Isolation and identification of piceatannol as a phytoalexin from sugarcane

Piceatannol was isolated from sugarcane (Saccharum sp.) infected with Colletotrichum falcatum but not from healthy or wounded sugarcane, or C. falcatum itself. The compound inhibited both spore germination and germ tube growth of C. falcatum. This is the first report of a stilbene phytoalexin in the Poaceae.