Germination inhibitors, seeds coumarin

Naturally occurring phenolic compounds such as catechol, resorcinol, pyro-gallol, salicylic, gallic, ferulic, caffeic, and coumaric acids all serve as germination inhibitors. Indeed, some of the selective herbicides such as the substituted phenols and cresols also serve as germination inhibitors. Because of the widespread occurrence of coumarin in plants and its demonstrated inhibitory effects at levels found in fruits and some seeds, it is considered to be a natural germination inhibitor (Lerner et al. 1959). In time, of course, coumarin is metabolized in resting seeds to a level below inhibition. 

Coumarins are lactones of o-hydroxycinnamic acids in which side chains often are isoprenoid (78). Coumarin, esculin, and psoralen (a furanocoumarin) all strongly inhibit seed germination. Such inhibitors are produced by a variety of legumes and cereal grains. 

Suppression of seed germination in plants Angelicin (4), psoralen (2) and coumarin Inhibitor of root and sprout formation in potato [1SS,146]... 

Coumarins Psoralen (D 22.2.2) Inhibitor of seed germination in Psoralea subacaulis... 

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