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Background  Glycosyltransferases comprise a highly divergent and polyphyletic multigene family that is involved in widespread modification of plant secondary metabolites in a process called glycosylation. According to conserved domains identified in their amino acid sequences, these glycosyltransferases can be classified into a single UDP-glycosyltransferase (UGT) 1 superfamily.    Results  We performed genome-wide comparative analysis of UGT genes to trace evolutionary history in algae, bryophytes, pteridophytes, and angiosperms; then, we further investigated the expansion mechanisms and function characterization of UGT gene families in  Brassica rapa  and  Brassica oleracea . Using Hidden Markov Model search, we identified 3, 21, 140, 200, 115, 147, and 147 UGTs in  Chlamydomonas reinhardtii ,  Physcomitrella patens ,  Selaginella moellendorffii ,  Oryza sativa ,  Arabidopsis thaliana ,  B. rapa , and  B. oleracea , respectively. Phylogenetic analysis revealed that UGT80 gene family is an ancient gene family, which is shared by all plants and UGT74 gene family is shared by ferns and angiosperms, but the remaining UGT gene families were shared by angiosperms. In dicot lineage, UGTs among three species were classified into three subgroups containing 3, 6, and 12 UGT gene families. Analysis of chromosomal distribution indicates that 98.6 and 71.4% of UGTs were located on  B. rapa  and  B. oleracea  pseudo-molecules, respectively. Expansion mechanism analyses uncovered that whole genome duplication event exerted larger influence than tandem duplication on expansion of UGT gene families in  B. rapa , and  B. oleracea . Analysis of selection forces of UGT orthologous gene pairs in  B. rapa , and  B. oleracea  compared to  A. thaliana  suggested that orthologous genes in  B. rapa , and  B. oleracea  have undergone negative selection, but there were no significant differences between  A. thaliana  – B. rapa  and  A. thaliana  – B. oleracea  lineages. Our comparisons of expression profiling illustrated that UGTs in  B. rapa  performed more discrete expression patterns than these in  B. oleracea  indicating stronger function divergence. Combing with phylogeny and expression analysis, the UGTs in  B. rapa  and  B. oleracea  experienced parallel evolution after they diverged from a common ancestor.    Conclusion  We first traced the evolutionary history of UGT gene families in plants and revealed its evolutionary and functional characterization of UGTs in  B. rapa , and  B. oleracea . This study provides novel insights into the evolutionary history and functional divergence of important traits or phenotype-related gene families in plants.    Electronic supplementary material  The online version of this article (doi:10.1186/s12864-017-3844-x) contains supplementary material, which is available to authorized users.

bmc genomics

Genome-wide analysis of UDP-glycosyltransferase super family in Brassica rapa and Brassica oleracea reveals its evolutionary history and functional characterization