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Narciclasine is a toxic alkaloid found in various Amaryllidaceae species. Narciclasine is a potential allelochemical and affects subcellular trafficking of auxin transporter proteins and actin cytoskeleton dynamics in Arabidopsis roots. Narciclasine inhibits the responses of Arabidopsis roots to auxin. Narciclasine modulates polar auxin transport in Arabidopsis roots.