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An auxin-like action of coumarin.

Coumarin, usually regarded as an inhibitor of growth processes in plants, markedly stimulated the elongation of excised segments of Helianthus hypocotyls. Substitution in the molecule of hydroxy-, methyl-, or chloro-groups, in the neighborhood of the unsaturated bond in the lactone ring, markedly altered the growth-promoting activity.

Coumarins↗