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Background  Abscisic acid (ABA) signaling plays a crucial role in developmental and environmental adaptation processes of plants. However, the PYL-PP2C-SnRK2 families that function as the core components of ABA signaling are not well understood in banana.    Results  In the present study, 24  PYL , 87  PP2C , and 11  SnRK2  genes were identified from banana, which was further supported by evolutionary relationships, conserved motif and gene structure analyses. The comprehensive transcriptomic analyses showed that banana  PYL-PP2C-SnRK2  genes are involved in tissue development, fruit development and ripening, and response to abiotic stress in two cultivated varieties. Moreover, comparative expression analyses of  PYL-PP2C-SnRK2  genes between BaXi Jiao (BX) and Fen Jiao (FJ) revealed that  PYL-PP2C-SnRK2 -mediated ABA signaling might positively regulate banana fruit ripening and tolerance to cold, salt, and osmotic stresses. Finally, interaction networks and co-expression assays demonstrated that the core components of ABA signaling were more active in FJ than in BX in response to abiotic stress, further supporting the crucial role of the genes in tolerance to abiotic stress in banana.    Conclusions  This study provides new insights into the complicated transcriptional control of  PYL-PP2C-SnRK2  genes, improves the understanding of  PYL-PP2C-SnRK2 -mediated ABA signaling in the regulation of fruit development, ripening, and response to abiotic stress, and identifies some candidate genes for genetic improvement of banana.    Electronic supplementary material  The online version of this article (doi:10.1186/s12870-017-1093-4) contains supplementary material, which is available to authorized users.

bmc plant biology

The core regulatory network of the abscisic acid pathway in banana: genome-wide identification and expression analyses during development, ripening, and abiotic stress