Partanen Jouni, Koski Veikko, Hänninen Heikki
Finnish Forest Research Institute, Punkaharju Research Station, FIN-58450 Punkaharju, Finland.
Tree Physiol. 1998 Dec;18(12):811-816. doi: 10.1093/treephys/18.12.811.
We examined the effects of several photoperiod and temperature regimes imposed during the winter-spring period on the timing of bud burst in rooted cuttings of Norway spruce (Picea abies (L.) Karst.) grown in a greenhouse in Finland. The treatments were initiated in November and December after the cuttings had been exposed to natural chilling and freezing events. Irrespective of the treatments applied, time to bud burst decreased with increased duration of previous exposure to natural chilling and freezing events. Fluctuating day/night temperatures and continuous lengthening of the photoperiod hastened bud burst. Shortening the photoperiod delayed bud burst, suggesting that little or no ontogenetic development toward bud burst takes place during mild periods before the winter solstice. In the case of climatic warming, this phenomenon may prevent the premature onset of growth that has been predicted by computer simulations with models that only consider temperature regulation of bud burst.
我们研究了冬春季节期间施加的几种光周期和温度条件对芬兰温室中生长的挪威云杉（Picea abies (L.) Karst.）扦插苗芽萌发时间的影响。这些处理在插条经历自然低温和冰冻事件后于11月和12月开始。无论采用何种处理，随着先前暴露于自然低温和冰冻事件的持续时间增加，芽萌发时间缩短。昼夜温度波动和光周期持续延长会加速芽萌发。缩短光周期会延迟芽萌发，这表明在冬至前的温和时期，芽萌发的个体发育很少或没有发生。在气候变暖的情况下，这种现象可能会阻止计算机模拟仅考虑芽萌发温度调节的模型所预测的生长过早开始。
