title: Responses of antioxidant potentials in Dioscorea rotundata Poir. following paclobutrazol drenching.
abstract: The effect of paclobutrazol (PBZ) treatments on the antioxidant metabolism of white yam (Dioscorea rotundata Poir.) was investigated in the present study. PBZ @ 15 mg l(-1) plant(-1) was given to plants by soil drenching, 30, 60, and 90 days after planting (DAP). The non-enzymatic antioxidant contents like ascorbic acid (AA), reduced glutathione (GSH) and alpha-tocopherol (alpha-toc), activities of antioxidant enzymes like superoxide dismutase (SOD), ascorbate peroxidase (APX), polyphenol oxidase (PPO) and catalase (CAT) were extracted and assayed on 100 DAP from leaf, stem and tubers of both control and PBZ treated plants. It was found that PBZ has a profound effect on the antioxidant metabolism and caused an enhancement in both non-enzymatic and enzymatic antioxidant potentials under treatments in white yam. Our results have good significance, as this increase the innate antioxidant potential of this food crop, which is helpful to satisfy the needs of antioxidants in diet and thereby make it an economically important food crop.
authors.affiliation: Stress Physiology Lab, Department of Botany, Annamalai University, Annamalainagar 608 002, Tamil Nadu, India. abdul79jaleel@rediffmail.com
authors.forename: Cheruth Abdul
authors.initials: CA
authors.lastname: Jaleel
authors.forename: Paramasivam
authors.initials: P
authors.lastname: Manivannan
authors.forename: Muthiah
authors.initials: M
authors.lastname: Gomathinayagam
authors.forename: Ramalingam
authors.initials: R
authors.lastname: Sridharan
authors.forename: Rajaram
authors.initials: R
authors.lastname: Panneerselvam
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D060387:Ascorbate Peroxidases; D001205:Ascorbic Acid / Q000378:metabolism; D002374:Catalase / Q000378:metabolism; D004156:Catechol Oxidase / Q000378:metabolism; D027742:Dioscorea / Q000187:drug effects / Q000502:physiology*; D005978:Glutathione / Q000378:metabolism; D010544:Peroxidases / Q000378:metabolism; D018515:Plant Leaves / Q000378:metabolism; D018517:Plant Roots / Q000187:drug effects / Q000502:physiology; D018547:Plant Stems / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism; D014230:Triazoles / Q000494:pharmacology*; D024502:alpha-Tocopherol / Q000378:metabolism
chemical_list: D000975:Antioxidants; D014230:Triazoles; C053370:paclobutrazol; D004156:Catechol Oxidase; D010544:Peroxidases; D060387:Ascorbate Peroxidases; D002374:Catalase; D013482:Superoxide Dismutase; D005978:Glutathione; D024502:alpha-Tocopherol; D001205:Ascorbic Acid