Action Of Coumarin Research Articles

A FUNGISTATIC ACTION OF COUMARIN.

VAN SUMERE et al. showed that coumarin affects the germination of wheat stem rust uredospores1, and Bellis showed2 that Penicillium jenseni and P. nigricans are able to grow on a modified Czapek's nutrient medium containing coumarin as the only one carbon source. So far as I am aware, no other experiments have been done to examine the ability of coumarin to regulate the growth of moulds*, in spite of the fact that some fungi normally produce coumarin precursors and derivatives3, and the level of coumarin-like substances increases in the fungus-attacked cell4.

The Nature of the Growth‐Promoting Action of Coumarin

The Nature of the Growth‐Promoting Action of Coumarin

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.