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Differential metabolites between tuberous roots from cultivated variety (ZP) and wild variety (YS) of  Rehmannia glutinosa  were analyzed by widely targeted metabolomics, and annotated to KEGG pathways. 228 secondary metabolites (SM) in ZP and YS were detected, of which 58 were differential metabolites (DM), including 41 flavonoids, 10 phenolic acids, 3 terpenoids, 2 alkaloids and 2 others, and 170 were unchanged; Among 58 DMs, 44 (75.9%) were up-regulated in YS, of which 30 were unique to YS, while 14 (24.1%) were down-regulated in YS, of which 10 were unique to ZP; Among flavonoids, 33 (80.5%) were more highly expressed in YS than in ZP; Among phenolic acids, 7 (70%) were more highly expressed in YS than in ZP; 12 of 58 DMs were annotated into 17 types of KEGG pathways. Among them, benzoic acid and p-Coumaryl alcohol were up-regulated in YS, and annotated into 10 pathways (58.8%) and 4 pathways (23.5%), respectively. In addition, much of DMs possess various pharmacological effects. These results indicated better quality of YS than ZP and the necessity of YS domestication. Taken together, this study will provide a reference for the scientific introduction, comprehensive development and utilization of wild  Rehmannia glutinosa .

Comparative analysis of tuberous root metabolites between cultivated and wild varieties of Rehmannia glutinosa by widely targeted metabolomics