Potential allelochemicals fromPistia stratiotes L.

Abstract
Among the substances isolated from ethyl ether extract of Pistia stratiotes L. , linoleic acid, γ -linolenic acid, (12R,9Z,13E,15Z) -l2-hydroxy- 9,13,15-octadecatrienoicacid, (9S,10E,12Z,15Z)-9-hydroxy-10,12,15-octadecatrienoic acid, α-asarone, and 24S-ethyl-4,22-cholestadiene-3,6-dione were found to inhibit the growth of some microalgae in solid medium. Toxicity of α-asarone on the growth of sensitive algal strains in liquid medium is discussed.