The effect of drought stress on the expression of key genes involved in the biosynthesis of triterpenoid saponins in liquorice (Glycyrrhiza glabra)

Drought stress increased the amount of glycyrrhizin in the stolons of Glycyrrhiza glabra. The expression of sequalene synthase (SQS) and β-amyrin synthase (bAS) genes were increased under drought stress, whereas expression of cycloartenol synthase (CAS) was not changed.58