Abstract
In Amaranthus tricolor seedlings, amaranthin synthesis can be induced by cytokinins and (or) by light. It was found that 5,6-dichloro-1-β-D-ribofuranosylbenzimidazole (DRB) was a specific inhibitor of the cytokinin response whereas the light response was unchanged. DRB also inhibited the negative response of pigment production to an anticytokinin, 7-(pentylamino)-3-methylpyrazolo(4,3-d) pyrimidine (PAMPP). DRB can be considered as a specific inhibitor of the physiological responses to cytokinins. The evolution of the inhibition percentage versus cytokinin or anticytokinin concentration shows that DRB is not a `competitor' of cytokinins. The experiments suggest that cytokinins or anticytokinins act as modulators of a fundamental light activated reaction of amaranthin synthesis.
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