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The effect of costunolide was concentration-dependent and within the range of its natural micromolar occurrence in roots. We assume that an STL gradient is responsible for the stronger inhibition of elongation growth on the host-facing flank of the germ tube compared with the far side flank. This would confer a double role of STLs from sunflower root exudates in the sunflower-broomrape interaction, namely, as germination stimulants and as chemotropic signals.Pectin is a major cell wall component that plays important roles in plant deve