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The family of DNA binding with one finger (DOF) transcription factors is plant specific, and these proteins contain a highly conserved domain (DOF domain) of 50-52 amino acids that includes a C2C2-type zinc finger motif at the N-terminus that is known to function in a number of plant processes. Here, we characterized 20  DOF  genes in the important ornamental species chrysanthemum ( Chrysanthemum morifolium ) based on transcriptomic sequences. Phylogenetic analysis identified one pair of putative orthologous proteins in  Arabidopsis  and chrysanthemum and six pairs of paralogous proteins in chrysanthemum. Conserved motifs in the DOF proteins shared by  Arabidopsis  and chrysanthemum were analyzed using MEME. Bioinformatics analysis revealed that 13  CmDOFs  could be targeted by 16 miRNA families. Moreover, we used 5' RLM-RACE to map the cleavage sites in  CmDOF3, 15 , and  21 . The expression of these 20 genes in response to phytohormone treatments and abiotic stresses was characterized, and the expression patterns of six pairs of paralogous  CmDOF  genes were found to completely differ from one another, except for  CmDOF6  and  CmDOF7 . This work will promote our research of the various functions of  DOF  gene family members in plant hormone and stress responses.

Transcriptome-Wide Identification and Expression Profiling of the DOF Transcription Factor Gene Family in Chrysanthemum morifolium