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. 2020 Jan 8;20:12. doi: 10.1186/s12870-019-2191-2

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© The Author(s). 2020

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. 8 — Phloroglucinol staining of tobacco plants. The staining color was obviously deeper in the TLs than that in the CL. And the three TLs showed three levels of staining color, which indicates three levels of lignification. TL1, 3, 5, transgenic lines; CL, control line; E, epidermis; C, cortex; VB, vascular bundles