The miR156/157 family is widely identified in various plant species and plays important regulatory roles in floral induction and stress response. However, information regarding evolution of miR156/157s and their functions during floral induction in walnut (Juglans regia) remains unknown. In this study, four precursors and four mature miR156/157s were identified in J. regia via small RNA sequencing. We constructed phylogenetic trees for precursor sequences of miR156/157s from different plants, as well as J. regia. The...