title: Effect of sodium nitroprusside and S-nitrosoglutathione on pigment content and antioxidant system of tocopherol-deficient plants of Arabidopsis thaliana.
abstract: Sodium nitroprusside (SNP) and S-nitrosoglutathione (GSNO) were used as a source of exogenous nitric oxide (NO) to investigate their effects on biochemical parameters and antioxidant enzyme response in leaves of wild type Columbia and tocopherol-deficient vte4 and vte1 mutant lines of Arabidopsis thaliana plants and possible tocopherol involvement in regulation of antioxidant response under NO-induced stress. SNP enhanced the activity of the enzymes, that scavenge hydrogen peroxide in leaves of all studied lines, and increased glutathione reductase and glutathione-S-transferase activity there. In addition, it decreased the intensity of lipid peroxidation in vte1 mutant line leaves. At the same time, GSNO increased the levels of protein carbonyls and inactivated enzymes ascorbate peroxidase, guaiacol peroxidase and dehydroascorbate reductase in almost all investigated plant lines. In contrast to wild type, GSNO increased superoxide dismutase activity and decreased catalase activity and chlorophyll a/b ratio in the leaves of two mutant lines. It can be assumed that tocopherols in some way are responsible for plant protection against NO-induced stress. However the mechanisms of this protection remain unknown.
authors.affiliation: Vassyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine.
authors.forename: N M
authors.initials: NM
authors.lastname: Semchuk
authors.forename: Iu V
authors.initials: IuV
authors.lastname: Vasylyk
authors.forename: O I
authors.initials: OI
authors.lastname: Kubrak
authors.forename: V I
authors.initials: VI
authors.lastname: Lushchak
mesh_terms: D000222:Adaptation, Physiological; D000975:Antioxidants / Q000378:metabolism; D017360:Arabidopsis / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism*; D060387:Ascorbate Peroxidases / Q000378:metabolism; D002374:Catalase / Q000378:metabolism; D002734:Chlorophyll / Q000096:biosynthesis; D000077194:Chlorophyll A; D016166:Free Radical Scavengers / Q000378:metabolism; D014644:Genetic Variation; D005980:Glutathione Reductase / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000378:metabolism; D015227:Lipid Peroxidation; D009569:Nitric Oxide / Q000378:metabolism; D009599:Nitroprusside / Q000494:pharmacology*; D018384:Oxidative Stress / Q000502:physiology; D010088:Oxidoreductases / Q000378:metabolism; D009195:Peroxidase / Q000378:metabolism; D010860:Pigments, Biological / Q000378:metabolism*; D018515:Plant Leaves / Q000378:metabolism; D026422:S-Nitrosoglutathione / Q000494:pharmacology*; D013482:Superoxide Dismutase / Q000378:metabolism; D024505:Tocopherols / Q000378:metabolism*
chemical_list: D000975:Antioxidants; D016166:Free Radical Scavengers; D010860:Pigments, Biological; D002734:Chlorophyll; D009599:Nitroprusside; D009569:Nitric Oxide; D026422:S-Nitrosoglutathione; D006861:Hydrogen Peroxide; D010088:Oxidoreductases; C121048:guaiacol peroxidase; D060387:Ascorbate Peroxidases; D002374:Catalase; D009195:Peroxidase; D013482:Superoxide Dismutase; D005980:Glutathione Reductase; C020666:glutathione dehydrogenase (ascorbate); D024505:Tocopherols; D000077194:Chlorophyll A