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Publication Type J
Authors Bouchenak, F., P. Henri, F. Z. Benrebiha and P. Rey
Title Differential responses to salinity of two Atriplex halimus populations in relation to organic solutes and antioxidant systems involving thiol reductases
Source Journal of Plant Physiology
Author Keywords Atriplex halimus Catalase Methionine sulphoxide reductase Peroxiredoxin Salt stress methionine-sulfoxide-reductases arabidopsis-thaliana lipid-peroxidation photooxidative stress solanum-tuberosum oxidative stress water-stress salt stress 2-cysteine peroxiredoxin quaternary ammonium
Abstract Atriplex halimus L is a xero-halophyte species widespread in the Mediterranean basin. The tolerance to water stress and high salinity of two Atriplex populations from semi-arid (Djelfa) and arid saline (Laghouat) Algerian regions has been investigated in relation with organic solutes and antioxidant systems. Whereas no noticeable difference was observed between the two populations under water stress resulting from withholding watering or PEG treatment, Laghouat plants display significantly higher fresh and dry weights than Djelfa plants when exposed to high salinity. At 300 mM NaCl, Laghouat plants exhibit higher concentrations in Na+, praline and quaternary ammonium compounds, and a higher catalase activity than Djelfa plants. We then analysed the involvement of recently characterized plastidial thiol reductases, peroxiredoxins (Prxs) and methionine sulphoxide reductases (MSRs), key enzymes scavenging organic peroxides and repairing oxidized proteins, respectively. Upon salt treatment (300 mM NaCl), we observed higher amounts of PrxQ and over-oxidized 2-Cys Prx in Laghouat than in Djelfa. An increased abundance of plastidial MSRA and a higher total MSR activity were also noticed in Laghouat plants treated with 300 mM NaCl compared to Djelfa ones. We propose that mechanisms based on organic solutes and antioxidant enzymes like catalases, peroxiredoxins and MSRs party underlie the better tolerance of the Laghouat population to high salt. (C) 2012 Elsevier GmbH. All rights reserved.
Author Address [Henri, Patricia; Rey, Pascal] CEA, DSV, Lab Ecophysiol Mol Plantes, IBEB, F-13108 St Paul Les Durance, France. [Bouchenak, Fatima; Benrebiha, Fatma-Zohra] Univ Saad Dahlab, Fac Agro Vet, Dept Agron, Lab Physiol Vegetale, Blida 09000, Algeria. [Henri, Patricia; Rey, Pascal] CNRS, UMR Biol Veget & Microbiol Environ, F-13108 St Paul Les Durance, France. [Henri, Patricia; Rey, Pascal] Aix Marseille Univ, F-13108 St Paul Les Durance, France. Rey, P (reprint author), CEA Cadarache, SBVME, Lab Ecophysiol Mol Plantes, Batiment 158, F-13108 St Paul Les Durance, France. pascal.rey@cea.fr
ISSN 0176-1617
ISBN 0176-1617
29-Character Source Abbreviation J. Plant Physiol.
Publication Date Oct
Year Published 2012
Volume 169
Issue 15
Beginning Page 1445-1453
Digital Object Identifier (DOI) 10.1016/j.jplph.2012.06.009
Unique Article Identifier WOS:000309566800002
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