Fig. 1

Soybean isoflavonoid biosynthetic pathway. Inducible phytoalexins (highlighted in blue) and constitutively biosynthesized isoflavone conjugates (highlighted in black) are derived from the isoflavone intermediates daidzein or genistein. CHS chalcone synthase, CHR chalcone reductase, CHI chalcone isomerase, IFS isoflavone synthase, G2’DT genistein 2′-dimethylallyl transferase, I2’H isoflavone 2′-hydroxylase, G4DT glycinol 4-dimethylallyl transferase, G2DT glycinol 2-dimethylallyl transferase, GLS glyceollin synthase