Monday, November 5, 2007
63-12

Antioxidant Enzyme Activities and Lipid Peroxidation at Early Growth Stage Under Hypoxic Water in Rice (Oryza sativa L).

Ji-Young Shon, Jong-Cheol Ko, Bo-Kyeong Kim, Hyeon-Jung Kang, Ki-Young Kim, Man-Kee Baek, and Chung-Kon Kim. Rice Breeding and Cultivation Division, HARI, National Institute of Crop Science, RDA, Osan-Ro 67, Iksan, JeonBuk, South Korea

Direct seeding rice cultivar requires strong hypoxia tolerance for stable seedling establishment on flooded paddy field. This study investigates that the genotypic difference of antioxidant enzymes activity and level of lipid peroxidation at early seedling growth under hypoxia for two japonica rice cultivars; Iksan429 and Woodrose. The seedling longevity was longer in Iksan429 than Woodrose under hypoxic water, although the elongation of shoot of Woodrose was faster than that of Iksan429 up to  7days. The activities of superoxide dismutase(SOD; EC 1.15.1.1) and peroxidase(POX; EC 1.11.1.7) were higher in Iksan429 than Woodrose under hypoxia. But there was no genotypic difference in the activity of catalase (CAT; EC 1.11.1.6) between Iksan429 and Woodrose under hypoxia. The levels of lipid peroxidation, which was prevented by antioxidant enzymes, measured as thiobarbituric acid reactive substance(TBARS) was higher in Woodrose than Iksan429. These results suggest that antioxidant enzyme activities of SOD and POX were responsible for the longevity of rice seedlings under hypoxic water.

Back to Physiological Responses to Irrigation, Drought, Salinity, Cold, and Hypoxia
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Back to The ASA-CSSA-SSSA International Annual Meetings (November 4-8, 2007)