The spectral sensitivity of the visual cells R7 and R8 in the eye of the blowflyCalliphora erythrocephala
The spectral sensitivity of the visual cells R7 and R8 in the eye of the blowflyCalliphora erythrocephala
复制标题
丽蝇眼睛R7和R8视觉细胞的光谱敏感性
DOI：
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发表时间：
1979
期刊：
影响因子：
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通讯作者：
P. Meffert
中科院分区：
文献类型：
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作者：
U. Smola;P. Meffert
1.用细胞内记录法测定了红头丽蝇眼视感受器R7和R8的光谱敏感性。细胞内标记Procion yellow-in方法可准确识别细胞。2.这两种受体类型的细胞可分为4种类型，其光谱敏感性有显著差异。在此基础上，R7和R8都可以分为两个群体：a.远端中央细胞群R7由双峰紫外蓝受体组成，在约350 nm和约440 nm处具有最大值（R7 UB）;蓝色的最大值几乎总是小于紫外线的最大值，对于单峰紫外线受体，B.近端中央细胞组R8由在约440 nm处具有最大值的单峰蓝色受体（R8 B）和在约520 nm处具有最大值的单峰绿色受体（R8 G）组成;在某些情况下，R8在350 nm左右可出现第二个峰。3.不同光谱敏感性的穿透中枢视细胞的不同频率，导致存在两种不同的中枢横纹肌串联组合的假设。这些组合出现在眼睛的中间区域，R7 UB-R8 G：R7 UV-R8 B的比例为1.3 ∶ 2.4。这表明，功能不同的组合R7 UB-R8 G和R7 UV-R8 B与结构不同的中央杆粒（sl和ls型; Smola，1977）有关。
Summary1.The spectral sensitivity of the visual receptors R7 and R8 in the eye ofCalliphora erythrocephala was determined by intracellular recording. The cells were reliably identified by intracellular marking with Procion yellow.2.Cells in these two morphologically defined receptor classes could be assigned to 4 types differing significantly in spectral sensitivity. Both R7 and R8 can be subdivided into two populations on this basis.a.The group of distal central cells, R7, consists of dual-peaked UV-blue receptors, with maxima at about 350 nm and about 440 nm (R7UB); the maximum in the blue is nearly always smaller than the UV maximum, and of single-peaked UV receptors, with a maximum at about 350 nm (R7UV).b.The group of proximal central cells, R8, consists of single-peaked blue receptors (R8B), with a maximum at about 440 nm, and single-peaked green receptors (R8G), with a maximum at about 520 nm; in some cases R8 can exhibit a secondary peak at about 350 nm.3.The different frequencies of penetrated central visual cells of different spectral sensitivities, lead to the hypothesis of the existence of two different central rhabdomere tandem combinations. These combinations appear in the middle region of the eye in a ratio of R7UB-R8G:R7UV-R8B≈3∶2.4.It is suggested that the functionally different combinations R7UB-R8G and R7UV-R8B are related to the structurally different central rhabdomeres (sl and ls type; Smola, 1977) (Fig. 10).5.The different spectral sensitivities of the central receptors R7 and R8 suggest that these receptors are involved in phototactic behaviour and colour vision of the fly.