Promotion of flowering in Brassica campestris L. cv Ceres by sucrose [Bird rape, long-day plants]

Flower initiation of the quantitative long-day plant Brassica campestris cv Ceres was earlier and at a lower final leaf number when sucrose was added to the medium in which plants were grown in sterile culture. The optimal concentration of sucrose was 40 to 80 millimolar. This flower-promoting effec...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1984-08, Vol.75 (4), p.1085-1089
Main Authors: Friend, D.J.C, Bodson, M, Brenier, G
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
Ceres
Economic plant physiology
Flowering
Flowering, floral biology, reproduction patterns
Flowers
Flux density
Fundamental and applied biological sciences. Psychology
Germination and dormancy
Growth and development
Photons
Photoperiod
Photophase
Photosynthesis
Plant physiology and development
Plants
Vermiculite
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Summary:Flower initiation of the quantitative long-day plant Brassica campestris cv Ceres was earlier and at a lower final leaf number when sucrose was added to the medium in which plants were grown in sterile culture. The optimal concentration of sucrose was 40 to 80 millimolar. This flower-promoting effect of sucrose was not osmotic, as mannitol, sodium chloride, and polyethylene glycol were not effective at equal osmotic potentials. Seedlings grown heterotrophically after treatment with 4-chloro-5-(dimethylamino)-2-phenyl-3-(2H)-pyridazinone to prevent chlorophyll accumulation were also induced to form flower primordia earlier as the sucrose concentration in the medium was increased up to 80 millimolar. Inclusion of 4 millimolar sodium nitrate in the culture medium of green plants did not reduce the flower-promoting effects of sucrose but delayed initiation in plants grown without added sucrose. Removal of CO2 during a single main or supplementary light period, or both, greatly reduced flower initiation. It is concluded that sucrose may be an important controlling factor determining floral initiation in Brassica.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.75.4.1085