暗适应和光适应时三疣梭子蟹光感受器超微结构的比较

用透射电镜研究了暗适应和光适应的三疣梭子蟹（Portunus tritubereulatus）光感受器的超微结构．结果显示出暗适应时，感杆束的直径大，微绒毛整齐，膜下潴泡囊的体积较小，线粒体、内质网等细胞器较多，色素颗粒位于细胞各处．在光适应时，感杆束的直径小，微绒毛凌乱，膜下潴泡囊的体积较大，板膜体、多囊体、溶酶体等细胞器较多，色素颗粒位于细胞远端接近细胞核层面；另外，微绒毛基部的胞饮泡数量、递质样颗粒以及其他细胞器的分布，暗适应和光适应的光感受器也有着较明显的差异．

The Ultrastructure Comparison of the Light and Dark Adaptation of Compound Eyes in Portunus tritubereulatus

The ultrastructure of photoreceptor in crab(Portunus tritubereulatus), either light or dark adapted, are studied by electron microscopy. The results show that the fine structures of the photoreceptor are different in light and dark adaptation. In dark adaptation, the diameter of rhabdom is big, the microsvilli is orderly, the dimension of perirhabdom vacuole is small, the number of mitochondria and endoplasmic reticulum are comparatively more, and the pigment granules are distributed around nucleolus. In light adaptation, the diameter of rhabdom is small, the microsvilli is messy, the dimension of perirhabdom vacuole is big, and the pigment granules are distributed everywhere in the cytoplasm, and there are more lamellar bodies and multivesicular bodies and lysosomes in cytoplasm. Moreover, the number of pinocytotic vesicle below the microsvilli, chemical neurotransmitter-like particles and other organelles in cytoplasm, are different in light and dark adaptation.