Effect of NaCl Stress on Antioxidant Metabolism in Black Gram (Vigna mungo L.) Seedlings

Author(s): Sunanda Ch, Bindu Prasuna A and Ranganayakulu G.S*

Abstract: The effects of salt stress on seedling growth (percent seedling survival rate, shoot and root length) and the activity of antioxidative enzymes were investigated in two important black gram cultivars (Maruthi and LBG-752) during salt stress period. Seeds were grown at different concentrations of NaCl stress [(0.0 (control), 50, 100 and 150mM] for six days. Salt stress resulted reduced seedling growth in both cultivars. Nevertheless, the rate of decrease in seedling growth (percent seedling survival rate, shoot and root length) was significantly more in cultivar LBG-752 than cultivar Maruthi. Salt stress resulted a gradually significant increase in superoxide dismutase (SOD: EC 1.15.1.1), peroxidase (POX: 1.11.1.7), catalase (CAT: 1.11.1.6) and glutathione reductase (GR: EC 1.6.4.2) activities in both cultivars with increase in stress levels. However, a significant increase in superoxide dismutase (SOD: EC 1.15.1.1), peroxidase (POX: 1.11.1.7), catalase (CAT: 1.11.1.6) and glutathione reductase (GR: EC 1.6.4.2) enzyme activities in both cultivars with increase in stress levels. These results possibly suggest that the cultivar Maruthi showed a better protection mechanism against oxidative damage by maintaining higher constitutive and induced activities of antioxidant enzymes than the cultivar LBG-752.

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