Assessment of Antioxidant Defense System in Transplanted Rice Varieties (in Catalase and Nitrate Reductase)

Rita Tiwari, S. P. Singh

Abstract: Water loss in rice (Oryza sativa L. ) can induce production of highly reactive molecules such as hydrogen peroxide (H2O2) and hydroxyl radicals (OH), singlet oxygen which all are named reactive oxygen species (ROS). ROS are regarded as main source of damage to cell of abiotic stress, which particularly synthesized in Chloroplast and Mitochondria salt tolerant varieties (Usar Dhan-3 and CSR-23 and salt susceptible varieties IR-42 and CSR-28) showed good result in stress condition increased or decreased under sodic condition in all salt tolerant varieties.

Keywords: Antioxidants, Oryza sativa L, reactive oxygen species ROS