ISSN:
1573-5087
Keywords:
flowering
;
gibberellin
;
Raphanus sativus L.
;
stem elongation
;
uniconazole
;
vernalization
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract The effects of gibberellin (GA) on cold-induced stem elongation and flowering of Japanese radish (Raphanus sativus L.) were investigated using application of GA3 and a GA-biosynthesis inhibitor, uniconazole (UCZ). UCZ very strongly inhibited stem elongation and delayed flowering, and the inhibition and delay were completely reversed by GA3 application. These results suggest that GA is necessary not only in the stem elongation but also in the flowering. When cold treatment (CT) was conducted on the plants whose GA level was lowered by UCZ, GA3 applied after CT completely reversed the delay of flowering. Thus low GA level probably did not retard cold induction. Microscopic observation of apical meristem showed that UCZ delayed flowering by delaying the shift from vegetative to dome-shaped meristem. This result suggested that low GA level delayed floral evocation. Consequently it was suggested that low GA level retarded physiological process involved in long day induction or in floral evocation, resulting in delay of floral evocation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1005806107254
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