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Z. Naturforsch. 69c, 226 – 236 (2014)
doi:10.5560/ZNC.2013-0117
Exogenous Ascorbic Acid and Glutathione Alleviate Oxidative Stress Induced by Salt Stress in the Chloroplasts of Oryza sativa L.
Renlei Wang1, Shaohua Liu1, Feng Zhou2, Chunxia Ding2, and Chun Hua2,*
1 School of Life Sciences and Chemistry, Jiangsu Institute of Education, Nanjing 210013, P. R. China
2 School of Biochemical and Environmental Engineering, Nanjing Xiaozhuang University, Nanjing 211171, P. R. China. Fax: +86-25-86178148. E-mail: njulsh@126.com
*Author for correspondence and reprint requests
Received July 9, 2013 / February 2, 2014 / published online June 5, 2014
The effects of exogenous ascorbic acid (AsA) and reduced glutathione (GSH) on antioxidant enzyme activities [superoxide dismutase (SOD), ascorbate peroxidase (APX), and glutathione reductase (GR)] and the contents of malondialdehyde (MDA) and H2O2, as well as of endogenous AsA and GSH, in the chloroplasts of two rice cultivars, the salt-tolerant cultivar Pokkali and the salt-sensitive cultivar Peta, were investigated. Exogenous AsA and GSH enhanced SOD, APX, and GR activities, increased endogenous AsA and GSH contents, and reduced those of H2O2 and MDA in the chloroplasts of both cultivars under salt stress (200 mm NaCl), but the effects were significantly more pronounced in cv. Pokkali. GSH acted more strongly than AsA on the plastidial reactive oxygen scavenging systems. These results indicated that exogenous AsA and GSH differentially enhanced salinity tolerance and alleviated salinity-induced damage in the two rice cultivars.
Key words: Oryza sativa L., Oxidative Stress, Salt Stress
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