The effects of methyl jasmonate (MJ) or salicylic acid (SA) on the sesquiterpene lactone content and biomass accumulation were investigated in a hairy root culture of Cichorium intybus. The guaianolides crepidiaside B (1), 8-deoxylactucin (2), and the germacranolide sonchuside A (3) were quantified by RP-HPLC. Neither MJ nor SA affected the growth of examined hairy root culture. Jasmonate up-regulated biosynthesis of the analysed sesqiterpene lactones in the culture (maximum after 72 h). SA caused a transient increase in sonchuside A accumulation in the roots (up to twofold increase compared with the control) and decrease of guaianolide content.
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