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. 2018 Nov 27;18:304. doi: 10.1186/s12870-018-1523-y

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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. 1 — Phylogenetic relationship of cotton bHLH/HLH transcription factors. MEGA 6.0 software was employed to construct an unrooted phylogenetic tree based on alignments of 437 bHLH/HLH domains identified from upland cotton (G. hirsutum) using the NeighborJoining (NJ) method with the following parameters: The number of differences model, pairwise deletion and 1000 bootstraps. Subfamilies are collapsed and represented as grey dots with area proportional to member numbers of each subfamily