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Differential Response of Scavenging of Reactive Oxygen Species in Green Gram Genotype Grown under Salinity Stress

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Author(s): Neelam Misra | Mohd. Saquib Ansari | Ajay Kumar Gupta

Journal: American Journal of Plant Physiology
ISSN 1557-4539

Volume: 1;
Issue: 1;
Start page: 41;
Date: 2006;
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Keywords: Antioxidants | antioxidant enzymes | Phaseolus aureus | salinity | salt stress

ABSTRACT
Salinity stress affects the metabolism of plant cells leading to severe crop damage and loss of yield. Oxidative stress is one of the major causes of salinity that may be responsible for the tissue damage. The present endeavor is based on the immediate responses on enzymatic and non-enzymatic to salinity-induced oxidative stress in two high yielding green gram (Phaseolus aureus) cvs. salt tolerant (T-44) and salt sensitive (SML-32). Under salinity stress, the salt tolerant cv. T-44 showed the higher activity of ROS scavenging enzyme, catalase (CAT), ascorbate peroxidase (APX), guaiacol peroxidase (GPX), Glutathione Reductase (GR), glutathione-S-transferase (GST) and enhanced levels of ascorbate (ASC) and glutathione (GSH), than the sensitive cv. SML-32. While, superoxide dismutase (SOD), monodehydroascrobate reductase (MDAR) and dehydroascorbate reductase (DHAR) were lower in cv. T-44 than cv. SML-32, it indicated lesser extent of membrane damage (lipid peroxidation) and lower levels of H2O2. The high levels of CAT activity indicate efficient scavenging of H2O2, which is produced more by non-enzymatic means than via SOD in cv. T-44. These findings suggest that planned action of enzymatic as well as non-enzymatic ROS scavenging machineries are essential to overcome the salinity-induced oxidative stress in green gram.
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