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.
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Nishijima, T., Katsura, N., Koshioka, M. et al. Effects of uniconazole and GA3 on cold-induced stem elongation and flowering of Raphanus sativus L.. Plant Growth Regulation 21, 207–214 (1997). https://doi.org/10.1023/A:1005806107254
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DOI: https://doi.org/10.1023/A:1005806107254