| Summary: | The transcription factor (TFs) BES1, which mediates brassinosteroid (BR) signaling, regulates plant growth and development. However, <i>BES1</i> genes have not yet been reported in Tartary buckwheat. Here, ten <i>FtBES1</i> genes were identified in the Tartary buckwheat genome, and they were named <i>FtBES1-1</i> to <i>FtBES1-10</i>. These genes were divided into four groups according to the classification in <i>Arabidopsis thaliana</i>. Multiple sequence alignment indicated that all BES1 gene members contained the BES1_N structural domain. Phylogenetic relationship <i>FtBES1</i> genes in the same group had similar gene structures and motifs. An analysis of cis-acting elements demonstrated that the BES1 TFs contains many light-responsive, hormonal, and abiotic stress-responsive elements, etc. The 10 <i>FtBES1</i> genes were located on four chromosomes of Tartary buckwheat, and gene distribution and synteny analysis revealed that segmental duplications have played important roles in <i>FtBES1</i> gene family expansion. Tissue specificity revealed that all of the ten <i>FtBES1</i> members expressed highly in two periods, and relatively high expression levels were observed in mature leaves. Gene expression profiles under different hormone treatments demonstrated that <i>FtBES1</i> gene family participated in the hormone stress response. This study enriches our knowledge of the Tartary buckwheat BES1 gene family and provides a theoretical basis for analyzing the biological functions and stress tolerance mechanisms of the Tartary buckwheat BES1 transcription factors.
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