Genome-Wide Identification of TCP Gene Family in and Their Expression Patterns in .

The TCP gene family are plant-specific transcription factors that play important roles in plant growth and development. , , and are orchids with a high ornamental value, but few studies have investigated the specific functions of s in flower development. In this study, we used these three species to analyze s, examining their physicochemical properties, phylogenetic relationships, gene structures, and expression profiles. A total of 50 s were identified across three species; they were divided into two clades-Class-I (PCF subfamily) and Class-II (CIN and CYC/TB1 subfamilies)-based on their phylogenetic relationships. Our sequence logo analysis showed that almost all s contain a conserved TCP domain, as well as the existence of fewer exons, and the -regulatory elements of the s were mostly related to light response. In addition, our transcriptomic data and qRT-PCR results showed that and had a significant impact on lateral organs. Moreover, changes in the expression level of suggested its important role in the phenotypic variation of floral organs. Therefore, this study provides a significant reference for the further exploration of TCP gene functions in the regulation of different floral organs in orchids.