Co-expression network analysis of transcripts involved in temperature stress (TS) in maize seedling leaves. (A) The weighted gene co-expression network (WGCNA) identified 16 modules presented by hierarchical cluster tree and color bands. (B) Analysis of the module–trait association. Each row represents a module, and each column represents a sample under TS conditions. The numbers on the top and bottom of each cell represent the correlation and significant p-values, respectively. The number of genes in each module is presented in the bracket. (C) Heatmap indicating the eigengene expression profile for nine significantly associated modules in ELT, MLT, LT, NT, HT, MHT, and EHT. ELT, extreme low temperature, 4 °C; MLT, medium low temperature, 10 °C; LT, low temperature, 16 °C; NT, normal temperature, 25 °C; HT, high temperature, 37 °C; MHT, medium high temperature, 42 °C; and EHT, extreme high temperature, 48 °C.