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Publication Type J
Authors Hafsi, C., M. C. Romero-Puertas, L. del Rio, C. Abdelly and L. M. Sandalio
Title Antioxidative response of Hordeum maritimum L. to potassium deficiency
Source Acta Physiologiae Plantarum
Author Keywords Antioxidants Growth Hordeum maritimum L. Potassium deficiency Reactive oxygen species ascorbate-glutathione cycle oxidative stress superoxide-dismutase arabidopsis-thaliana magnesium-deficiency hydrogen-peroxide pisum-sativum sodium uptake salt stress pea-plants
Abstract The objective of the present study was to determine the influence of potassium deprivation on the halophyte species Hordeum maritimum grown in hydroponics for 2 weeks. Treatments were with potassium (+K) or without potassium (-K). Growth, water status, mineral nutrition, parameters of oxidative stress [malondialdehyde (MDA), carbonyl groups (C=O), and hydrogen peroxide concentration (H(2)O(2)) contents], 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 peroxidase (MDHAR, EC 1.6.5.4), dehydroascorbate peroxidase (DHAR, EC 1.8.5.1), and glutathione reductase (GR, EC 1.6.4.2)], and antioxidant molecules [ascorbate (ASC), and glutathione (GSH)] were determined. Results showed that the growth of vegetative organs decreased owing to potassium deficiency with roots (-36%) more affected than shoots (-12%). Water status was only diminished in roots (reduction of 24%). Potassium deprivation decreased potassium concentration in both organs, this decrease was more pronounced in roots (-81%) than in shoots (-55%). In contrast to carbonyl groups, MDA content increased owing to potassium deprivation. Except for CAT activity that remained unaffected; SOD, GPX, APX, GR, MDHAR, and DHAR activities were significantly increased. H(2)O(2) concentration was negatively correlated with the activities of enzymes and the accumulation of non-enzymatic antioxidants implicated in its detoxification. In conclusion, a cooperative process between the antioxidant systems is important for the tolerance of H. maritimum to potassium deficiency.
Author Address [Hafsi, C; Abdelly, C] Ctr Biotechnol, Lab Adaptat Plantes Stress Abiot, Hammam Lif 2050, Tunisia [Romero-Puertas, MC; del Rio, L; Sandalio, LM] CSIC, Estac Expt Zaidin, Dept Bioquim Biol Celular & Mol Plantas, E-18080 Granada, Spain Hafsi, C (reprint author), Ctr Biotechnol, Lab Adaptat Plantes Stress Abiot, Technopole Borj Cedria,BP 901, Hammam Lif 2050, Tunisia hafsichokri@yahoo.fr
ISSN 0137-5881
ISBN 0137-5881
29-Character Source Abbreviation Acta Physiol. Plant.
Publication Date Jan
Year Published 2011
Volume 33
Issue 1
Beginning Page 193-202
Digital Object Identifier (DOI) 10.1007/s11738-010-0537-3
Unique Article Identifier WOS:000285997900018
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