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. 2019 Apr 25;19:154. doi: 10.1186/s12870-019-1744-8

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 6 — Expression profiles of poplar TTF genes across different tissues and developmental stages as revealed by qRT-PCR. Y-axis: relative expression levels; X-axis: the time course of stress treatments; Error bars, 6 ± SE. The abbreviation represents specific developmental stages: leaf (L); young leaf (YL); root (R); rhizome (RH); shoot (S); stem (St)