Transcriptome and metabolome profiling unveil the mechanisms of Ziziphus jujuba Mill. peel coloration

•Transcriptomic and metabolic analysis of jujube fruit peel coloring during ripening.•Strong accumulation of malvidin and delphidin correlated with peel reddening.•Differentially expressed genes in the flavonoid synthesis pathway identified.•3 UFGT genes may play essential functions for the accumulation of anthocyanins.