Flavonoids repellent activity

The mechanism of repulsion or negative chemotaxis in zoospores is not yet kiK)wn, but in bacteria Ix activities are mediated by the modification of common receptor and signal transduction pathways (29). Notably, while several isoflavones with structural similarity to daidzein functioned as chemoattractants for Ph, sojacy many related flavonoids had repellent activities (i9). The importance of flavonoids in the case of Ph. sojae, and estrogenic substances in the case of A. cochlioides, in deterring infection of nonhost plants, certainly warrants additional investigation. 

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