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- W142943071 abstract "Abstract Previous evidence that anthocyanin formation in Spirodela is dependent on the synthesis of a complex nucleotide or nucleic acid has been extended through a survey of the effects of a variety of purine and pyrimidine analogs. Almost all such compounds have been found to inhibit anthocyanin formation. The group includes analogs of all four bases which make up ribonucleic acid (RNA): 8-azaguanine, 8-azaadenine, 6-azauracil, and 2-thiocytosine, as well as Antrycide (2,6′-dimethyl-6,4′-pyrimidylamino-4, 2′-diaminoquinoline 1,1′-dimethosulfate), an inhibitor of purine incorporation into nucleic acid. The most effective inhibitor is still, as previously reported, 8-azaguanine. It decreases the anthocyanin formation by 50% at 3 × 10 −7 M . Subinhibitory concentrations of azaguanine, azaadenine and Antrycide, but not in general of the natural bases, clearly promote pigment formation. The inhibitions are reversed in each case by the corresponding purine or pyrimidine, or its riboside or ribotide. There is a specific requirement for a purine, not satisfiable by pyrimidines, and conversely a requirement for a pyrimidine, not wholly satisfied by purines. There is indication of a requirement for both uracil and cytosine. Experiments using simultaneously two types of inhibitors, namely, analogs of both purines and pyrimidines, confirm that both purine and pyrimidine cooperate in the synthesis of anthocyanin. It has been demonstrated that the reversing compounds function within the plant, rather than by preventing the absorption of the antagonist. It is concluded that an unstable nucleic acid, which must be continually resynthesized, is the catalyst or limiting factor in the synthesis of anthocyanin in Spirodela ." @default.
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- W142943071 date "1962-02-01" @default.
- W142943071 modified "2023-09-23" @default.
- W142943071 title "The biogenesis of anthocyanins" @default.
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- W142943071 doi "https://doi.org/10.1016/0003-9861(62)90409-5" @default.
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