关键词: 大菊[Dendranthema morifolium （Ramat.） Tzvelev], 丁酰肼, 株高, 观赏性状

Abstract: Fourteen ornamental chrysanthemums[Dendranthema morifolium （Ramat.） Tzvelev] sensitive to photoperiod were used to study the effects of different concentrations of daminozide and spraying time on their ornamental characters. The results show that different concentrations of daminozide had a greater effect on the plant height of the same variety, and the same concentration of daminozide had a smaller effect on the plant height of three types of chrysanthemum varieties with fast rooting, medium rooting and slow rooting. With the increase of concentration treated for every 7 days, the inhibition of plant height growth of chrysanthemum was more obvious. The plant height of chrysanthemum was better sprayed at the same concentration for every 10 days. For most varieties, 3 g/L daminozide was the best concentration to control the plant height once every 10 days. Different concentrations of daminozide had obvious effects on flower diameter, leaf length, leaf width, internode length and stem diameter of chrysanthemum varieties. Daminozide could inhibit plant height. The treatment of 3 g/L daminozide every 10 days had the best effect on the height of chrysanthemum.

Key words: chrysanthemum[Dendranthema morifolium （Ramat.） Tzvelev], butylhydrazine, plant height, ornamental characters