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Wild potatoes, as dynamic resource adapted to various environmental conditions, represent a powerful and informative reservoir of genes useful for breeding efforts. WRKY transcription factors (TFs) are encoded by one of the largest families in plants and are involved in several biological processes such as growth and development, signal transduction, and plant defence against stress. In this study, 79 and 84 genes encoding putative WRKY TFs have been identified in two wild potato relatives,  Solanum commersonii  and  S. chacoense . Phylogenetic analysis of WRKY proteins divided  ScWRKYs  and  SchWRKYs  into three Groups and seven subGroups. Structural and phylogenetic comparative analyses suggested an interspecific variability of WRKYs. Analysis of gene expression profiles in different tissues and under various stresses allowed to select  ScWRKY045  as a good candidate in wounding-response,  ScWRKY055  as a bacterial infection triggered  WRKY  and  ScWRKY023  as a multiple stress-responsive  WRKY  gene. Those  WRKYs  were further studied through interactome analysis allowing the identification of potential co-expression relationships between  ScWRKYs / SchWRKYs  and genes of various pathways. Overall, this study enabled the discrimination of  WRKY  genes that could be considered as potential candidates in both breeding programs and functional studies.

WRKY genes family study reveals tissue-specific and stress-responsive TFs in wild potato species