[en] Understanding the complete picture of floral transition is still impaired by the fact that physiological studies mainly concern plant species whose genetics is poorly known, and vice versa. Arabidopsis thaliana has been successfully used to unravel signalling pathways by genetic and molecular approaches, but analyses are still required to determine the physiological signals involved in the control of floral transition. In this work, the putative role of cytokinins was investigated using vegetative plants of Arabidopsis (Columbia) induced to flower synchronously by a single 22 h long day. Cytokinins were analysed in leaf extracts, leaf phloem exudate and in the shoot apical meristem at different times during floral transition. It was found that, in both the leaf tissues and leaf exudate, isopentenyladenine forms of cytokinins increased from 16 h after the start of the long day. At 30 h, the shoot apical meristem of induced plants contained more isopentenyladenine and zeatin than vegetative controls. These cytokinin increases correlate well with the early events of floral transition.
Corbesier, Laurent; Université de Liège - ULiège > Département des sciences de la vie > Physiologie végétale
Prinsen, Els; Universiteit Antwerpen - UA > Department of Biology > Laboratory for Plant Biochemistry and Physiology
Jacqmard, Annie ; Université de Liège - ULiège > Département des sciences de la vie > Physiologie végétale
Lejeune, Pierre ; Université de Liège - ULiège > Département des sciences de la vie > Physiologie végétale
Van Onckelen, Harry; Universiteit Antwerpen - UA > Department of Biology > Laboratory for Plant Biochemistry and Physiology
Périlleux, Claire ; Université de Liège - ULiège > Département des sciences de la vie > Physiologie végétale
Bernier, Georges ; Université de Liège - ULiège > Département des sciences de la vie > Physiologie végétale
Language :
English
Title :
Cytokinin levels in leaves, leaf exudate and shoot apical meristem of Arabidopsis thaliana during floral transition
Publication date :
2003
Journal title :
Journal of Experimental Botany
ISSN :
0022-0957
eISSN :
1460-2431
Publisher :
Oxford Univ Press, Oxford, United Kingdom
Volume :
54
Issue :
392
Pages :
2511-2517
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Interuniversity Attraction Poles Programme P4/15
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] BELSPO - Politique scientifique fédérale [BE] ULiège FSR - Université de Liège. Fonds spéciaux pour la recherche [BE]
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