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. 2018 Jul 2;9:917. doi: 10.3389/fpls.2018.00917

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Copyright © 2018 Lo Piccolo, Landi, Pellegrini, Agati, Giordano, Giordani, Lorenzini, Malorgio, Massai, Nali, Rallo, Remorini, Vernieri and Guidi.

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) and the copyright owner(s) 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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Photosystem II maximum photochemical efficiency (F_v/F_m; A), minimal fluorescence yield (F₀; B), effective photochemical efficiency (φ_PSII; C), and non-photochemical quenching (NPQ; D) in 1-, 7-, and 13-week-old leaves of Prunus cerasifera clone 29C and Prunus cerasifera var. Pissardii. Means (±SD; n = 5) were compared by two-way ANOVA with morph and sampling date as sources of variation. Means flanked by the same letter are not statistically different for P = 0.05 after Fisher's least significant difference post-hoc test. Lack of letters denotes non statistical significance of the interaction.