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. 2019 Jun 21;19:271. doi: 10.1186/s12870-019-1859-y

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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. 3 — Heat map hierarchical clustering showing the expression of genes assessed by qPCR. Values represent relative normalised expression values. The colour bar indicates the expression values as an increasing intensity gradient. Numbers refer to the Pearson correlation coefficient between the lengths of two branches. ACS (1-aminocyclopropane-1-carboxylic acid synthase), ACO (1-aminocyclopropane-1-carboxylic acid oxidase), ERF (ethylene responsive factor), ETR (ethylene-resistant), 4CL (4-coumarate ligase), C4H (cinnamate-4-hydroxylase), COMT (caffeate O-methyltransferase), CCR (cinnamoyl-CoA reductase), CAD (cinnamyl alcohol dehydrogenase), PAL (phenylalanine ammonia lyase)