LOCALIZATION OF SPECTRAL RECEPTORS IN THE OMMATIDIUM OF BUTTERFLY COMPOUND EYE DETERMINED BY POLARIZATION SENSITIVITY
LOCALIZATION OF SPECTRAL RECEPTORS IN THE OMMATIDIUM OF BUTTERFLY COMPOUND EYE DETERMINED BY POLARIZATION SENSITIVITY
复制标题
DOI：
10.1007/bf00223959
复制
发表时间：
1992-10-01
影响因子：
2.1
通讯作者：
EGUCHI, E
中科院分区：
文献类型：
--
作者：
BANDAI, K;ARIKAWA, K;EGUCHI, E
1.凤蝶复眼中有5种光谱感受器。每种类型的光谱灵敏度分别在UV、紫色、蓝色、绿色和红色波长处达到峰值。绿色类型包含有和没有UV次峰的两个子类型。在这里，我们研究了这些光谱受体的小眼内的本地化。一个小眼含有9个光感受器（R1-9），每一个都是5种光谱感受器类型之一。光感受器具有平行的微绒毛，形成非扭曲的感杆束，因此光感受器具有偏振敏感性.我们首先通过电子显微镜检查微绒毛的取向。R1、2和9的微绒毛朝向背腹（0度），而R3和4的微绒毛平行于前后轴（90度）。R5-8具有对角的微绒毛：R6和R8为45度，R5和R7.4为135度。然后，我们记录了光谱和偏振灵敏度从单一的光感受器。UV、紫色和蓝色受体的偏振灵敏度的峰值角（theta（max））为0度左右，而绿色受体的偏振灵敏度的峰值角为90度左右。在双峰绿色受体中，紫外线下的θ（最大值）也在90度左右。红色受体在35度左右显示出θ（最大值）。在UV下测量的双峰绿色受体的偏振灵敏度比（P（max）/PS（min））约为4，而其它受体的比率约为2.5。我们的结论是，R1和R2是紫外线，紫色或蓝色受体，而R3和R4是绿色受体。一些R6和R8是红色受体。我们还得出结论，在双峰绿色受体中的UV第二峰不是简单地归因于与UV受体的耦合。
1. A butterfly Papilio has 5 types of spectral receptors in the compound eye. The spectral sensitivity of each type peaks in the UV, violet, blue, green, and red wavelengths, respectively. The green type contains two subtypes with and without a UV secondary peak. Here we studied the localization of these spectral receptors within the ommatidium.2. An ommatidium contains 9 photoreceptors (R1-9), each of which is one of the 5 spectral receptor types. The photoreceptors bear parallel microvilli to form a non-twisted rhabdom, and thereby the photoreceptors are polarization sensitive.3. We first examined the microvillar orientation by electron microscopy. The microvilli of R1, 2, and 9 are oriented dorso-ventrally (0-degrees), whereas those of R3 and 4 are parallel to the antero-posterior axis (90-degrees). The R5-8 bear microvilli diagonally: 45-degrees for R6 and R8, 135-degrees for R5 and R7.4. We then recorded spectral and polarization sensitivities from single photoreceptors. The peak angle of the polarization sensitivity (theta(max)) of the UV, violet, and blue receptors were around 0-degrees, whereas that of the green receptors was around 90-degrees. In the double-peaked green receptors, the theta(max) at UV was also around 90-degrees. The red receptors showed a theta(max) at around 35-degrees. The polarization sensitivity ratio (P(max)/PS(min)) of the double-peaked green receptors measured at UV was around 4, whereas the ratio of other receptors was around 2.5. We conclude that R1 and R2 are either UV, violet, or blue receptors whereas R3 and R4 are green receptors. Some R6 and R8 are red receptors. We also conclude that the UV secondary peak in the double-peaked green receptor is not simply attributable to the coupling with UV receptors.