Genome-wide identification and analysis of BES1/BZR1 transcription factor family in potato (Solanum tuberosum. L)

BES1/BZR1 is a kind of transcription factors in brassinosteroid signal pathway, which play a vital role in plant growth and development, the responses to stresses in many plants, like Arabidopsis and rice. However, there are few reports for BES1 in potato, which is an important crop in China. Here, we identified nine potato BES1 genes by genome-wide analysis, and amplified all these CDS sequences which were localized on eight chromosomes. All StBES1 proteins had conserved domains including bHLH domains, BIN2 phosphorylation sites and nucleus localization sites, and shared similar motif compositions. The gene expression displayed differential in different organs and under different hormone and stress treatments. Subcellular localization showed that all StBES1 proteins localized in nucleus and cytoplasm, and transactivation assay indicated these nine StBES1 proteins played roles as transcription factors. All these results provide a theoretic basis for further studying StBES1 functions in potato.