Genome-wide identification and expression analysis of gene family reveal their involvement in hormone response and abiotic stresses in .

promoter-binding-protein (SBP)-box family proteins are a class of plant-specific transcription factors, and widely regulate the development of floral and leaf morphology in plant growth and involve in environment and hormone signal response. In this study, we isolated and identified 21 non-redundant genes in with bioinformatics analysis. Sequence alignments of 21 CnSBP proteins discovered a highly conserved SBP domain including two zinc finger-like structures and a nuclear localization signal region. According to the amino acid sequence alignments, 67 genes from , rice, and were clustered into eight groups, and the motif and gene structure analysis also sustained this classification. The gene evolution analysis indicated the genes experienced a duplication event about 10 million years ago (Mya), and the and genes occurred a divergence at 24 Mya. Transcriptome data provided valuable information for tissue-specific expression profiles of the , which highly expressed in floral tissues and differentially expressed in leaf, root and stem organs. Quantitative Real-time Polymerase Chain Reaction data showed expression patterns of the under exogenous hormone and abiotic stress treatments, separately abscisic acid, salicylic acid, gibberellin A3, methyl jasmonate and ethylene spraying as well as salt and drought stresses, indicating that the candidate genes showed differentiated spatiotemporal expression patterns in response to hormone and abiotic stresses. Our study provides a systematic genome-wide analysis of the gene family in . In general, it provides a fundamental theoretical basis that genes may regulate the resistance of stress physiology in chrysanthemum via exogenous hormone pathways.