Chalcone synthase (CHS) is a key enzyme of the
flavonoid/isoflavonoid biosynthesis pathway. Besides being part of
the plant developmental program the CHS gene expression is induced
in plants under stress conditions such as UV light, bacterial or
fungal infection. CHS expression causes accumulation of flavonoid
and isoflavonoid phytoalexins and is involved in the salicylic acid
defense pathway.
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