Leaf characteristics in <i>Vitis vinifera</i> varieties exposed or not to ozone treatment.

Average values (± standard deviation) of leaf characteristics measured on two Vitis vinifera varieties (Aleatico and Trebbiano giallo) fumigated with O3 (80 ppb for 5 h day-1, 8:00–13:00 h + 40 ppb for 5 h day-1, 13:00–18:00 h) or maintained in filtered air for 28 days. Measurements referred to the end of the exposure. For each parameter, the data were analyzed by Student’s t-test. The significant differences are: *** = P≤0.001, ns = P>0.05. Leaf characteristics in Vitis vinifera varieties exposed or not to ozone treatment.