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ISHS Acta Horticulturae 515: XXV International Horticultural Congress, Part 5: Culture Techniques with Special Emphasis on Environmental Implications Chemical, Physical and Biological Means of Regulating Crop Growth in Ornamentals and Other Crops

INHIBITION OF FLOWER BUD FORMATION IN TSAI-HSIN WITH UNICONAZOLE AND GIBBERELLIN TREATMENTS

Authors:   N. Okuda, S. Dumrongkittikule, Y. Fujime
Keywords:   flowering, gibberellin, tsai-hsin, uniconazole
Abstract:
Effects of uniconazole and gibberellin application on inhibition and recovery of flowering in tsai-hsin (Brassica campestris L.) were investigated.

Seeds of two cultivars of ‘Chugoku-saishin’ and ‘Wasekei-saishin’ were sown in plastic pot (9cm diameter) on April 23 and August 27, 1997. The plants were grown in an unheated plastic house. After sowing the potted plants were divided into seven groups in each cultivar and one group was not applied with uniconazole and gibberellin. The plants of other six groups were applied with 10ml of 5 or 20 ppm uniconazole at 0, 1 or 2 weeks after sowing. In addition, the uniconazole applied plants were divided into two groups and one group was sprayed with 1.2ml of 100ppm gibberellin at 2 weeks after application of uniconazole.

In spring sowing, the budding and anthesis of uniconazole applied plants at 0 or 1 week after sowing occurred later than that of uniconazole applied plants at 2 weeks. The budding and anthesis of tsai-hsin plants had been inhibited with high concentration uniconazole application. The delay of budding and anthesis were recovered with gibberellin application. There was no significant difference in the floret number of terminal inflorescence without some treatments. The diameter of terminal inflorescence at anthesis tended to increase with gibberellin application. Elongation of flower stalk was inhibited with high concentration of uniconazole applied. In the autumn sowing, the node number slightly increased when plant was applied with uniconazole alone.

Elongation of stem and flower stalk was remarkably inhibited with uniconazole application.

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