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Publication Type J
Authors Hafsi, C., M. C. Romero-Puertas, D. K. Gupta, L. A. del Rio, L. M. Sandalio and C. Abdelly
Title Moderate salinity enhances the antioxidative response in the halophyte Hordeum maritimum L. under potassium deficiency
Source Environmental and Experimental Botany
Author Keywords Antioxidants Hordeum maritimum L. Potassium deficiency Reactive oxygen species Salinity pisum-sativum-l. salt stress superoxide-dismutase nacl stress pea-plants glutathione-reductase lipid-peroxidation oxidative stress tolerance leaves
Abstract Changes in the leaf antioxidant metabolism upon exposure to salinity and potassium deficiency were investigated in the annual halophyte Hordeum maritimum L Plants were hydroponically grown either with a complete nutrient solution containing 3 mM K(+) without (+K/-NaCl) or with 100 mM NaCl (+K/+NaCl), or in K(+)-free medium containing 100 mM NaCl (-K/+NaCl). Malondialdehyde (MDA), carbonyl group (C=O), and hydrogen peroxide (H(2)O(2)) contents as well as antioxidant enzyme activities [superoxide dismutase (SOD; EC 1.15.1.1), catalase (CAT, EC 1.11.1.6), guaiacol peroxidase (GPX. EC 1.11.1.7), ascorbate peroxidase (APX, EC 1.11.1.11), monodehydroascorbate reductase (MDHAR, EC 1.6.5.4), dehydroascorbate reductase (DHAR, EC 1.8.5.1), and glutathione reductase (GR, EC 1.6.4.2)] and non-enzymatic antioxidant contents (ascorbate and glutathione) were determined. Plants exposed to salinity, either alone or in combination with K(+) deprivation, showed enhanced lipid peroxidation along with higher antioxidative response. This tendency was generally more marked in -K/+NaCl plants as compared to +K/+NaCl plants. H(2)O(2) concentration was negatively correlated with the plant antioxidative capacity, either enzymatic or non-enzymatic. As a whole, these data suggest that the enhancement of the antioxidative response is of crucial significance for H. maritimum plants growing under salinity and potassium deficiency. (C) 2010 Elsevier B.V. All rights reserved.
Author Address [Hafsi, C; Abdelly, C] Ctr Biotechnol Technopole Borj Cedria, Lab Adaptat Plantes Stress Abiot, Hammam Lif 2050, Tunisia [Romero-Puertas, MC; Gupta, DK; del Rio, LA; Sandalio, LM] CSIC, Estn Expt Zaidin, Dept Bioquim Biol Celular & Mol Plantas, E-18080 Granada, Spain Hafsi, C (reprint author), Ctr Biotechnol Technopole Borj Cedria, Lab Adaptat Plantes Stress Abiot, BP 901, Hammam Lif 2050, Tunisia hafsichokri@yahoo.fr
ISSN 0098-8472
ISBN 0098-8472
29-Character Source Abbreviation Environ. Exp. Bot.
Publication Date Nov
Year Published 2010
Volume 69
Issue 2
Beginning Page 129-136
Digital Object Identifier (DOI) 10.1016/j.envexpbot.2010.04.008
Unique Article Identifier WOS:000278884100006
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