Journal ArticleDOI
The Structure and Synthesis of Cytokinin Metabolites. 1. The 7- and 9-β-D-Glucofuranosides and Pyranosides of Zeatin and 6-Benzylaminopurine
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TLDR
The structures of the major stable plant metabolites of the cytokinins zeatin and 6-benzylaminopurine have been confirmed by synthesis to be 7- and 9-β-D-glucopyranosides.Abstract:
The structures of the major stable plant metabolites of the cytokinins zeatin and 6-benzylaminopurine have been confirmed by synthesis to be 7- and 9-β-D-glucopyranosides. The small quantities of metabolites initially isolated (< 100 μg) precluded assignment of the glucose ring size or configuration of the anomeric linkage so that synthesis of both the furanose and pyranose forms of 7-β-D- and 9-β-D-glucosylzeatin and 6-benzylaminopurine was undertaken which allowed direct u.v., m.s. and t.l.c. comparison with the metabolites. Numerous synthetic routes to the unusual 7-glucosides of the two cytokinins were explored, the most successful utilizing a one-pot pyrimidine ring closure of an imidazole derivative to afford directly in high yield the required 7-glucosides of zeatin and 6-benzylaminopurine.read more
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Journal ArticleDOI
The Biosynthesis and Metabolism of Cytokinins
and D S Letham,Lok Man S. Palni +1 more
Journal ArticleDOI
N-glucosylation of cytokinins by glycosyltransferases of Arabidopsis thaliana.
TL;DR: Constitutive overexpression of UGT76C1 in transgenic Arabidopsis confirmed that the recombinant enzyme functioned in vivo to glucosylate cytokinin applied to the plant and the biochemical characteristics of the N-glucosyltransferases were analyzed, and highly effective inhibitors of their activities were identified.
Journal ArticleDOI
Regulators of cell division in plant tissues : XXV. Metabolism of zeatin by lupin seedlings.
TL;DR: In this article, the radioactivity in the xylem sap of intact seedlings, supplied with [(3)H]zeatin via the roots, was largely due to Zeatin, dihydrozeatin and zeatin riboside.
Journal ArticleDOI
Cytokinin metabolism : implications for regulation of plant growth and development
TL;DR: It is highlighted how plant development is influenced by cytokinin synthesis, conjugation and conjugate hydrolysis, and what has been learned of the enzymes that regulate these processes, and progress in identifying their functional counterparts in plants.