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. 2019 Feb 8;19:63. doi: 10.1186/s12870-019-1667-4

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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. 5 — Concentration of ABA (a), IAA (b), SA (c) and JA (d) in leaves. LN, low nitrogen. AN, adequate nitrogen. ABA, abscisic acid. IAA, indole acetic acid. SA, salicylic acid. JA, jasmonic acid. The bars indicate means ± SE (n = 4). Different letters on the bars indicate significant differences (P < 0.05) based on multiple comparisons (Tukey’s HSD test) in ANOVA. P-values of the two-way ANOVA of water (W), nitrogen (N) and their interactions (W × N) are indicated. *P < 0.05; **P < 0.01; ns, not significant