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PLANT PHYSIOLOGY , Vol 109, Issue 2 513-516, Copyright © 1995 by American Society of Plant Biologists

DEVELOPMENT AND GROWTH REGULATION

Identification of an N-Glucoside of cis-Zeatin from Potato Tuber Sprouts

B. Nicander, P. O. Bjorkman and E. Tillberg
Department of Plant Physiology, Swedish University of Agricultural Sciences, P.O. Box 7047, 750 07 Uppsala, Sweden

A compound was isolated from potato (Solanum tuberosum L. cv Bintje) tuber sprouts by immunoaffinity chromatography with antibodies against the cytokinins zeatin riboside and isopentenyladenosine. Analysis by ultraviolet spectroscopy and gas chromatography-mass spectrometry of derivatives identified the compound as a 9-glucoside of 6-[(Z)-4-hydroxy-3-methyl-2-butenylamino]purine (cis-zeatin). N-glucosides have often been reported as metabolites of other cytokinins, but to our knowledge, they have never before been found for cis-zeatin. The finding gives proof that cis-zeatin, a modified base in tRNA, also exists as a free substance in plants, since the glucoside, unlike other tRNA-free cis-zeatins described earlier by others, cannot arise by enzymatic degradation of tRNA during plant extraction.


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R. Joseph Neil Emery, L. Leport, J. Edith Barton, N. Clifford Turner, and C. Anthony Atkins
cis-Isomers of Cytokinins Predominate in Chickpea Seeds throughout Their Development
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R. C. Martin, M. C. Mok, J. E. Habben, and D. W. S. Mok
A maize cytokinin gene encoding an O-glucosyltransferase specific to cis-zeatin
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Copyright © 1995 by the American Society of Plant Biologists