Circadian rhythms in behaviour and in the visual system of the blow fly, Calliphora vicina
Circadian rhythms in behaviour and in the visual system of the blow fly, Calliphora vicina
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DOI：
10.1016/s0022-1910(01)00062-2
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发表时间：
2001-07-15
影响因子：
2.2
通讯作者：
Cymborowski, B
中科院分区：
文献类型：
--
作者：
Pyza, E;Cymborowski, B
苍蝇在运动活动和视觉系统对光的敏感性方面表现出昼夜节律。在他们的视觉系统中，昼夜节律不仅在视网膜中被检测到，而且在第一个视神经丛（椎板）中也被检测到。在板层中，两类中间神经元，L1和L2，它们接收光感受器输入，在它们的板层轴突中表现出每日大小的变化。原则上，这两个昼夜节律，在苍蝇的行为和结构的变化，在叶片，都可以由同一个振荡器或不同的振荡器控制。为了检验这两种选择，我们研究了丽蝇的两种节奏。C.在光/暗（LD 12：12）和恒定黑暗（DD）中监测vicina。在此之后，每只苍蝇被固定，L1和L2的板层轴突的横截面积进行了检查，在白天和夜间的LD，并在苍蝇的活动和休息期间的DD。在LD中，L1和L2的轴突在白天比在夜间大，并且较大的尺寸与果蝇的活动相关。此外，表现出高活动水平的果蝇比不太活跃的果蝇有更大的细胞。然而，在DD中，两种昼夜节律都变得不同步。结果表明，两种昼夜节律之间的相关性，这在LD中同相运行，较大的细胞大小对应于苍蝇中较高的活动。然而，在DD中，它们独立运行，因此这些节奏可能是由不同的生物钟产生的。(C)2001爱思唯尔科技有限公司版权所有。
Flies exhibit circadian rhythms in their locomotor activity and in the sensitivity of the visual system to light. In their visual system, circadian rhythms have been detected not only in the retina but also in the first optic neuropile, the lamina. In the lamina two classes of interneuron, L1 and L2, which receive photoreceptor input, exhibit daily size changes in their lamina axons. In principle, these two circadian rhythms, in the fly's behaviour and in structural changes in the lamina, could both be controlled by the same oscillator or by different oscillators. To examine these two alternatives we have studied both rhythms in the blow fly Calliphora vicina. The locomotor activity rhythm of C. vicina was monitored in light/dark (LD 12:12) and in constant darkness (DD). After this, each fly was fixed and the cross-sectional areas of L1 and L2's lamina axons were examined during the day and night in LD, and in the fly's active and rest periods in DD. In LD, L1 and L2's axons were larger during the day than during the night and the larger sizes correlated with the activity of the flies. Moreover, arrhythmic flies showing a high activity level had larger cells than less active flies. In DD, however, both circadian rhythms became out of phase. The results indicate a correlation between both circadian rhythms, which run in-phase in LD, larger cell sizes corresponding to higher activity in the flies. In DD, however, they run independently, so that these rhythms are probably generated by different circadian clocks. (C) 2001 Elsevier Science Ltd. All rights reserved.