Ultrastructure and adaptation in the retina of Aglais urticae (Lepidoptera)
Ultrastructure and adaptation in the retina of Aglais urticae (Lepidoptera)
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斑翅目（鳞翅目）视网膜的超微结构和适应
DOI：
10.1007/bf00312143
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发表时间：
1985
期刊：
影响因子：
1
通讯作者：
Gertrud Kolb
中科院分区：
文献类型：
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作者：
Gertrud Kolb
荨麻的对位眼由小眼组成。从眼额外侧和眼腹外侧区域连续切片和不同水平的作图显示，整个小眼眼沿其长轴没有扭转。网膜的感觉部分由九个视网膜细胞组成。复杂横纹图结构（如图3所示）最显著的特征如下。垂直排列的受体细胞v1和V5，在第9个细胞开始的水平上成为轴突，具有成束排列的微绒毛。这些细胞的微绒毛束通常在小囊横截面的背腹轴的一侧或另一侧成30 ~ 55°的角α。这两个方向沿横纹肌的长度有规律地交替。与v细胞微绒毛的弯曲相结合，这些束以规则的间隔重复扫描被认为是横纹肌扭曲的“替代品”。4个对角线排列的受体细胞D2、4、6、8具有连续的横纹肌，尽管大小不一。这些横纹肌，像水平排列的细胞（h3和H7）一样，沿着整个横纹肌延伸，尽管在h细胞横纹肌中有一个小的（1-2 μm）中断；后者具有最恒定的方向。色素颗粒在D细胞中最丰富，其次是H细胞，最后是V细胞。RC9lacks颜料。光适应和暗适应实验显示视网膜细胞色素（瞳孔反应）有明显的水平迁移和轻微的垂直迁移。在波长λ=342、436、522、578和626 nm处的单色适应实验表明，d细胞在波长λ= -520 nm处具有特殊的敏感性。有迹象表明V细胞对紫外线敏感，可能对H细胞对蓝色敏感。H细胞被认为适合于检测偏振光。讨论了这些发现的功能意义，并与已知的其他蝴蝶眼睛进行了比较。
The apposition eye ofAglais urticaeis composed of eucone ommatidia. Serial sectioning of blocks from the laterofrontal and lateroventral eye regions and mapping at different levels revealed that there is no torsion of whole ommatidia along their long axes.The sensory part of the ommatidium comprises nine retinula cells. The most significant features of the complicated rhabdom structure (diagrammed in Fig. 3) are as follows. The vertically aligned receptor cells V1and V5, which become axonal at the level at which the ninth cell begins, have microvilli arranged in bundles. The microvilli bundles of these cells generally make an angle α between 30 and 55° on one or the other side of the dorsoventral axis in the ommatidium cross section. The two orientations alternate regularly along the length of the rhabdom. The repeated sweeps of these bundles in regular intervals in combination with the curvature of the V-cell microvilli is considered to be a “substitute” for rhabdomere twisting. The four diagonally aligned receptor cells D2,4,6,8have rhabdomers that are continuous, though of variable size. These rhabdomeres, like those of the horizontally aligned cells (H3and H7), extend along the entire rhabdom, though there is a small (1–2 μm) interruption in the H-cell rhabdomeres; the latter have the most constant orientation. Pigment granules are most abundant in the D cells, followed by the H cells and finally the V cells. RC9lacks pigments.Light- and dark-adaptation experiments reveal marked horizontal migration of the retinula-cell pigment (pupil reaction) and slight vertical migration. Monochromatic adaptation experiments at wavelengths λ=342, 436, 522, 578, and 626 nm indicate special sensitivity of the D-cells around λ-520 nm. There are indications for sensitivity of V cells in the UV, and possibly of H cells in the blue. The H cells are regarded as suited for the detection of polarized light. The functional significance of these findings is discussed and compared with what is known of other butterfly eyes.