| Summary: | The <i>TIFY</i> gene family is specific to land plants, exerting immense influence on plant growth and development as well as responses to biotic and abiotic stresses. Here, we identify 25 <i>TIFY</i> genes in the poplar (<i>Populus trichocarpa</i>) genome. Phylogenetic tree analysis revealed these <i>PtrTIFY</i> genes were divided into four subfamilies within two groups. Promoter <i>cis</i>-element analysis indicated most <i>PtrTIFY</i> genes possess stress- and phytohormone-related <i>cis</i>-elements. Quantitative real-time reverse transcription polymerase chain reaction (qRT−PCR) analysis showed that <i>PtrTIFY</i> genes displayed different expression patterns in roots under abscisic acid, methyl jasmonate, and salicylic acid treatments, and drought, heat, and cold stresses. The protein interaction network indicated that members of the <i>PtrTIFY</i> family may interact with COI1, MYC2/3, and NINJA. Our results provide important information and new insights into the evolution and functions of <i>TIFY</i> genes in <i>P. trichocarpa</i>.
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