects on its growth and photosynthetic apparatus of approximately doubling CO2 concentration (from 380 to 700 mu mol mol(-1)) at a range of salinity (0, 171 and 510 mM NaCl). We measured relative growth rates, gas exchange, chlorophyll fluorescence parameters, photosynthetic pigment concentrations, and total ash, Na+, K2+, Ca2+ and N concentrations. Elevated CO2 stimulated growth of S. maritima by c. 65% at all external salinities; this growth enhancement was associated with greater net photosynthetic rate (A) and improved leaf water relations. A increased despite a drop in stomatal conductance in response to 700 mu mol mol(-1) CO2. CO2 and salinity had a marked overall effect on the photochemical (PSII) apparatus and the synthesis of photosynthetic pigments. Phi(PSII) values at midday decreased significantly with external salinity in plants grown at 380 mu mol mol(-1) CO2; and F-v/F-m and Phi(PSII) values were higher at 700 mu mol mol(-1) CO2 in presence of NaCl. Plant nutrient concentrations declined under elevated CO2, which can be ascribed to the dilution effect caused by an increase in biomass. The results suggest that the productivity S. maritima and the ecosystem services it provides will increase in likely future climatic scenarios. (c) 2010 Elsevier Ltd. All rights reserved.
Author Address [Mateos-Naranjo, E.; Redondo-Gomez, S.; Andrades-Moreno, L.] Univ Seville, Dept Biol Vegetal & Ecol, Fac Biol, E-41080 Seville, Spain. [Davy, A. J.] Univ E Anglia, Ctr Ecol Evolut & Conservat, Sch Biol Sci, Norwich NR4 7TJ, Norfolk, England. Mateos-Naranjo, E, Univ Seville, Dpto Biol Vegetal & Ecol, Fac Biol, Avda Reina Mercedes S-N, E-41012 Seville, Spain. emana@us.es
ISSN 0045-6535
ISBN 0045-6535
29-Character Source Abbreviation Chemosphere
Publication Date Oct
Year Published 2010
Volume 81
Issue 6
Beginning Page 725-731
Digital Object Identifier (DOI) 10.1016/j.chemosphere.2010.07.047
Unique Article Identifier ISI:000283700500007
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