Add time:07/16/2019         Source:sciencedirect.com

The cytokinin activities of adenosine 3′,5′-monophosphate, N6,O2″-dibutyryladenosine 3′,5−'monophosphate, 8-bromoadenosine 3′,5′-monophosphate, N6-(Δ2-isopentenyl)adenosine 3′,5′-monophosphate, and N6-benzyladenosine 3′,5′-monophosphate were determined in the tobacco bioassay and compared with the activities of the corresponding non-cyclic nucleotides, nucleosides and bases of the N6-isopentenyl-substituted, N6-benzyl-substituted, 8-bromo-substituted, and unsubstituted adenine series. In each of these series the cytokinin activities in decreasing order were: bases ⪢ nucleosides ⪖ nucleotides > cyclic nucleotides. All members of the N6-isopentenyl- substituted and N6-benzyl-substituted series were highly active cytokinins, reaching maximum activity at concentrations of 1 μM or less, whereas, as expected, all members of the unmodified adenine series were inactive in the tested concentration ranges of up to 180 and 200 μM for adenosine and adenine, and 40 μM for the adenine nucleotides. Members of the 8-bromo-substituted adenine series were much weaker cytokinins than the N6-substituted adenine derivatives but showed activity in the same sequence starting at a concentration of about 5 μM. Thus, in the cases of 8-bromoadenosine 3′,5′-monophosphate and N6,O2′-dibutyryl-adenosine 3′,5′-monophosphate, both of which have been reported to promote cell division and growth of plant tissues, the cytokinin activity is related to the 8-bromo substituent and to the N6-butyryl substituent, respectively, rather than to the 3′,5′-cyclic monophosphate moiety.

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