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The present study aimed to study if the intensity and precocity of short-term leaf responses of Nicotiana tabacum 'Bel-W3' depended on the daily atmospheric levels of ozone and/or daily meteorological conditions in a State Park located in the city of São Paulo, SE Brazil. From 16 September to 14 October 2002, three lots of six potted plants were exposed for fourteen days. Leaf necrosis, atmospheric ozone concentrations and meteorological parameters were daily measured. The average percentage of leaf necrosis ranged from 5% to 20%. A 4th degree polynomial model was proposed to explain daily progress of leaf necrosis on plants. The average ozone levels were increased from morning (1.3-39.2 ppbv) to the midday (1.6-52.0 ppbv) and decreased in the evening (0.5-39.9 ppbv). Daily pattern of accumulated percentage of leaf necrosis was not strictly related to ozone, but was influenced by the meteorological conditions and stage of development of leaves. O estudo objetivou verificar se a intensidade e precocidade de respostas foliares de curto prazo de Nicotiana tabacum 'Bel-W3' dependem dos níveis atmosféricos de ozônio e/ou das condições meteorológicas diárias em um Parque Estadual localizado na cidade de São Paulo, SE-Brasil. Entre 16 de setembro e 14 de outubro de 2002, três lotes contendo seis plantas envasadas foram expostos no ambiente por quinze dias. Necroses foliares, concentrações atmosféricas de ozônio e parâmetros meteorológicos foram medidos diariamente. A porcentagem média de área foliar com necroses variou de 5% a 20%. Um modelo polinomial de quarto grau foi proposto para explicar o progresso diário das necroses foliares nas plantas. Os níveis médios de ozônio aumentaram a partir da manhã (1.3-39.2 ppbv) até o meio dia (1.6-52.0 ppbv), diminuindo a tarde (0.5-39.9 ppbv). O padrão diário de aumento de área foliar com necroses não foi relacionado estritamente com ozônio, mas foi influenciado pelas condições meteorológicas e pelo estágio de desenvolvimento das folhas

Short-term leaf responses of Nicotiana tabacum 'Bel-W3' to ozone under the environmental conditions of São Paulo, SE - Brazil