Nitric oxide modulates antioxidant defense and the methylglyoxal detoxification system and reduces salinity-induced damage of wheat seedlings

• Published in: Plant biotechnology reports Vol. 5; no. 4; pp. 353 - 365
• Main Authors: Hasanuzzaman, Mirza, Hossain, Mohammad Anwar, Fujita, Masayuki
• Format: Journal Article
• Language: English
• Published: Japan Springer-Verlag 01-10-2011; Springer Japan; Springer Nature B.V; 한국식물생명공학회
• Subjects: Abiotic stress; Acids; Agricultural biotechnology; Agriculture; Antioxidants; ascorbate peroxidase; Biomedical and Life Sciences; Biotechnology; Cell Biology; Detoxification; Enzymes; Gene expression; glutathione dehydrogenase (ascorbate); glutathione peroxidase; glutathione transferase; glutathione-disulfide reductase; Homeostasis; Hydrogen peroxide; Investigations; Kinases; Life Sciences; Lipid peroxidation; Metabolism; monodehydroascorbate reductase (NADH); Nitric oxide; nitroprusside; Original Article; Oxidative stress; Peroxidation; Physiology; Plant Biochemistry; Plant Sciences; Salinity; Salt; salt stress; Salts; Seedlings; Sodium; Sodium chloride; Stress; Stress response; Studies; synergism; Synergistic effect; Vitamin E; Wheat; 농학; Asia; Sodium nitroprusside; Reactive oxygen species; Salt stress; Ascorbate–glutathione cycle; Glyoxalase system; Antioxidant defense
• ISSN: 1863-5466; 1863-5474
• DOI: 10.1007/s11816-011-0189-9

The present study investigates the possible regulatory role of exogenous nitric oxide (NO) in antioxidant defense and methylglyoxal (MG) detoxification systems of wheat seedlings exposed to salt stress (150 and 300 mM NaCl, 4 days). Seedlings were pre-treated for 24 h with 1 mM sodium nitroprusside, a NO donor, and then subjected to salt stress. The ascorbate (AsA) content decreased significantly with increased salt stress. The amount of reduced glutathione (GSH) and glutathione disulfide (GSSG) and the GSH/GSSG ratio increased with an increase in the level of salt stress. The glutathione S-transferase (GST) activity increased significantly with severe salt stress (300 mM). The ascorbate peroxidase (APX), monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), catalase (CAT) and glutathione peroxidase (GPX) activities did not show significant changes in response to salt stress. The glutathione reductase (GR), glyoxalase I (Gly I), and glyoxalase II (Gly II) activities decreased upon the imposition of salt stress, especially at 300 mM NaCl, with a concomitant increase in the H2O2 and lipid peroxidation levels. Exogenous NO pre-treatment of the seedlings had little influence on the non-enzymatic and enzymatic components compared to the seedlings of the untreated control. Further investigation revealed that NO pre-treatment had a synergistic effect; that is, the pre-treatment increased the AsA and GSH content and the GSH/GSSG ratio, as well as the activities of MDHAR, DHAR, GR, GST, GPX, Gly I, and Gly II in most of the seedlings subjected to salt stress. These results suggest that the exogenous application of NO rendered the plants more tolerant to salinity-induced oxidative damage by enhancing their antioxidant defense and MG detoxification systems.