The bZIP Transcription Factors in Current Jasmine Genomes: Identification, Characterization, Evolution and Expressions

Jasmine, a recently domesticated shrub, is renowned for its use as a key ingredient in floral tea and its captivating fragrance, showcasing significant ornamental and economic value. When cultivated to subtropical zone, a significant abiotic stress adaptability occurs among different jasmine varieties, leading to huge flower production changes and plantlet survival. The bZIP transcription factors (TFs) are reported to play indispensable roles in abiotic stress tolerance. Here, we performed a genome-level comparison of bZIPs using three-type jasmine genomes. Based on their physicochemical properties, conserved motif analysis and phylogenetic analysis, about 63 bZIP genes were identified and clustered in jasmine genomes, noting a difference of one member compared to the other two types of jasmines. The HTbZIP genes were categorized into 12 subfamilies compared with A. thaliana. In cis-acting element analysis, all genes contained light-responsive elements. The abscisic acid response element (ABRE) was the most abundant in HTbZIP62 promoter, followed by HTbZIP33. Tissue-specific genes of the bZIPs may play a crucial role in regulating the development of jasmine organs and tissues, with HTbZIP36 showing the most significant expressions in roots. Combined with complicated protein interactions, HTbZIP62 and HTbZIP33 might play a crucial role in the ABA signaling pathway and stress tolerance. Combined with RT-qPCR analysis, SJbZIP37/57/62 were more sensitive to ABA response genes compared with other bZIPs in DJ amd HT genomes. Our findings provide a useful resource for further research on the regulation of key genes to improve abiotic stress tolerance in jasmine.