Abstract
About 17 years ago, when Okamoto et al. had been studying azaindene compounds [1] (e.g., 8-benzylamino-2-methyl-s-triazolo[l,5-a]pyridine, 4(7)-benzylaminobenzimidazole, etc.) which have no purine ring yet have apparently analogous chemical structure to N6-benzyladenine (BA) or kinetin (K), it was suspected that they might have antagonistic effect on BA or K in the tobacco bioassay. But the result was that they showed cytokinin activity and gave ca 4 g of fr. wt of callus at 10 ppm, while BA and K gave similar callus yield at 0.01 ppm in the same bioassay. We were also interested in 1,3-diphenylurea (DPU). Because there were many papers reporting the cytokinin activity of DPU [1, 2], but perhaps owing to the difference of bioassay methods and also possibly its low solubility in H2O, the results differed one from the other and it was generally concluded that its cytokinin activity is low and sporadic. We intended to clarify this confusion, and tested DPU in the tobacco bioassay many times carefully and concluded that DPU has a definite cytokinin activity, giving ca 4 g of callus at 10 ppm [1].
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References
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© 1981 Springer-Verlag, Berlin Heidelberg
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Isogai, Y. (1981). Cytokinin Activities of N-Phenyl-N’-(4-Pyridyl)ureas. In: Guern, J., Péaud-Lenoël, C. (eds) Metabolism and Molecular Activities of Cytokinins. Proceedings in Life Sciences. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-68035-9_11
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DOI: https://doi.org/10.1007/978-3-642-68035-9_11
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