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Plant Physiology 59:478-483 (1977)
© 1977 American Society of Plant Biologists

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Articles

Cytokinins: Metabolism and Biological Activity of N6-({Delta}2-Isopentenyl)adenosine and N6-({Delta}2-Isopentenyl)adenine in Tobacco Cells and Callus 1

Michel Laloue, Claude Terrine and Jean Guern

a Université Pierre et Marie Curie, Service des Hormones Végétales, T.53.43.E.3., 75230 Paris Cedex 05

The cytokinin, N6-({Delta}2-isopentenyl)adenine, is found to be at least 3.3 times as active as N6-({Delta}2-isopentenyl)adenosine in promoting the growth of cytokinin-requiring tobacco (Nicotiana tabacum) callus. Absorption rates of N6-({Delta}2-isopentenyl)adenine and N6-({Delta}2-isopentenyl)adenosine by tobacco cells in liquid suspension do not differ significantly. In these cells, N6-({Delta}2-isopentenyl)adenosine-5'-monophosphate, di-, and triphosphate are synthesized in both cases, but 7-glucosylation occurs significantly only with N6-({Delta}2-isopentenyl)adenine, protecting thereby its N6-isopentenyl side chain from cleavage. Degradation by N6-side chain removal appears to be intense, leading to the formation of adenine, adenosine, and adenylic nucleotides. Thus, it is suggested that N6-({Delta}2-isopentenyl)adenine-7-glucoside is a protected or storage form of the cytokinin which could account for the higher biological activity of N6-({Delta}2-isopentenyl)adenine than of N6-({Delta}2-isopentenyl)adenosine.

1 This research was partly supported by Centre National de la Recherche Scientifique, Equipe de recherche associée N 486






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1977 by the American Society of Plant Biologists