【摘要】 为探明泡桐顶芽枯死原因以及利用侧芽进行人工接干的理论基础 ,采用切枝水培法研究了毛白 33泡桐顶侧芽休眠发育的温度特性。结果表明 :①毛白 33泡桐的顶芽和侧芽 1不是因为早霜或寒冷冻害而死 ,可能是进化过程中采取的一种适应策略 ;②毛白 33泡桐侧芽 2、3、4发育成了冬休眠芽 ,能够抵御冬季寒冷而越冬 ,并利用冬季低温信号解除其休眠 ,使冬芽萌发可能温度范围向低温方向扩大 ;③毛白 33泡桐侧芽 2、3、4在春季可以同时萌发 ,但侧芽 3萌发率稍高些 ,而侧芽 5难于萌发 ;④在 2 5℃下上部侧芽的萌发一定程度上抑制了下部侧芽的萌发 ,但 15℃下不存在上部侧芽萌发抑制下部侧芽萌发的现象。更多还原

【Abstract】 In order to probe the death reason of terminal buds and carry out trunk extension by using lateral buds, the temperature characteristics of dormancy development of terminal and lateral buds in Paulownia tomentosa×P. fortunei 33 were investigated by raising cutting branches on different date at 25℃ and 15℃. The results were as follows: ①The death reason of terminal buds and the first pair of lateral buds was possibly itself ecological adapting strategy, not the injury of early frost and freezing; ②The lateral buds 2,3 and 4 had obtained the feature of winter dormancy, and could survive from cold winter, and widen its possible temperature range of sprouting to lower temperature by experiencing winter chilling; ③The lateral buds 2,3 and 4 could sprout at the same time in spring, but it was difficult to sprout for other lateral buds; ④The sprouting of upper lateral buds could restrict the sprouting of lower lateral buds at 25℃, but not at 15℃.更多还原