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. 2017 Jun 15;8:1020. doi: 10.3389/fpls.2017.01020

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Copyright © 2017 Cotrozzi, Pellegrini, Guidi, Landi, Lorenzini, Massai, Remorini, Tonelli, Trivellini, Vernieri and Nali.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Time course of abscisic acid (ABA; A) and proline (Pro; B) in Quercus ilex plants well-watered (open circle) or water stressed (20% of the effective evapotranspiration daily for 15 days, closed circle) and exposed to acute ozone (200 nL L^-1 for 5 h). Data are shown as mean ± standard deviation. The measurements were carried out at 0, 1, 2, 5, 8, and 24 h from the beginning of exposure. According to the two-way ANOVA with treatment and time as variability factors, different letters indicate significant differences (P = 0.05). DW, dry weight. The thick bottom-line indicates the time (5 h) of ozone exposure.