Identification and Expression Profiling of the bZIP Gene Family Throughout the Genome in Phoebe bournei under Abiotic Stress

Abstract

The bZIPgene family plays a crucial role in supporting plant life as one of the most important transcription factors. Its involvement in various processes such as light signaling, seed maturation, flower development, and cell elongation has been established, but limited to perennial and agricultural crops. This study focused on the classification of 71 bZIP genes across 12 chromosomes based on their evolutionary relationships. Each group exhibited distinct gene structures and variations in the number of conserved motifs. The presence of multiple cis-acting elements suggested that the PbbZIP gene family played a vital role in hormonal and regulatory signaling, which were essential for plant growth, development, and resilience against abiotic stress. RNA and qPCR analysis revealed expression levels of PbbZIP32, PbbZIP14, PbbZIP26, PbbZIP67, and PbbZIP69 under salt, drought, and temperature stress conditions. This research contributed to a deeper understanding of the underlying mechanisms governing stress resistance, growth, and development processes mediated by the bZIP gene family. It also can serve as a foundation for future investigations on the bZIPgene family in forestry species.