Department of Biology, Princeton University, Princeton, New Jersey 08540.
Plant Physiol. 1969 Jul;44(7):973-7. doi: 10.1104/pp.44.7.973.
Studies were made of the effects of blue, green, red and far-red (FR) light on the circadian rhythm of leaf movement of Coleus blumei x C. frederici, a short day plant. Under continuous illumination with blue light, there was a significant lengthening of the period of the rhythm to about 24.0 hr, as compared to 22.5 hr in continuous darkness. Under continuous red light, the period length was significantly shortened to 20.5 hr. Under continuous green or FR, the period length was not significantly different from the dark control. It was observed that under continuous FR illumination, the leaves tended to oscillate in a more downward position. Eight-hr red light signals were effective in advancing the phase of the rhythm as compared to a control under continuous green light. Blue light signals were effective in delaying the phase of the rhythm. FR light signals were ineffective in producing either delay or advance phase shifts. Far-red light did not reverse the effects of either red or blue light signals. On the basis of these results it is suggested, that pigments which absorb blue or red light, rather than phytochrome, mediate the effect of light on the circadian rhythm of leaf movement.
研究了蓝光、绿光、红光和远红光（FR）对短日植物彩叶草（Coleus blumei x C. frederici）叶片运动的昼夜节律的影响。在连续蓝光照射下，与连续黑暗条件下的 22.5 小时相比，节律周期显著延长至约 24.0 小时。在连续红光照射下，周期长度显著缩短至 20.5 小时。在连续绿光或 FR 下，周期长度与黑暗对照无显著差异。观察到在连续 FR 光照下，叶片倾向于在更向下的位置振荡。与连续绿光下的对照相比，8 小时的红光信号有效地提前了节律的相位。蓝光信号可延迟节律的相位。FR 光信号在产生延迟或提前相位移动方面均无效。远红光不能逆转红光或蓝光信号的作用。基于这些结果，建议吸收蓝光或红光的色素而不是光敏色素介导光对叶片运动的昼夜节律的影响。
