Gallocatechin biosynthesis via a flavonoid 3 ',5 '-hydroxylase is a defense response in Norway spruce against infection by the bark for beetle-associated sap-staining fungus Endoconidiophora polonica

摘要

One of the best-studied defense responses to fungal infection in Norway spruce (Picea abies) is the biosynthesis of fiavan-3-ols, which accumulate as monomers or polymers known as proanthocyanidins. The individual flavan-3-ol units consist of compounds with a 3',4'-dihydroxylated B ring [2,3-(trans)-(+)-catechin or 2,3-(cis)-(-)-epicatechin] and compounds with a 3',4',5'-trihydroxylated B ring [2,3 (trans)-(+)-gallocatechin or 2,3-(cis)-(-)-epigallocatechin].