Levels of phenolic compounds in Tibouchina pulchra after fumigation with ozone

Developmental Biology

Claudia Maria Furlan¹  Ana Clara da Rosa Santos² 

[1] Departamento de Botânica, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, 277, CEP 05508–090, São Paulo, SP, Brazil$$;Universidade Federal do ABC, Avenida dos Estados, 5001, CEP 09210–580, Santo André, SP, Brazil$$

关键词: Tibouchina pulchra;    flavonoid;    tannin;    anthocyanin;    air pollution;   

DOI  :  10.5094/APR.2013.027

学科分类：农业科学（综合）

来源: Dokuz Eylul Universitesi * Department of Environmental Engineering

【 摘 要 】

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<0.01). Results suggest alteration on phenolic metabolism when saplings are ozone fumigated; those responses, considered T. pulchra, seem to occur before leaf injury appeared, once contents of flavonoids and tannins are also altered by NF treatment (AOT40=910 ppb h^–1). This study demonstrates that total phenolic and tannins contents of saplings of T. pulchra also decreased when exposed to ozone. The same alterations were observed for T. pulchra after industrial air pollution, suggesting the reduction on total phenolic and tannins probably is a characteristic response of T. pulchra to presence of any kind of pollutant.

【 授权许可】

Unknown   

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