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. 2019 Jun 28;19:285. doi: 10.1186/s12870-019-1882-z

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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 — Functional enrichment analysis of differentially expressed genes in low-sugar (LS) sugarcane before and after ethylene treatment. a The up-regulated functions are displayed with respect to their significance (p < 0.01). Different colors correspond to the ratio of genes in each category. It’s noteworthy that the most enriched function is RNA-related transcription (corresponding to ethylene response factor; ERFs) and hormone-related metabolism and signaling (ethylene-related). These enriched modules will guid the search for the functional networks underpinning ethylene-regulated sugar production/translocation in sugarcane. b the expression of ERFs in HS and LS following ethylene treatment. CK- check (water control), T- ethephon treatment, HS: high-sugar variety, MS: medium-sugar variety, LS: low-sugar variety