ACCUMULATION OF FLAVONOIDS IN SOYBEAN UNDER EFFECTS OF CYANOBACTERIAL CRUDE EXTRACT AND APHID INFESTATION
Keywords:flavonoids, cyanobacteria, soybean “Nam Dan”, cowpea aphid.
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. Those bioactive
substances were suppressed by the single treatment of N. calcicola crude extract, however, were
enhanced by the cross-talk interactions of N. calcicola HN9-1a and A. craccivora. Flavonoids in
the double factors-effected soybean leaves were remarkably increased to high level since 24
hours after cowpea aphid attack, having by 2.99 - 3.06-fold higher than that in control. It was the
important evidences to suggest that flavonoids may function in the defense mechanism of
soybean “Nam Dan” against A. craccivora; and N. cacicola HN9-1a crude extract improved the
accumulation of flavonoids in soybean response to cowpea aphid infestation.
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