Papilionoideae isoflavonoids

Plant defense Papilionoideae Isoflavonoid phytoalexins (e.g., pterocarpans, isoflavans) Antifungal activity (inhibit spore germination, germ tube elongation, hyphal growth, etc.)... 

Most known P. have been discovered in the subfamily Papilionoideae of the Leguminoseae, followed by the Solanaceae, while many examples are known from other families P. do not belong structurally or biosynthetically to any one class of compounds. Many are isoflavonoids and several of these are pter-ocarpans, e.g. pisatin (see Pterocarpans), Phaseolin (see), Glyceollins (see). There are also terpenes (see Hg.2 see Ipomoeamarone), acetylenic compounds (see Safynol, Wyerone acid), a-hydroxydihydrochal-cones, stilbenes and polyketides (Fig. 1). 

Isol. from Baptisa spp., Bolusanthus speciosus, Cytisus scoparius, Lathyrus spp. and Thermopsis spp. (Leguminosae, Papilionoideae). Also prod, by microorganisms Aspergillis niger, Fusarium, Stemphylium and Streptomyces spp. Pale-yellow cryst. (AcOH). Mp 212°. All isolations of isoflavonoids from microorganisms are considered doubtful. 

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