Influence of Light and Sucrose onN-Glucosyl Pyrazon Formation in Red Beet

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Abstract
The conversion of 5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone (pyrazon) toN-chloro-4-phenyl-3(2H)-pyridazinone glucosamine (hereinafter referred to asN-glucosyl pyrazon) in intact seedlings and in leaf discs of red beets (Beta vulgarisL., var. Detroit Dark Red) was significantly greater in the light than in the dark. Pyrazon conjugation with glucose was dependent on the carbohydrate status of the leaf tissue, since the formation of theN-glucoside in the dark was further reduced with dark pretreatment but could be restored to the level observed in the light by infiltrating the leaf discs with supplemental sucrose.