*4.3. Expression Profiles Analysis Using Microarray and RNA-seq Data*

For expression profiling of the BSK genes in *Arabidopsis*, we utilized the *Arabidopsis* ATH1 microarray data (*Arabidopsis* eFP Browser 2.0), root RNA-seq data bases (https://sites.lsa.umich.edu/ pgrp-roots/) and AtRTD2 [50]. Different tissues of *Arabidopsis* and the seedlings under various stresses were analyzed. The gene expression patterns of each tissue were analyzed, and the expression values were log2 transformed from The Bio-Analytic Resource for Plant Biology (BAR). Finally, heat maps of hierarchical clustering were visualized using the Heml software. For data retrieved from RNA-seq data bases, the transcript abundance was expressed as fragments per kilobase of exon model per million mapped reads (FPKM) or Transcript Per Million.
