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한국식물학회 / v.52, no.2, 2009년, pp.135-140 
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( Protective Effect of Nitric Oxide against Oxidative Damage in Arabidopsis Leaves under Ultraviolet-B Irradiation ) |
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| 초 록 |
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| Nitric oxide (NO) is a key molecule involved in many physiological processes. To characterize its roles in the tolerance of Arabidopsis thaliana to ultraviolet-B (UV-B), we investigated the effect of a reduced endogenous NO level on oxidative damage to wild-type and mutant (Atnoa1) plants. Under irradiation, hydrogen peroxide was accumulated more in mutant leaves than in the wild type. However, the amounts of UV-B-absorbing compounds (flavonoids and anthocyanin) and the activities of two antioxidant enzymes-catalase (CAT, EC 1.11.1.6) and ascorbate peroxidase (APX, EC 1.11.1.11)-were lower in leaves of the former. Supplementing with sodium nitro-prusside, an NO donor, could alleviate the oxidative damage to mutant leaves by increasing flavonoid and anthocyanin contents and enzyme activities. In comparison, $N^{omega}-nitro-{iota}-arginine$, an inhibitor of nitric oxide synthase, had the opposite effects on oxidation resistance in wild-type leaves. All these results suggest that nitric oxide acts as a signal for an active oxygen-scavenging system that protects plants from oxidative stress induced by UV-B irradiation. |
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| 키워드 |
| Nitric oxide;Oxidative damage;Ultraviolet-B; |
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Journal of Plant Biology / v.52, no.2, 2009년, pp.135-140
한국식물학회
ISSN : 1226-9239
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200917639073476)
언어 : 영어 |
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| 논문 제공 : KISTI 한국과학기술정보연구원 |
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