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. 2017 Aug 23;7:9200. doi: 10.1038/s41598-017-07872-8

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Expression profiles of DoWRKY genes with an expression pattern in roots, stems and leaves of Dendrobium officinale under cold (4 °C) stress. (A and B) Clustering of DoWRKY genes according to their expression profiles in roots and stems after cold treatments at four time points (0, 2, 6 and 12 h). The expression of the 63 DoWRKY genes was assessed based on an analysis of qPCR results. (C) Heat map showing expression pattern of DoWRKY genes in leaves under cold stress for 20 h. The Y-axis represents the value of the relative expression level [log 2 (mean of FPKM + 1)].