Enhanced Antioxidant Enzymes Are Associated with Reduced Hydrogen Peroxide in Barley Roots under Saline Stress
2005
Kim, S.Y. (Chonbuk National University, Chonju, Republic of Korea) | Kim, Y.J. (Honam Agricultural Research Institute, NICS, Iksan, Republic of Korea) | Seo, Y.W. (Korea University, Seoul, Republic of Korea) | Lim, J.H. (Chonbuk National University, Chonju, Republic of Korea) | Park, M.R. (Chonbuk National University, Chonju, Republic of Korea) | Choi, K.G. (Chonbuk National University, Chonju, Republic of Korea) | Yun, S.J. (Chonbuk National University, Chonju, Republic of Korea), E-mail: [email protected] | Park, T.I. (Honam Agricultural Research Institute, NICS, Iksan, Republic of Korea)
Antioxidant enzymes are related to the resistance to various abiotic stresses including salinity. Barley is relatively tolerant to saline stress among crop plants, but little information is available on barley antioxidant enzymes under salinity stress. We investigated temporal and spatial responses of activities and isoform profiles of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), non-specific peroxidase (POX), and glutathione reductase (GR) to saline stress in barley seedlings treated with 200 mM NaCl for 0, 1, 2, 5 days, respectively. In the control plant, hydrogen peroxide content was about 2-fold higher in the root than in the shoot. Under saline stress, hydrogen peroxide content was decreased drastically by 70% at 2 d after NaCl treatment (DAT) in the root.
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