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한국식물학회 / v.52, no.5, 2009년, pp.417-425 
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( Examination of Antioxidative System's Responses in the Different Phases of Drought Stress and During Recovery in Desert Plant Reaumuria soongorica (Pall.) Maxim ) |
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| 초 록 |
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| The aim of this study was to test the protective roles of superoxide dismutases (SODs), guaiacol peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR) against oxidative damage and their activities in different phases of the dry down process in Reaumuria soongorica (Pall.) Maxim. leaves. Drought stress was imposed during 100 consecutive days and rewatering after 16, 72, and 100 days. The concentration of hydrogen peroxide ($H_2O_2$), malondialdehyde, and SODs activities were elevated significantly with progressing drought stress. POD and CAT activities increased markedly in the early phase of drought and decreased significantly with further drought stress continuation, and POD activity was unable to recover after rewatering. Ascorbate, reduced glutathione, APX, and GR activities declined in the initial stages of drought process, elevated significantly with further increasing water deficit progression and recovered after rewatering. These results indicate that: (1) iron SODs-removing superoxide anion is very effective during the whole drought stress; (2) CAT scavenges $H_2O_2$ in the early phase of drought and enzymes of ascorbate-glutathione cycle scavenge $H_2O_2$ in further increasing drought stress; and (3) POD does not contribute to protect against oxidative damage caused by $H_2O_2$ under drought stress. |
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| 키워드 |
| Antioxidant enzymes;Drought stress;Hydrogen peroxide;Reactive oxygen species;Reaumuria soongorica; |
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Journal of Plant Biology / v.52, no.5, 2009년, pp.417-425
한국식물학회
ISSN : 1226-9239
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200912763361249)
언어 : 영어 |
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| 논문 제공 : KISTI 한국과학기술정보연구원 |
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