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Response of antioxidant defense system to laser radiation apical meristem of Isatis indigotica seedlings exposed to UV-B

Author:
Chen, Yi-Ping
Source:
Plant signaling & behavior 2009 v.4 no.7 pp. 571-573
ISSN:
1559-2324
Subject:
Isatis tinctoria, antioxidant activity, apical meristems, catalase, enzyme activity, free radicals, irradiation, peroxidase, photosynthetically active radiation, proline, seedlings, superoxide dismutase, ultraviolet radiation
Abstract:
To determine the response of antioxidant defense system to laser radiation apical meristem of Isatis indigotica seedlings, Isatis indigotica seedlings were subjected to UV-B radiation (10.08 kJ m⁻²) for 8 h day-1 for 8 days (PAR, 220 µmol m⁻² s⁻¹) and then exposed to He-Ne laser radiation (633 nm; 5.23 mW mm⁻²; beam diameter: 1.5 mm) for 5 min each day without ambient light radiation. Changes in free radical elimination systems were measured, the results indicate that: (1) UV-B radiation enhanced the concentration of Malondialdahyde (MDA) and decreased the activities of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) in seedlings compared with the control. The concentration of MDA was decreased and the activities of SOD, CAT and POD were increased when seedlings were subjected to elevated UV-B damage followed by laser; (2) the concentration of UV absorbing compounds and proline were increased progressively with UV-B irradiation, laser irradiation and He-Ne laser irradiation plus UV-B irradiation compared with the control. These results suggest that laser radiation has an active function in repairing UV-B-induced lesions in seedlings.
Agid:
6903930