Accumulation of flavonoids in soybean under effects of cyanobacterial crude extract and aphid infestation

The differential accumulation of endogenous flavonoids was recorded in soybean (G. max (L.) Merr. cv. “Nam Dan”) under infestation of cowpea aphid (Aphis craccivora Koch) and/or treatment of the crude extract of cyanobacterium strain Nostoc calcicola HN9-1a. During A. craccivora infestation, flavonoids in the aphid-infested leaves were strongly induced to high contents, which were 1.84–2.21 - fold higher than that observed in control.