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Publication Type J
Authors Parida, A. K. and B. Jha
Title Antioxidative Defense Potential to Salinity in the Euhalophyte Salicornia brachiata
Source Journal of Plant Growth Regulation
Author Keywords Antioxidative enzymes Salicornia brachiata Lipid peroxidation Halophyte Sodium chloride salt stress lipid-peroxidation oxidative stress glutathione-reductase ascorbate peroxidase bruguiera-parviflora hydrogen-peroxide reactive oxygen water relations pea leaves
Abstract The antioxidative defense mechanism to salinity was assessed by monitoring the activities of some antioxidative enzymes and levels of antioxidants in an obligate halophyte, Salicornia brachiata, subjected to varying levels of NaCl (0, 200, 400, and 600 mM) under hydroponic culture. In the shoots of S. brachiata, salt treatment preferentially enhanced the activities of ascorbate peroxidase (APX), guaiacol peroxidase (POX), glutathione reductase (GR), and superoxide dismutase (SOD), whereas it induced the decrease of catalase (CAT) activity. Similarly, salinity caused an increase in total glutathione content (GSH + GSSG) and a decrease in total ascorbate content. Growth of S. brachiata was optimum at 200 mM NaCl and decreased with further increase in salinity. Salinity caused an increase in Na(+) content and a decrease in K(+) content of shoots. Proline levels did not change at low (0-200 mM NaCl) or moderate (400 mM NaCl) salinities, whereas a significant increase in proline level was observed at high salinity (600 mM NaCl). Accumulation of Na(+) may have a certain role in osmotic homeostasis under low and moderate salinities in S. brachiata. Parameters of oxidative stress such as malondialdehyde (MDA), a product of lipid peroxidation, and H(2)O(2) concentrations decreased at low salinity (200 mM NaCl) and increased at moderate (400 mM NaCl) and high salinities (600 mM NaCl). As a whole, our results suggest that the capacity to limit ionic and oxidative damage by the elevated levels of certain antioxidative enzymes and antioxidant molecules is important for salt tolerance of S. brachiata.
Author Address [Parida, AK; Jha, B] Cent Salt & Marine Chem Res Inst, Discipline Marine Biotechnol & Ecol, CSIR, Bhavnagar 364002, Gujarat, India Parida, AK (reprint author), Cent Salt & Marine Chem Res Inst, Discipline Marine Biotechnol & Ecol, CSIR, Gijubhai Badheka Marg, Bhavnagar 364002, Gujarat, India asishparida@csmcri.org
ISSN 0721-7595
ISBN 0721-7595
29-Character Source Abbreviation J. Plant Growth Regul.
Publication Date Jun
Year Published 2010
Volume 29
Issue 2
Beginning Page 137-148
Digital Object Identifier (DOI) 10.1007/s00344-009-9129-0
Unique Article Identifier WOS:000277939500002
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