Abstract
Enzymatic extract from Petunia leaves catalyze different reactions involved in the synthesis of hydroxycinnamoyl esters and flavonoids. Attempts to localize the individual enzymes within isolated chloroplasts show that these organelles: contain hydroxycinnamoyl-CoA—quinate—hydroxycinnamoyl transferase and flovanone-synthetase involved respectively in the biosynthesis of chlorogenic acid and naringenin; catalyze the isomerisation of chalcone to flavanone; are not able to activate the C 6—C 3 units to their CoA esters. These results are confirmed by feeding experiments on isolated chloroplasts using quinate or acetate 14C in combination (or not) with exogenously supplied “cinnamoyl-CoA”. These data seem to indicate that the activated cinnamic units, involved in the formation of chloroplastic phenols, are synthetized in other cellular compartment(s).
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