The role of auxin level and sensitivity in floral induction |
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Authors: | Th Gaspar C Penel Claudine Roduit C Moncousin H Greppin |
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Institution: | (1) Laboratoire de Physiologie végétale, Université de Genève, 3, place de l’Université, CH-1211 Genève 4, Switzerland;(2) Ecole d’Ingénieurs horticoles E.T.S., CH-1254 Lullier, Switzerland |
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Abstract: | Flower initiation takes place during a rise of peroxidase activity following a peak of minimum activity which marked the completion
of the flowering inductive phase. Since basic isoperoxidases underwent an inverse variation of activity in the course of successive
inductive and initiative phases, it was hypothesized that the induction of flowering led to a temporary peak of maximum auxin
level in the leaves. Our analyses and available literature data support the view. They also show the different capacity of
non-induced and induced material to respond to external auxin application. Since some aspects of the physiological state characterizing
induced plants can be simultaneously obtained in all plant parts as a result of rapid interorgan communication, the classical
florigen theory is seriously challenged.
On leave from University of Liège-Start Tilman, Institute of Botany B22, B-4000 Liège, Belgium. |
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