Differentially expressed TF genes and classification of TF families. TF genes were classified into TF families by using publicly available Arabidopsis TF databases [Database of Arabidopsis Transcription Factors (DATF); Plant Transcription Factor Database (PlnTFDB); cotton Transcription Factor (http://planttfdb.cbi.pku.edu.cn:9010/web/index.php?sp=gh)]. The 466 TF genes were classified into 22 TF families. Numbers represent the percentage of TF families out of the 466 TF genes. The classification and annotation of all TF genes with respect to functional categories and transcription factor families are presented in Additional file 8 TableS7.