Foster K W, Lipson E D
J Gen Physiol. 1973 Nov;62(5):590-617. doi: 10.1085/jgp.62.5.590.
With the help of an automated tracking system we have studied the characteristics of the transient light growth response of Phycomyces. The response shows a sharply defined latency. The Q(10) of the reciprocal latency is 2.4. Response patterns at different peaks of the action spectrum are the same. The gradual variation of response magnitude over a wide range of adapted intensifies parallels that of phototropism. The responses to saturating stimuli exhibit a strong oscillation with a constant period of 1.6 min and variable damping. The growth responses to sinusoidally varying light intensities show a system bandwidth of 2.5 x 10(-3) Hz. The linear dependence of phase shift on frequency is largely attributable to the latency observed with pulse stimuli. In the high intensity range a previously suspected increase of the steady-state growth rate with intensity has been confirmed. The light growth responses of mutants selected for diminished phototropism have been investigated. Many of these mutants have sizable but grossly distorted growth responses.
借助自动跟踪系统，我们研究了毛霉的瞬时光生长反应特性。该反应具有明确的潜伏期。潜伏期倒数的Q(10)为2.4。在作用光谱的不同峰值处，反应模式相同。在广泛的适应强度范围内，反应幅度的逐渐变化与向光性相似。对饱和刺激的反应呈现出强烈的振荡，周期恒定为1.6分钟，阻尼可变。对正弦变化光强度的生长反应显示系统带宽为2.5×10⁻³赫兹。相移对频率的线性依赖性很大程度上归因于脉冲刺激时观察到的潜伏期。在高强度范围内，先前怀疑的稳态生长速率随强度增加已得到证实。对因向光性减弱而选择的突变体的光生长反应进行了研究。许多这些突变体具有相当大但严重扭曲的生长反应。
