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Publication Type J
Authors Yan, Y. Q., C. H. Pan, Y. L. Du, D. Y. Li and W. Liu
Title Exogenous salicylic acid regulates reactive oxygen species metabolism and ascorbate-glutathione cycle in Nitraria tangutorum Bobr. under salinity stress
Source Physiology and Molecular Biology of Plants
Author Keywords Ascorbate-glutathione cycle Halophyte Reactive oxygen species metabolism Salicylic acid Salinity salt stress oxidative stress nitric-oxide spinach-chloroplasts glyoxalase systems proline metabolism hydrogen-peroxide active oxygen water-stress tolerance
Abstract The effect of 0.5-1.5 mM salicylic acid (SA) on modulating reactive oxygen species metabolism and ascorbate-glutathione cycle in NaCl-stressed Nitraria tangutorum seedlings was investigated. The individual plant fresh weight (PFW) and plant dry weight (PDW) significantly increased under 100 mM NaCl while remained unchanged or decreased under 200-400 mM NaCl compared to the control. Superoxide anion (O-2(center dot-)), hydrogen peroxide (H2O2), thiobarbituric acid reactive substances (TBARS), reduced ascorbate (AsA), dehydroascorbate (DHA), reduced glutathione (GSH) and oxidized glutathione (GSSG) increased whereas the ratios of AsA/DHA and GSH/GSSG decreased under varied NaCl treatments. Ascorbate peroxidase (APX) and glutathione reductase (GR) activities were enhanced while dehydroascorbate reductase (DHAR) and monodehydroascorbate reductase (MDHAR) activities remained unvaried under 100-400 mM NaCl stresses. In addition, exogenous SA further increased PFW, PDW and root/shoot ratio. SA effectively diminished O-2(center dot-) accumulation. H2O2 and TBARS decreased under 0.5 and 1.0 mM SA treatments compared to those without SA. 0.5 mM of SA increased while 1.0 and 1.5 mM SA decreased APX activities. DHAR activities were elevated by 0.5 and 1.0 mM SA but not by 1.5 mM SA. MDHAR and GR activities kept constant or significantly increased at varying SA concentrations. Under SA treatments, AsA and GSH contents further increased, DHA and GSSG levels remained unaltered, while the decreases in AsA/DHA and GSH/GSSG ratios were inhibited. The above results demonstrated that the enhanced tolerance of N. tangutorum seedlings conferred by SA could be attributed mainly to the elevated GR and DHAR activities as well as the increased AsA/DHA and GSH/GSSG ratios.
Author Address [Yan, Yongqing; Pan, Chenhui; Du, Yuling; Li, Danyang; Liu, Wei] Northeast Agr Univ, Sch Hort & Landscape Architecture, Changjiang Rd 600, Harbin 150030, Heilongjiang, Peoples R China. Liu, W (reprint author), Northeast Agr Univ, Sch Hort & Landscape Architecture, Changjiang Rd 600, Harbin 150030, Heilongjiang, Peoples R China. weiliu@neau.edu.cn
ISSN 0971-5894
ISBN 0971-5894
29-Character Source Abbreviation Physiol. Mol. Biol. Plants
Publication Date Jul
Year Published 2018
Volume 24
Issue 4
Beginning Page 577-589
Digital Object Identifier (DOI) 10.1007/s12298-018-0540-5
Unique Article Identifier WOS:000438474000005
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