Gibberellins and the floral transition in Sinapis alba |
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| Authors: | Laurent Corbesier Gaelle Kustermans Claire Périlleux Siegbert Melzer Thomas Moritz rée Havelange Georges Bernier |
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| Institution: | Department of Life Sciences, Laboratory of Plant Physiology, Institute of Botany, University of Liège, B22 Sart Tilman, B-4000 Liège, Belgium; Umea Plant Science Centre, Department of Forest Genetics and Plant Physiology, The Swedish University of Agricultural Sciences, SE-901 83 Umea, Sweden; Current address: Max-Planck-Institute for Plant Breeding Research, Carl-von-LinnéWeg 10, D-50829 Köln, Germany; These authors contributed equally to the work. |
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| 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 . |
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