Abstract
The production of phenylalanine ammonia-lyase and flavonoids in illuminated strawberry leaf disks was dependent on a supply of carbon dioxide, while in darkness carbon dioxide had no effect on the small rates of production. An external supply of sucrose could remove the carbon dioxide dependency of flavonoid and phenylalanine ammonia-lyase production and a supply of carbon dioxide could remove the stimulation of phenylalanione ammonia-lyase and flavonoid production brought about by external sucrose. The uptake and metabolism of external sucrose by leaf disks was stimulated by light and the light-stimulated uptake was inhibited by DCMU. The synthesis of flavonoids and phenylalanine ammonia-lyase were inhibited by DCMU probably through its inhibition of CO 2 fixation or sucrose uptake. Photosynthesis and carbohydrate metabolism were found to be of extreme importance in controlling the synthesis of flavonoids in leaf disks.
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