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. 2021 Feb 8;21:83. doi: 10.1186/s12870-021-02869-y

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 5 — Lignin deposition regulated by ABA, H₂O₂ and JA under PEG treatment. a, c, e, Effects of ABA, H₂O₂, JA and their corresponding inhibitor or scavenger on lignin contents under PEG treatments. b, d, f, histochemical staining of xylem tissue from the 3rd internode of stems from melon seedlings with phloroglucinol-HCl for lignin observation. mx: metaxylem; px: protoxylem. Different lowercase letters indicate significant differences from control using Duncan’s Multiple Range Test (P< 0.05). Bars=50 μm