光照对棕色田鼠和昆明小鼠眼胚后发育的影响

研究棕色田鼠和昆明小鼠在不同光照处理条件下视网膜各层厚度及细胞密度,进而对其视觉系统发育特征进行比较.结果表明在黑暗条件下,昆明小鼠视网膜的总厚度趋于变薄,棕色田鼠则相反;在有光情况下,棕色田鼠视网膜总厚度趋于变薄,昆明小鼠则相反;不同的光照处理条件下,两种鼠视网膜的外核层和内核层的核层均逐渐由厚变薄.研究结果提示,在视觉系统发育过程中,地上鼠和地下鼠的视网膜可对不同的光照条件产生适应性的结构变化,反映了二者进化史的差异.

Impaction on the Development of the Eye between Mandarin Voles and KM Mice from Light

Different treatments of light were given to both mandarin voles and KM mice.The thickness of each retinal layers and density of cells were measured to compare the developmental features of their visual system.It was showed： 1） in dark,the total thickness of retina was tended to be thinner in KM mice,while the mandarin voles was on the opposite;2） in light,the total thickness of retina was tended to be thinner in mandarin voles,while the KM mice was on the opposite;3） in both light and dark conditions,the thickness of both the outer nuclear layers and the inner nuclear layers of retina were gradually tended to be thinner.The results suggested that during the development of the visual system,adaptive changes of the retinal structure of subterranean rodents and ground rodents could be generated because of different light conditions,reflecting the difference of evolutionary history.