Department of Biology, Princeton University, Princeton, New Jersey 08540.
Plant Physiol. 1968 Dec;43(12):1887-93. doi: 10.1104/pp.43.12.1887.
The phase response curve for the circadian rhythm of leaf movement of Coleus blumei x C. frederici, a short day plant, is generally similar to those reported for other organisms. An increase in the duration of the light signal caused an increase in the extreme values of the phase response curve and shortened the time for transition from maximum delays to maximum advances. Experiments with 2 light signals showed that the overt rhythm of leaf movement represents the rhythm of the light sensitive oscillator even during the transient period that followed the first light signal. A temperature decrease of 7 degrees for 8 hr caused only a transient phase shift in the following 2 cycles but not in the steady state. The combination of such a temperature decrease and a light signal showed that only the overt rhythm of leaf movement was disturbed by the temperature decrease whereas the light sensitive oscillator was free running. A temperature decrease of 11 degrees for 10 hr caused a steady state phase shift and affected the light sensitive oscillator as well.
彩叶草和弗雷德里克氏彩叶草的叶片运动昼夜节律的位相反应曲线，与其他生物的位相反应曲线大致相似。光信号时间的延长，引起位相反应曲线极值的增加和由最大延迟向最大前进转变时间的缩短。用两个光信号的实验表明，叶片运动的明相节奏代表光敏感振荡器的节奏，即使在紧随第一个光信号之后的瞬变期中也是如此。8 小时温度下降 7°C 只引起随后两个周期的一个暂态的位相移动，而不在稳定期中。这种温度下降和光信号的联合作用表明，只是叶片运动的明相节奏受温度下降的扰乱，而光敏感振荡器仍在自由运行。10 小时温度下降 11°C 引起稳定期中的位相移动，而且也影响光敏感振荡器。
