Distribution of Circadian Photoreceptors in the Compound Eye of the Cricket Gryllus bimaculatus
Distribution of Circadian Photoreceptors in the Compound Eye of the Cricket Gryllus bimaculatus
复制标题
双斑蟋蟀复眼昼夜光感受器的分布
DOI：
10.1177/074873049000500403
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发表时间：
1990
影响因子：
3.5
通讯作者：
Y. Chiba
中科院分区：
文献类型：
--
作者：
K. Tomioka;Yasuo Okada;Y. Chiba
成年雄性蟋蟀(Gryllus Bimaculatus)表现出夜间昼夜运动节律，由视板-髓质复合体中的起搏器驱动，并与复眼接收的光-暗(LD)周期同步。为了了解眼睛中是否有任何特殊分化的昼夜节律光感受器区域，我们检查了除了去除对侧视板-延髓-复眼复合体外，部分减少复眼不同区域对运动节律的携带能力的影响。所有手术动物的运动节律都表现出对LD周期的反应，无论眼睛的哪个区域保持完好：它们要么稳定地进入LD周期，要么显示出弱缠绕的迹象。仅剩262个小眼时，仍能保持稳定的夹带能力。在LD周期提前6小时后，重新夹带所需的瞬时周期在20只缩眼动物身上被测量，显示出明显的稳定夹带。它们与缩小眼的小眼数成反比：小眼数越少，观察到的短暂周期越多(r=-0.76，p<；0.001)。这些结果表明，复眼的几乎整个区域可能含有昼夜节律光感受器，来自每个小眼的光信息可能通过神经整合机制附加地影响昼夜节律。
Adult male crickets (Gryllus bimaculatus) show a nocturnal circadian locomotor rhythm, which is driven by the pacemaker in the optic lamina-medulla complex and synchronizes to the light-dark (LD) cycle received by the compound eye. To see whether there was any specially differentiated circadian photoreceptor area in the eye, we examined the effect of a partial reduction of various areas of the compound eye, in addition to a removal of the contralateral optic lamina-medulla-compound eye complex, on entrainability of the locomotor rhythm. All operated animals showed a response to the LD cycle in their locomotor rhythm, no matter which area of the eye was left intact: They either stably entrained to an LD cycle or showed a sign of weak entrainment. The capacity for stable entrainment was still retained when only 262 ommatidia were left. Transient cycles needed for re entrainment, following a 6-hr phase advance of the LD cycle, were measured in 20 reduced-eye animals showing clear stable entrainment. They were in inverse proportion to the number of ommatidia in the reduced eye: The fewer ommatidia there were, the more transient cycles were observed (r = -0.76, p < 0.001). These results suggest that almost the whole area of the compound eye may contain circadian photoreceptors, and that the photic information from each ommatidium may additively affect the circadian clock to entrain via neural integration mechanisms.