Levels of phenolic compounds in Tibouchina pulchra after fumigation with ozone
| Autor: | Cláudia Maria Furlan, Ana Clara da Rosa Santos |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
Pollutant Atmospheric Science Ozone biology Chemistry Melastomataceae air pollution Flavonoid Fumigation Tibouchina pulchra biology.organism_classification Pollution anthocyanin tannin chemistry.chemical_compound Horticulture Anthocyanin Botany Tannin flavonoid Waste Management and Disposal ÁRVORES |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 1309-1042 |
| Popis: | Tibouchina pulchra (Cham.) Cogn. (Melastomataceae) is a native tree species from the southeast region of Brazil. This early successional species significantly contributes to the characteristic physiognomy and structure of the Atlantic Rain Forest. Saplings were exposed to carbon filtered air (CF), ambient non–filtered air (NF), and ambient non–filtered air +40 ppb ozone (NF+O3), 8 h per day during two months, using open top chambers (OTC). The AOT40 values at the end of the experiment were 48, 910 and 12 895 ppb h–1, respectively for each treatment. After 25 days of exposure, interveinal red stippling appeared in plants in the NF+O3 chamber (AOT40=3 871 ppb h–1). In the NF chamber, symptoms were observed only after 60 days of exposure (AOT40=910 ppb h–1). No changes were observed for total phenolic contents when comparing ozone treatments. However, amounts of tannins and flavonoids were different among treatments. NF+O3 and NF treatment showed enhanced contents of flavonoids, when tannins seem to be reduced after ozone fumigation (p |
| Databáze: | OpenAIRE |
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