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KMID : 1024519980070050633
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Journal of the Environmental Sciences
1998 Volume.7 No. 5 p.633 ~ p.638
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Effects of Antioxidants on UV-B Susceptibility in Soybean
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Kim Hak-Yoon
Park Yi-Sang
Lee In-Jung
Shin Dong-Hyun
Kim Kil-Ung
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Abstract
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To determine whether the enhanced UV-B causes oxidative stress, and to test the relationship between plant growth response and biochemical defense response to UV-B, two soybean plants, Keunolkong, a highly UV-B susceptible cultivar, and Danyeubkong, a less UV-B susceptible cultivar, were subjected to the enhanced UV-B [daily dose : 0.06 (control) and 11.32 (enhanced UV-B) kJ ; ] for 3 weeks. Contents of malondialdehyde and total carotenold were increased in Keunolkong compared with Danyeubkong by UV-B. In control plants, ascorbate level of Danyeubkong was 3 times higher than that of Keunolkong. The ratio of dehydroascorbate/ascorbate was highly increased in Keunolkong by UV-B . The activities of antioxidative enzyme such as superoxide dismutase, ascorbate peroxidase, monodehydroascorbate reductase and glutathione reductase were increased in both cultivars by UV-B. This results indicate that enhanced UV-B caused oxidative stress in both two cultivars, especially in Keunolkong. Susceptibility of two soybean cultivars to UV-B is closely related to the levels of antioxidants such as carotenoid and ascorbate.
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KEYWORD
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antioxidants, antioxidative enzymes, malondialdehyde, UV-B, soybean
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