Genome-Wide Analysis of the UDP-Glycosyltransferase Family Reveals Its Roles in Coumarin Biosynthesis and Abiotic Stress in .

Coumarins, natural products abundant in , confer features in response to abiotic stresses, and are mainly present as glycoconjugates. UGTs (UDP-glycosyltransferases) are responsible for glycosylation modification of coumarins. However, information regarding the relationship between coumarin biosynthesis and stress-responsive s remains limited. Here, a total of 189 genes were identified from the genome, which were distributed differentially among its eight chromosomes. According to the phylogenetic relationship, s can be classified into 13 major groups. Sixteen genes were differentially expressed between genotypes of Ma46 (low coumarin content) and Ma49 (high coumarin content), suggesting that these genes are likely involved in coumarin biosynthesis. About 73.55% and 66.67% of the genes were differentially expressed under ABA or abiotic stress in the shoots and roots, respectively. Furthermore, the functions of and , which were upregulated under stress and potentially involved in coumarin glycosylation, were characterized by heterologous expression in yeast and . These results extend our knowledge of the gene family along with gene functions, and provide valuable findings for future studies on developmental regulation and comprehensive data on genes in .