Identification and Characterization of the Gene Family in Three Orchid Species and Functional Analysis of in .

/ (ABA response element binding) proteins in plants are essential for stress responses, while our understanding of / from orchid species, important traditional medicinal and ornamental plants, is limited. Here, twelve / genes were identified within three orchids' complete genomes and classified into three groups through phylogenetic analysis, which was further supported with a combined analysis of their conserved motifs and gene structures. The -element analysis revealed that hormone response elements as well as light and stress response elements were widely rich in the s. A prediction analysis of the orchid /-mediated regulatory network was further constructed through -regulatory element (CRE) analysis of their promoter regions. And it revealed that several dominant transcriptional factor (TF) gene families were abundant as potential regulators of these orchid s. Expression profile analysis using public transcriptomic data suggested that most genes have distinct tissue-specific expression patterns in orchid plants. Additionally, DcaABI5 as a homolog of ABA INSENSITIVE 5 (ABI5) from was selected for further analysis. The results showed that transgenic overexpressing could rescue the ABA-insensitive phenotype in the mutant . Collectively, these findings will provide valuable information on genes in orchids.