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In plants, both abscisic acid (ABA) dependent and independent pathways form the basis for the response to environmental stresses. Sucrose non-fermenting 1-related protein kinase 2 (SnRK2) plays a central role in plant stress signal transduction. However, complete annotation and specific expression patterns of  SnRK2s  in sugarcane remain unclear. For the present study, we performed a full-length cDNA library survey of sugarcane, thus identifying ten  SoSnRK2  genes via phylogenetic, local BLAST methods, and various bioinformatics analyses. Phylogenetic analysis indicated division of  SoSnRK2  genes into three subgroups, similar to other plant species. Gene structure comparison with  Arabidopsis  suggested a unique evolutionary imprint of the  SnRK2  gene family in sugarcane. Both sequence alignment and structural annotation provided an overview of the conserved N-terminal and variations of the C-terminal, suggesting functional divergence. Transcript and transient expression assays revealed  SoSnRK2s  to be involved in the responses to diverse stress signals, and strong ABA induction of  SoSnRK2s  in subgroup III. Co-expression network analyses indicated the existence of both conserved and variable biological functions among different  SoSnRK2s  members. In summary, this comprehensive analysis will facilitate further studies of the  SoSnRK2  family and provide useful information for the functional validation of  SoSnRK2s .

Molecular Characterization and Co-expression Analysis of the SnRK2 Gene Family in Sugarcane (Saccharum officinarum L.)