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. 2022 Mar 8;23(6):2936. doi: 10.3390/ijms23062936

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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The auxin status influences the response to photoperiod stress. (a) Lesion formation of leaves in five-week-old Col-0, ahk2,3, tir1afb2,3 and yuc1D plants the day after the photoperiod stress treatment. (b) Efficiency of photosystem II (F_v/F_m) of leaves the day after the photoperiod stress treatment (one-way ANOVA; p ≤ 0.05; n = 15). Transcript abundance of stress marker genes BAP1 (c), ZAT12 (d) and CAB2 (e) 0 and 15 h after the PLP treatment compared to respective control plants. The expression level of wild type at the end of the PLP treatment (0 h) was set to 1 (one-way ANOVA; p ≤ 0.05; n ≥ 3). (f) Peroxide content expressed as nmol H₂O₂ equivalents g⁻¹ FW in leaves 15 h after PLP treatment (one-way ANOVA; p ≤ 0.05; n = 4). Letters indicate significantly different statistical groups. Error bars indicate SE. Pictures of representative plants exposed to a 24 h prolongation of the light period are shown in Supplementary Figure S4a.