Journal
JOURNAL OF PLANT BIOLOGY
Volume 52, Issue 2, Pages 135-140Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s12374-009-9013-2
Keywords
Nitric oxide; Oxidative damage; Ultraviolet-B
Categories
Funding
- National Key Basic Research Special Funds of China [2006CB100101]
- Key Natural Science Foundation of Hebei Normal University [L2007Z08]
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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 nitroprusside, 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 - l - 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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