Institut de Physiologie Végétale, CNRS, 91190 Gif-sur-Yvette, France.
Plant Physiol. 1985 Nov;79(3):625-9. doi: 10.1104/pp.79.3.625.
Low temperature pulses have two effects on the circadian rhythm exhibited by stem extension rate of green Chenopodium rubrum plants. First, low temperature pulses have the same effect on the phasing of the rhythm as a dark period interrupting continuous light. Second, low temperature pulses stimulate stem extension rate during the 10 hours immediately following the end of the pulse. A difference in temperature between soil and air increases this effect. In any case, it is the change in temperature which is essential and not a specific temperature. Effects of light and temperature on phasing and amplitude of the rhythm explain why the maximal stem growth is observed under normal photo-thermoperiodic conditions, i.e. a high temperature during the photoperiod and a low temperature during the dark period.
低温脉冲对绿色藜茎伸长率表现出的昼夜节律有两种影响。首先，低温脉冲对节律的调相作用与中断连续光的暗期相同。其次，低温脉冲在脉冲结束后的 10 小时内刺激茎伸长率。土壤和空气之间的温差增加了这种效果。在任何情况下，起关键作用的是温度变化，而不是特定的温度。光和温度对节律的调相和幅度的影响解释了为什么在正常光温周期条件下观察到最大的茎生长，即在光周期期间高温和暗期期间低温。
