Fig. 6

Weighted gene co–expression network analysis (WGCNA) of genes related to cold responses in Dendrobium spp. (A) Soft power plot. The abscissa represents the soft threshold (β), the ordinate represents the scale–free topology model fit index (left), and the mean connectivity index (right); (B) Cluster heatmap of all genes in the 11 modules are shown; (C) Clustering dendrogram of genes and module division. The dynamic tree cut represents the module divided according to the expression of each gene, while the merged dynamic is the result of merging similar modules according to the dynamic tree cut; (D) Correlations between modules and traits (time). Each row corresponds to a module, and each module cell contains the corresponding correlation and p-value