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한국식물학회 / v.49, no.6, 2006년, pp.440-447 
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( Differential Antioxidative Responses of Ascorbate-Glutathione Cycle Enzymes and Metabolites to Chromium Stress in Green Gram (Vigna radiata L. Wilczek) Leaves ) |
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| 초 록 |
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| Chromium-induced antioxidative responses of ascorbate-glutathione cycle enzymes and metabolites in green gram (Vigna radiata L. Wilczek) leaves were investigated in both dose and time-dependent manners. Rapid uptake of Cr was observed immediately after the start of treatment. Significant reduction was observed in leaf biomass under $300{mu}M$ Cr-treatment. Treatment with $300{mu}M$ Cr increases the content of hydrogen peroxide and superoxide dismutase activity upto initial 96 h, and then gradually declined to the basal level. Ascorbate peroxidase and guaiacol peroxidase activities were low in $300{mu}M$ Cr-treated leaves during the first 96 h, but significantly increased therefore, suggesting that increased enzyme activities would be responsible for the removal of $H_2O_2$. Catalase activities were always suppressed under Cr stress. Contents of reduced ascorbate and dehydroascorbate were significantly decreased under $300{mu}M$ Cr-treatment. The reduced glutathione content decreased at early stages of Cr-treatment. However, it was restored to the normal level as in controls thereafter. In contrast, the glutathione disulphide content showed a progressive increase during the initial hours of Cr-treatment. The non-protein thiol content was shown to increase during the first several hours, but it declines at later stages. The present results demonstrate that Cr-induced oxidative stress is an important component of the plant's reaction to toxic levels of Cr. |
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| 키워드 |
| antioxidative systems;Cr toxicity;green gram;non-protein thiol;reactive oxygen species; |
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Journal of Plant Biology / v.49, no.6, 2006년, pp.440-447
한국식물학회
ISSN : 1226-9239
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200606141787276)
언어 : 영어 |
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| 논문 제공 : KISTI 한국과학기술정보연구원 |
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