Department of Biology, Vanderbilt University, Nashville, Tennessee 37235.
Plant Physiol. 1991 Nov;97(3):1122-9. doi: 10.1104/pp.97.3.1122.
The action spectrum for resetting the phase of the circadian clock in Chlamydomonas reinhardtii is different depending upon whether the light stimuli are presented to cells that were in darkness versus dim illumination before stimulation. In this report, we show that phase resetting of illuminated cells appears to be mediated by components of the photosynthetic apparatus. This conclusion is based upon the action spectrum for phase-shifting illuminated cells (which looks like that for photosynthesis) and upon the fact that inhibitors of photosynthetic electron transport also inhibit the light-induced phase shift of illuminated cells. Both of these characteristics differ from that of cells taken from darkness. We, therefore, believe that at least two resetting pathways for this circadian clock exist and that both of these pathways are ecologically significant.
在莱茵衣藻中重置生物钟相位的作用光谱取决于光刺激是施加在黑暗中的细胞还是在刺激前处于昏暗光照下的细胞。在本报告中，我们表明，受光照细胞的相位重设似乎是由光合作用装置的组件介导的。这一结论基于受光照细胞的移相作用光谱（类似于光合作用的作用光谱）以及光合作用电子传递抑制剂也抑制受光照细胞的光诱导相移这一事实。这两个特征都与取自黑暗中的细胞不同。因此，我们认为至少存在两种用于此生物钟的重置途径，并且这两种途径都具有生态意义。
