Fig. 4

The expression of transcription factor genes in roots of Z. xanthoxylum under heat treatments. (a) and (b) show the number of DEGs at 40 °C and 45 °C for 0.5 h, respectively; (c) and (d) show the number of DEGs at 40 °C and 45 °C for 6 h, respectively. The red upward arrows and black downward arrows show the total number of up-regulated DEGs and down-regulated DEGs, respectively. Venn diagrams showing the number of unique and common DEGs related to HSFs (e), MYBs (f), AP2/ERFs (g) and WRKYs (h) in roots of Z. xanthoxylum at 40 °C and 45 °C for 0.5 h and 6 h