Loading content, please wait..
Version 3.24
Publication Type J
Authors Canalejo, A., D. Martinez-Dominguez, F. Cordoba and R. Torronteras
Title Salt tolerance is related to a specific antioxidant response in the halophyte cordgrass, Spartina densiflora
Source Estuarine Coastal and Shelf Science
Author Keywords antioxidant response halophyte oxidative stress salinity salt marshes Spartina nacl stress lycopersicon-pennellii lipid-peroxidation oxidative stress suaeda-salsa cultivated tomato salinity stress sw spain systems leaves
Abstract Halophytes usually have a robust antioxidative defense system to alleviate oxidative damage during salt stress. Spartina densiflora is a colonizing halophyte cordgrass, native of South America, which has become a common species in salt marshes of northern hemisphere, where it is ousting indigenous species. This study addressed salinity stress in S. densiflora; the occurrence of oxidative stress and the possible involvement of the antioxidative system in its high salt tolerance were studied. Plants were evaluated at in situ conditions, in the laboratory during a 28 day-acclimation period (AP) in clean substrate irrigated with a control salt content of 4 g L-1 (68 mM) and during a subsequent 28 day-treatment period (TP) exposed to different NaCl concentrations: control (68 mM), 428 mM or 680 mM. In the in situ setting, the high leave Na+ content was accompanied by high levels of hydroperoxides and reduced levels of total chlorophyll and carotenes, which correlated with enhanced activation of antioxidant defense biomarkers as total ascorbic acid (AA) content and guaiacol peroxidase (POD: EC, catalase (CAT: EC and ascorbate peroxidase (APX: EC activities. Throughout the AP, leave Na+ and oxidative stress markers decreased concomitantly and reached stable low levels. During the TP, dose and time-dependent accumulation of Na+ in high NaCl-treated plants was concurrent with a decrease in content of total chlorophyll and carotenes and with an increase in the levels of total AA and CAT and APX activities. In conclusion, as hypothesized, high salinity induces conditions of oxidative stress in S. densiflora, so that its salt tolerance appears to be related to the implementation of a specific antioxidant response. This may account for Spartina densiflora's successful adaptation to habitats with fluctuating salinity and favour its phytoremediation potential. (C) 2014 Elsevier Ltd. All rights reserved.
Author Address [Canalejo, Antonio; Martinez-Dominguez, David; Cordoba, Francisco; Torronteras, Rafael] Univ Huelva, Fac Expt Sci, Dept Environm Biol & Publ Hlth, ES-21071 Huelva, Spain. Canalejo, A (reprint author), Univ Huelva, Fac Expt Sci, Dept Environm Biol & Publ Hlth, Marine Int Campus Excellence CEIMAR, ES-21071 Huelva, Spain. antonio.canalejo.dbasp@uhu.es
ISSN 0272-7714
ISBN 0272-7714
29-Character Source Abbreviation Estuar. Coast. Shelf Sci.
Publication Date Jun
Year Published 2014
Volume 146
Beginning Page 68-75
Digital Object Identifier (DOI) 10.1016/j.ecss.2014.05.017
Unique Article Identifier WOS:000340983900008
Plants associated with this reference

LEGAL NOTICES — This website is protected by Copyright © The University of Sussex, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022. The eHALOPH database is protected by Database Right and Copyright © The University of Sussex and other contributors, 2006, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022. This database is based on an earlier work by James Aronson.

Contact email: halophytes@sussex.ac.uk
Credits – Tim Flowers, Joaquim Santos, Moritz Jahns, Brian Warburton, Peter Reed