title: Response of ultraviolet-B induced antioxidant defense system in a medicinal plant, Acorus calamus.
abstract: Ultraviolet-B (UV-B) radiation generates an oxidative stress in plant cells due to excessive generation of reactive oxygen species (ROS). ROS can denature enzymes and damage important cellular components. In the present study, an important medicinal plant Acorus calamus (Sweet flag) was subjected to two doses of supplemental UV-B radiation (sUV-B): sUV1 (+ 1.8 kJ m(-2) d(-1)) and sUV2 (+3.6 kJ m(-2) d(-1)) to evaluate the relative response of antioxidant defense potential. Stimulation of activities of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) was observed at initial growth period while the activities of CAT and SOD decreased at later age of sampling. sUV-B induced lipid peroxidation (LPO) was observed showing alteration of membrane properties. No definite trend of change was observed for ascorbic acid (AsA), while increments in thiol, proline, phenol and protein contents were observed due to sUV-B. Results suggested that sUV-B radiation may stimulate the enzymatic and non-enzymatic defense system of Acorus plants, showing its better adaptation at lower dose of sUV-B.
authors.affiliation: Laboratory of Air Pollution and Global Climate Change, Department of Botany, Banaras Hindu University, Varanasi--221 005, India.
authors.forename: Rima
authors.initials: R
authors.lastname: Kumari
authors.forename: Suruchi
authors.initials: S
authors.lastname: Singh
authors.forename: S B
authors.initials: SB
authors.lastname: Agrawal
mesh_terms: D029023:Acorus / Q000378:metabolism* / Q000528:radiation effects*; D000975:Antioxidants / Q000378:metabolism*; D002374:Catalase / Q000235:genetics / Q000378:metabolism; D004307:Dose-Response Relationship, Radiation; D015971:Gene Expression Regulation, Enzymologic / Q000528:radiation effects; D018506:Gene Expression Regulation, Plant / Q000528:radiation effects; D010544:Peroxidases / Q000235:genetics / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D010946:Plants, Medicinal / Q000378:metabolism* / Q000528:radiation effects*; D014466:Ultraviolet Rays
chemical_list: D000975:Antioxidants; D010940:Plant Proteins; D010544:Peroxidases; D002374:Catalase