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Gibberellins and the floral transition in Sinapis alba

Authors

  • Laurent Corbesier,

    Corresponding author
    1. Department of Life Sciences, Laboratory of Plant Physiology, Institute of Botany, University of Liège, B22 Sart Tilman, B-4000 Liège, Belgium
    2. Current address: Max-Planck-Institute for Plant Breeding Research, Carl-von-Linné Weg 10, D-50829 Köln, Germany
    3. These authors contributed equally to the work.
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  • Gaelle Kustermans,

    1. Department of Life Sciences, Laboratory of Plant Physiology, Institute of Botany, University of Liège, B22 Sart Tilman, B-4000 Liège, Belgium
    2. These authors contributed equally to the work.
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  • Claire Périlleux,

    1. Department of Life Sciences, Laboratory of Plant Physiology, Institute of Botany, University of Liège, B22 Sart Tilman, B-4000 Liège, Belgium
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  • Siegbert Melzer,

    1. Department of Life Sciences, Laboratory of Plant Physiology, Institute of Botany, University of Liège, B22 Sart Tilman, B-4000 Liège, Belgium
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  • Thomas Moritz,

    1. Umea Plant Science Centre, Department of Forest Genetics and Plant Physiology, The Swedish University of Agricultural Sciences, SE-901 83 Umea, Sweden
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  • Andrée Havelange,

    1. Department of Life Sciences, Laboratory of Plant Physiology, Institute of Botany, University of Liège, B22 Sart Tilman, B-4000 Liège, Belgium
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  • Georges Bernier

    1. Department of Life Sciences, Laboratory of Plant Physiology, Institute of Botany, University of Liège, B22 Sart Tilman, B-4000 Liège, Belgium
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  • Edited by J. Reid

* e-mail: corbesie@mpiz-koeln.mpg.de

Abstract

The putative role of gibberellins in the transition to flowering was investigated in Sinapis alba, a caulescent long-day (LD) plant. It was observed that: (1) physiological doses of exogenous gibberellins (GA1, GA3, GA9) do not cause the floral shift of the meristem when applied to plants grown in short days but have some positive effect on the flowering response to a suboptimal LD; no inhibition was observed in any case; (2) GA-biosynthesis inhibitors (prohexadione-Ca and paclobutrazol) considerably inhibit stem growth but have some negative effect on flowering only when a suboptimal LD is given; and (3) the floral transition induced by one 22-h LD does not correlate with any detectable change in GA content of the apical bud, of the leaves, and of the phloem exudate reaching the apex. Taken together, these results suggest that GAs do not act as a major signal for photoperiodic flower induction in Sinapis.

Ancillary