Highlights
Kynurenine metabolites are detected and accumulate in H. perforatum tissue culture.
IAA increases accumulation of KYN and 3-HAA in shoots.
Exogenous KYN promotes KYNA accumulation.
Pharmacological inhibition alters kynurenine pathway metabolite profiles in a tissue-specific manner.
Kynurenine and IAA differentially regulate root development.
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