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Backgrounds  Cyclic nucleotide gated channels (CNGCs) play multifaceted roles in plant physiological processes, especially with respect to signalling processes, plant development, and responses to environmental stresses. However, little information is known about the CNGC family in the large cosmopolitan family  Rhamnaceae , which has strong tolerance to biotic and abiotic stresses.    Results  In the current study, a total of 15  ZjCNGCs  which located on 7 chromosomes were firstly identified in Chinese jujube ( Ziziphus jujuba  Mill.), the most important species of  Rhamnaceae  in terms of economic and ecological values. Phylogenetic analysis showed that these  ZjCNGCs  could be classified into four groups,  ZjCNGC12  belonged to group IVA, and  ZjCNGC13 ,  14 ,  15  belonged to group IVB. In addition, the paralogous and orthologous homology duplication of  ZjCNGC15  occurred during the evolutionary process. The characteristics of  ZjCNGCs  regarding to exon-intron numbers and post-translational modifications showed diversified structures and functions. Motif composition and protein sequence analysis revealed that the phosphate-binding cassette and hinge regions were conserved among ZjCNGCs. Prediction of the  cis -acting regulatory elements and expression profiles by real-time quantitative PCR analysis showed that some of the  ZjCNGCs  responded to environmental changes, especially  ZjCNGC2 , which was significantly downregulated in response to cold stress, and  ZjCNGC4  was highly induced in response to cold, salt and alkaline stresses.  ZjCNGC13  and  14  were highly induced in the phytoplasma-resistant cultivar and downregulated in the susceptible cultivar. Furthermore,  ZjCNGC2  could be regulated by cAMP treatment, microtubule changes and interact with ZjMAPKK4, which suggested that cAMP and microtubule might play important roles in  ZjCNGC2  mediated  ZjMAPKK4  signalling transduction involved in cold stress.    Conclusions  The identification and classification analysis of  ZjCNGCs  were firstly reported, and some key individual  ZjCNGCs  might play essential roles in the response to biotic and abiotic stresses, especially  ZjCNGC2  mediated  ZjMAPKK4  signalling transduction involved in cold stress. This systematic analysis could provide important information for further functional characterization of  ZjCNGCs  with the aim of breeding stress-resistant cultivars.

Genome-wide identification of CNGC genes in Chinese jujube (Ziziphus jujuba Mill.) and ZjCNGC2 mediated signalling cascades in response to cold stress