Genome-Wide Analysis of Strictosidine Synthase-like Gene Family Revealed Their Response to Biotic/Abiotic Stress in Poplar.

The () gene family is a small plant immune-regulated gene family that plays a critical role in plant resistance to biotic/abiotic stresses. To date, very little has been reported on the gene in plants. In this study, a total of thirteen s genes were identified from poplar, and these were classified into four subgroups based on multiple sequence alignment and phylogenetic tree analysis, and members of the same subgroup were found to have similar gene structures and motifs. The results of the collinearity analysis showed that poplar s had more collinear genes in the woody plants and . The promoter analysis revealed that the promoter region of s contains a large number of biotic/abiotic stress response elements. Subsequently, we examined the expression patterns of s following drought, salt, and leaf blight stress, using RT-qPCR to validate the response of s to biotic/abiotic stresses. In addition, the prediction of transcription factor (TF) regulatory networks identified several TFs, such as , , , , , and so on, that may be induced in the expression of s in response to adversity stress. In conclusion, this study provides a solid basis for a functional analysis of the gene family in response to biotic/abiotic stresses in poplar.