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Plant Physiology 65:1090-1095 (1980)
© 1980 American Society of Plant Biologists

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Articles

Kinetics of N6-({Delta}2-Isopentenyl)Adenosine Degradation in Tobacco Cells

EVIDENCE OF A REGULATORY MECHANISM UNDER THE CONTROL OF CYTOKININS

Claude Terrine and Michel Laloue

Centre National de la Recherche Scientifique, Service de Physiologie Cellulaire, 91190 Gif-Sur-Yvette, France, Laboratoire de Génétique et Physiologie du Développement des Plantes, Service de Physiologie Cellulaire, 91190 Gif-Sur-Yvette, France

Uptake and degradation of the cytokinin, N6-({Delta}2-isopentenyl) adenosine, were studied in tobacco cells grown as cell suspensions. Degradation occurs by cleavage of the isopentenyl chain which gives adenylic products. Rate of N6({Delta}2-isopentenyl)[8-14C]adenosine degradation increases several-fold after a 3- to 4-hour delay when cells have been exposed to a cytokinin. Consequently, only rates of N6-({Delta}2-isopentenyl)adenosine degradation measured during the first 3 hours of incubation with [8-14C]-N-6({Delta}2-isopentenyl)adenosine are representative of the intrinsic in vivo cytokinin degradative activity of tobacco cells. Within these limits, it appears that cytokinin degradative activity is high in cytokinin-autonomous tobacco cells, as indicated by the half life of the supplied N6({Delta}2 isopentenyl adenosine (about 3 hours) when it is supplied at the physiological concentration of 0.2 micromolar. This cytokinin degradative activity appears to be under the control of cytokinins themselves because N6-({Delta}2-isopentenyl)adenosine degradative activity is increased several-fold following a 3- to 4-hour delay after these cells have been exposed to a cytokinin.




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A. M. Rashotte, S. D.B. Carson, J. P.C. To, and J. J. Kieber
Expression Profiling of Cytokinin Action in Arabidopsis
Plant Physiology, August 1, 2003; 132(4): 1998 - 2011.
[Abstract] [Full Text] [PDF]


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Copyright © 1980 by the American Society of Plant Biologists