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Several studies revealed the important contribution of calcineurin B-like (CBLs) and CBL-interacting kinase (CIPKs) genes in transmitting stress signals in plants. Taking advantage from the genome sequences of the cultivated potato Solanum tuberosum and its wild relatives S. commersonii and S. chacoense, we identified for the first time 10 CBLs and 26 CIPKs genes in each species. The CBLs and CIPKs derived from tandem duplications indicate that these gene families in potato mainly arise through amplification mechanisms. Once annotated, we compared the par excellence model of Arabidopsis thaliana with S. commersonii, the potato model species for studying cold tolerance. We found that four ScCBL proteins (ScCBL1, ScCBL4a, ScCBL4b, and ScCBL9) started with a conserved N-myristoylation motif (MGXXXS/T), which might function in membrane targeting of the CBLs-CIPKs complex. Additionally, expression analyses of S. commersonii CBL and CIPK genes based on RNAseq revealed diverse expression patterns following various abiotic and biotic stresses and in the four tissues analyzed (flowers, leaf, roots, and tubers). Data also suggest that the ScCBLs-ScCIPKs complex may be more responsive to abiotic rather than biotic stimuli. Overall, the results described in the present work will be useful for future investigations and for functional characterization of individual CBLs and CIPKs in Solanum.

Genes involved in stress signals: the CBLs-CIPKs network in cold tolerant Solanum commersonii