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. 2017 Jul 10;8:1179. doi: 10.3389/fpls.2017.01179

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Copyright © 2017 Fina, Masotti, Rius, Crevacuore and Casati.

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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Primary root inhibition assays in WT, haf1 and haf2 plants after UV-B exposure. Graph of average root lengths in Col-0 and haf1-3 plants (A), Ws and hag1-4 plants (C), and Col and haf2-3 and haf2-4 plants (E) up to 4 days after a UV-B treatment or under control conditions in the absence of UV-B (control, C). Statistical significance was analyzed using ANOVA, Tukey test with P < 0.05; differences from the control are marked with different letters. The average root lengths after UV-B exposure relative to the length in control seedlings is shown in (B), (D,F); differences from the control are marked with different letters. The differences in primary root length of WT plants in the different panels are due to differences in developmental phases of the seedlings used when each UV-B irradiation was done in each experiment. Results represent the average of 20 biological replicates ±SEM.