Genome-Wide Analysis of the PYL Gene Family in and Its Responses to Abiotic Stresses.

Abscisic acid (ABA) is a key phytohormone that participates in various plant biological processes, such as seed germination, senescence, stomatal movement, and flowering. In the ABA signal transduction pathway, Pyrabactin Resistance 1 (PYR1)/PYR1-Like (PYL)/Regulatory Component is the core module for ABA perception. In this study, a total of 12 PYL family members were identified in birch ( Suk.) from a genome-wide range that can be divided into 3 subgroups according to their evolutionary relationships. The physiochemical properties of the 12 s were characterized, and the members of the same subgroups share more similar exon-intron and motif patterns. The results of synteny analysis showed two syntenic gene pairs within BpPYL family members and 12, 8, 19, and 6 syntenic gene pairs between s and s, s, s, and s, respectively. Multiple -acting elements were identified in the promoters of s, including stress response, phytohormone signaling, and growth and development. The results of GO and KEGG enrichment analysis showed that s were enriched in the pathways mainly related to ABA signaling and cell communication. The results of RT-qPCR verified the expressional responses of s to ABA, salt, and PEG treatments. Furthermore, the positive roles of and were proven by using salt-tolerant yeast transformation. This study provides a reference for research on ABA signal transduction and forest tree responses upon abiotic stresses.