title: How the redox state of tobacco 'Bel-W3' is modified in response to ozone and other environmental factors in a sub-tropical area?
abstract: This study intended to determine whether the redox state in plants of Nicotiana tabacum 'Bel-W3' fluctuates in response to the environmental factors in a sub-tropical area contaminated by ozone (São Paulo, SE-Brazil) and which environmental factors are related to this fluctuation, discussing their biomonitoring efficiency. We comparatively evaluated the indicators of redox state (ascorbic acid, glutathione, superoxide dismutase, ascorbate peroxidase, and glutathione reductase) and leaf injury in 17 field experiments performed in 2008. The redox state was explained by the combined effects of chronic levels of O(3) and meteorological variables 4-6 days prior to the plant sampling. Moderate leaf injury was observed in most cases. The redox state of tobacco decreases few days after their placement in the sub-tropical environment, causing them to become susceptible to oxidative stress imposed by chronic doses of O(3). Its bioindicator efficiency would not be diminished in such levels of atmospheric contamination.
authors.affiliation: Instituto de Botânica, Caixa Postal 3005, 01061-970 São Paulo, SP, Brazil.
authors.forename: Ana P L
authors.initials: AP
authors.lastname: Dias
authors.forename: Marcelle
authors.initials: M
authors.lastname: Dafré
authors.forename: Mirian C S
authors.initials: MC
authors.lastname: Rinaldi
authors.forename: Marisa
authors.initials: M
authors.lastname: Domingos
mesh_terms: D000393:Air Pollutants / Q000494:pharmacology*; D001205:Ascorbic Acid / Q000378:metabolism; D017753:Ecosystem; D005978:Glutathione / Q000378:metabolism; D005980:Glutathione Reductase / Q000378:metabolism; D010084:Oxidation-Reduction / Q000187:drug effects; D018384:Oxidative Stress / Q000187:drug effects; D010126:Ozone / Q000494:pharmacology*; D010940:Plant Proteins / Q000378:metabolism; D014026:Nicotiana / Q000187:drug effects / Q000378:metabolism*
chemical_list: D000393:Air Pollutants; D010940:Plant Proteins; D010126:Ozone; D005980:Glutathione Reductase; D005978:Glutathione; D001205:Ascorbic Acid