Modifying the acylation of flavonols in Petunia hybrida

Treatment of petunia leaves with methyl esters of caffeic and ferulic acid resulted in major increases in the concentrations of naturally-occurring caffeoylated and feruloylated flavonol glycosides. Feeding with methyl coumarate resulted in the formation of a acylated flavonoid, with the bioisostere 4-fluorocinnamic acid forming the corresponding fluoroacylated derivative.