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Structures of phenolic plant signal molecules known to activate the syrB gene involved in syringomycin biosynthesis by P. syringae pv. syringae. Arbutin is found in several plant species including pear (Pyrus communis L.). The flavonol glycosides (quercetin 3-rutinosyl-4′-glucoside and kaempferol 3-rutinosyl-4′-glucoside) and the flavanone glucoside (dihydrowogonin 7-glucoside) are abundant in the leaves of sweet cherry (Prunus avium L.).
