Indian Journal of Plant Physiology

  • Year: 2010
  • Volume: 15
  • Issue: 2

Biochemical impact of re-oxygenation in rice seedlings after submergence stress

  • Author:
  • R.K. Upadhyay1,, S.K. Panda1, B.K. Dutta2
  • Total Page Count: 5
  • DOI:
  • Page Number: 148 to 152

1Plant Biochemistry and Molecular Biology Laboratory, School of Life Sciences, Assam Central University, Silchar-788 011, India.

2Agricultural Ecology Laboratory, School of Environmental Sciences, Assam Central University, Silchar-788 011, India.

Abstract

Rice cultivars treated with 2, 4 and 6d of submergence and post submergence exhibited increase in reactive oxygen species, hydrogen peroxide (H2O2) and superoxide radical (O2−.). The analysis of lipid peroxidation showed high increment in malondialdehyde (MDA) production only after 2d of treatment. Significant increase in peroxidase (POX) and superoxide dismutase (SOD) activities were enhanced under post submergence treatment after 4d, but reduced after 6d while catalase (CAT) activity declined after 4d of treatment. The contents of ascorbate (AsA) and glutathione (GSH) also showed increasing trends. The objective of this experiment was to test the hypothesis that submergence induces oxidative stress with exposure dependent intensity and variability and activates defence system in Oryza sativa L. Though water is essential for plants, but submergence-associated O2 alteration causes the toxicity.

Keywords

Oxidative stress, Oryza sativa, re-aeration, submergence