Anthocyanins and tannins in ozone-fumigated guava trees.
Psidium guajava "Paluma", a tropical tree species, is known to be an efficient ozone indicator in tropical countries. When exposed to ozone, this species displays a characteristic leaf injury identified by inter-veinal red stippling on adaxial leaf surfaces. Following 30 days of three ozone treatments consisting of carbon filtered air (CF - AOT40=17 ppb h), ambient non-filtered air (NF - AOT40=542 ppb h) and ambient non-filtered air+40 ppb ozone (NF+O(3) - AOT40=7802 ppb h), the amounts of residual anthocyanins and tannins present in 10 P. guajava ("Paluma") saplings were quantified. Higher amounts of anthocyanins were found in the NF+O(3) treatment (1.6%) when compared to the CF (0.97%) and NF (1.30%) (p<0.05), and of total tannins in the NF+O(3) treatment (0.16%) compared to the CF (0.14%). Condensed tannins showed the same tendency as enhanced amounts. Regression analyses using amounts of tannins and anthocyanins, AOT40 and the leaf injury index (LII), showed a correlation between the leaf injury index and quantities of anthocyanins and total tannins. These results are in accordance with the association between the incidence of red-stippled leaves and ozone polluted environments.
de Rezende
Fernanda Mendes
FM
Universidade Estadual Paulista Júlio de Mesquita Filho, Bauru, São Paulo, Brazil.
Furlan
Cláudia Maria
CM
D000393:Air Pollutants / Q000633:toxicity*; D000872:Anthocyanins / Q000032:analysis*; D004784:Environmental Monitoring; D010126:Ozone / Q000633:toxicity*; D018515:Plant Leaves / Q000378:metabolism; D031647:Psidium / Q000378:metabolism*; D012044:Regression Analysis; D013634:Tannins / Q000032:analysis*
D000393:Air Pollutants; D000872:Anthocyanins; D013634:Tannins; D010126:Ozone