Establishing the redox potential of Tibouchina pulchra (Cham.) Cogn., a native tree species from the Atlantic Rain Forest, in the vicinity of an oil refinery in SE Brazil
| Autor: | Marisia Pannia Esposito, Marisa Domingos |
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| Rok vydání: | 2013 |
| Předmět: |
Antioxidant
Health Toxicology and Mutagenesis medicine.medical_treatment Glutathione reductase Ascorbic Acid Extraction and Processing Industry chemistry.chemical_compound Tibouchina pulchra Ascorbate Peroxidases Ozone Air Pollution Malondialdehyde medicine Environmental Chemistry Petroleum Pollution Air Pollutants Air pollutant concentrations biology food and beverages General Medicine Glutathione APX Ascorbic acid biology.organism_classification Catalase Pollution Oxidative Stress Glutathione Reductase chemistry Environmental chemistry Melastomataceae Reactive Oxygen Species Oxidation-Reduction Brazil Environmental Monitoring |
| Zdroj: | Environmental science and pollution research international. 21(8) |
| ISSN: | 1614-7499 |
| Popis: | The present study aimed to establish the seasonal variations in the redox potential ranges of young Tibouchina pulchra plants growing in the Cubatao region (SE Brazil) under varying levels of oxidative stress caused by air pollutants. The plants were exposed to filtered air (FA) and non-filtered air (NFA) in open-top chambers installed next to an oil refinery in Cubatao during six exposure periods of 90 days each, which included the winter and summer seasons. After exposure, several analyses were performed, including the foliar concentrations of ascorbic acid and glutathione in its reduced (AsA and GSH), total (totAA and totG) and oxidized forms (DHA and GSSG); their ratios (AsA/totAA and GSH/totG); the enzymatic activities of superoxide dismutase (SOD), ascorbate peroxidase (APX), catalase (CAT) and glutathione reductase (GR); and the content of malondialdehyde (MDA). The range of antioxidant responses in T. pulchra plants varied seasonally and was stimulated by high or low air pollutant concentrations and/or air temperatures. Glutathione and APX were primarily responsible for increasing plant tolerance to oxidative stress originating from air pollution in the region. The high or low air temperatures mainly affected enzymatic activity. The content of MDA increased in response to increasing ozone concentration, thus indicating that the pro-oxidant/antioxidant balance may not have been reached. |
| Databáze: | OpenAIRE |
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