Journal
NITRIC OXIDE-BIOLOGY AND CHEMISTRY
Volume 20, Issue 4, Pages 289-297Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.niox.2009.02.004
Keywords
Arsenic toxicity; Antioxidant enzymes; Nitric oxide; Oryza sativa; Oxidative stress; Reactive oxygen species; Stress amelioration
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Nitric oxide (NO) is a bioactive gaseous, multifunctional molecule playing a central role and mediating a variety of physiological processes and responses to biotic and abiotic stresses including heavy metals. The present study investigated whether NO applied exogenously as sodium nitroprusside (SNP) has any protective role against arsenic (As) toxicity in Oryza sativa (rice). Treatment with 50 mu M SNP (a NO donor) significantly ameliorated the As-induced (25 or 50 mu M) decrease in root and coleoptile length of rice. Further, As-induced oxidative stress measured in terms of malondialdehyde (MDA), superoxide ion (O-2(-center dot)), root oxidizability and H2O2 content was lesser upon supplementation of NO. It indicated a reactive oxygen species (ROS) scavenging activity of NO. NO addition reversed (only partially) the As-induced increase in activities of antioxidant enzymes - superoxide dismutase, ascorbate peroxidase, guaiacol peroxidase, and catalase. The study concludes that exogenous NO provides resistance to rice against As-toxicity and has an ameliorating effect against As-induced stress. (C) 2009 Elsevier Inc. All rights reserved.
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