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. 2018 Jul 24;18:150. doi: 10.1186/s12870-018-1367-5

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© The Author(s). 2018

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. 2 — Evolutionary analysis of NAC proteins in cotton. a Statistical analysis of exon numbers of NAC genes in G. hirsutum. b The ratio of non-synonymous to synonymous substitutions (d_N/d_S) of NAC genes in inter-genomic (At Dt) and intra-genomic (A2 At and D5 Dt). c The SNP density of GhNAC genes in Upland cotton populations. The gene body, 2 kb upstream and 2 kb downstream sequences of each GhNAC gene were selected for analysis