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Sanguinarine is currently widely used to replace antibiotic growth promoters in animal feeding and has demonstrated useful anticancer activity. Currently, the main source of sanguinarine is from an important medicinal plant,  Macleaya cordata . To obtain a new source of sanguinarine production, we established hairy root cultures of  M .  cordata  by co-cultivating leaf and stem explants with  Agrobacterium rhizogenes . Except the co-cultivation medium, all growth media contained 200 mg/L timentin to eliminate  A .  rhizogenes . Through comparing the metabolic profiles and gene expression of hairy roots and wild-type roots sampled at five time points, we found that the sanguinarine and dihydrosanguinarine contents of hairy roots were far higher than those of wild-type roots, and we revealed the molecular mechanism that causes these metabolites to increase. Consequently, this study demonstrated that the hairy root system has further potential for bioengineering and sustainable production of sanguinarine on a commercial scale. To the best of our knowledge, this is the first efficient protocol reported for the establishment of hairy root cultures in  M .  cordata  using  A .  rhizogenes .

Hairy root induction and benzylisoquinoline alkaloid production in Macleaya cordata