Fig. 7

Weighted gene co-expression network analysis (WGCNA) of differentially expressed genes (DEGs) identified in genotypes A and C over three-time stages under low N stress. (A) Gene cluster dendrogram and 19 gene module divisions of DEGs, in which a major tree branch represents a module, and different colors represent different modules. (B) Correlation heatmap between modules and traits. Each column presents the experimental traits. The number in the oval box represents the correlation coefficient, which ranges from − 1 (cyan) to 1 (red). We set an absolute value of the correlation coefficient greater than 0.75 to indicate that there is a strong correlation between gene modules and traits. The number in the rectangular box on the right indicates the number of the genes contained in the corresponding gene module