Wagner H J, Douglas R H
Invest Ophthalmol Vis Sci. 1983 Jan;24(1):24-9.
Light adaptive morphologic changes in the teleost retina, such as movements of rods, cones, and epithelial pigment and spinule formation on horizontal cell terminals, are normally associated with continual exposure to light. Depending on a variety of factors these processes are generally completed within 30-60 min. In this report we show that a brief exposure to light (1-2 min) preceded and followed by darkness is sufficient to elicit these changes in four species of teleost; the trout (Salmo gairdneri), the tench (Tinca tinca), the carp (Cyprinus carpio), and the goldfish (Carassius auratus). A brief pulse is as effective in causing cone migration and an increase in the number of spinules as continual exposure; however, it is sometimes less effective in causing pigment migration. The photomechanical changes following a brief period of light are always completed more quickly and show greater species variability than the formation of spinules. These results show that the various morphologic manifestations of light adaptation are autonomous processes that need only a short pulse of light to trigger the whole sequence of events. This is of interest when considering their control mechanisms and may have consequences for physiologic work involving experiments on dark-adapted eyes.
硬骨鱼视网膜的光适应性形态变化，如视杆细胞、视锥细胞和上皮色素的移动以及水平细胞终末上棘状突起的形成，通常与持续暴露于光线下有关。根据多种因素，这些过程一般在30至60分钟内完成。在本报告中，我们表明，在黑暗之前和之后进行短暂的光照（1至2分钟）足以在四种硬骨鱼中引发这些变化；虹鳟（Salmo gairdneri）、丁鱥（Tinca tinca）、鲤鱼（Cyprinus carpio）和金鱼（Carassius auratus）。短暂的脉冲在引起视锥细胞迁移和棘状突起数量增加方面与持续暴露一样有效；然而，在引起色素迁移方面有时效果较差。短暂光照后的光机械变化总是比棘状突起的形成完成得更快，并且表现出更大的物种变异性。这些结果表明，光适应的各种形态表现是自主过程，只需要短暂的光脉冲就能触发整个事件序列。在考虑其控制机制时，这一点很有趣，并且可能会对涉及暗适应眼睛实验的生理工作产生影响。
