Levels of phenolic compounds in Tibouchina pulchra after fumigation with ozone

Autor(es)

da Rosa Santos, Ana Clara ^[1] ; Furlan, Claudia Maria ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed ABC, BR-09210580 Santo Andre, SP - Brazil

^[2] Univ Sao Paulo, Inst Biociencias, Dept Bot, BR-05508090 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ATMOSPHERIC POLLUTION RESEARCH; v. 4, n. 3, p. 250-256, JUL 2013.
• Citações Web of Science: 7

Resumo

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+O-3), 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+O-3 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+O-3 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. (AU)

• Processo FAPESP: 99/06971-9 - Composicao quimica de individuos jovens de tibouchina pulchra e psidium guajava expostas a poluicao atmosferica de cubatao, sp.
• Beneficiário: Cláudia Maria Furlan
• Modalidade de apoio: Bolsas no Brasil - Doutorado