ELECTRO-PHYSIOLOGICAL ANALYSIS OF FLY RETINA .1. COMPARATIVE PROPERTIES OF R1-6 AND R7 AND 8
ELECTRO-PHYSIOLOGICAL ANALYSIS OF FLY RETINA .1. COMPARATIVE PROPERTIES OF R1-6 AND R7 AND 8
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DOI：
10.1007/bf00679908
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发表时间：
1979-01-01
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影响因子：
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通讯作者：
HARDIE, RC
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作者：
HARDIE, RC
从果蝇丽蝇属（野生）和蝇属（白色）的光感受器类别R1 -6、R7和R8进行细胞内记录。角灵敏度函数的半宽度（Δρ）在丽蝇属R1 -6中，在1.5 °之间变化。在中心凹和3.0 °。在侧眼区域。光适应将这些值缩小了20%。在丽蝇属中，有足够强度的适应光激活瞳孔机制，使R 1-6中490 nm的光谱灵敏度峰值向较短的波长移动40-50 nm，但在蝇属的无瞳孔突变体白色中没有。R7有两个光谱类别。两者都具有在340-360 nm范围内的单一灵敏度峰，但1是纯紫外（UV）灵敏的，具有超过400 nm的< 10%灵敏度，而另一个具有延伸至500 nm的灵敏度长尾。大多数R8细胞在540 nm附近具有灵敏度主峰。丽蝇属R1 -6在绿色条件下的偏振敏感度（PS）平均为2.0，不受光适应的显著影响。在Musca R 1-6中，PS平均为1.9。在R7中，丽蝇属的PS相似（平均2.2），但蝇属的PS值高达6。由于每个量子的电压增益更高，所以从使用峰值波长的轴向光（APS 50）产生50%最大响应所需的量子通量测量的绝对灵敏度在R7和R8中更高。所有受体类光以类似的方式适应，并在所使用的最亮适应机制下继续对强度的增加作出反应。这些新的结果，从确定的受体导致重新评估的可能作用的R1 -6和R7和8在optomotor的反应引起不同制度的测试模式的波长和强度。
Intracellular recordings were made from the photoreceptor classes R 1-6, R7 and R8 in the flies, Calliphora (wild) and Musca (white). The half width of the angular sensitivity function (.DELTA. .rho.) in Calliphora R 1-6 varies between 1.5.degree. in the fovea and 3.degree. in the lateral eye regions. Light adaptation narrows these values by 20%. The presence of an adapting light of sufficient intensity to activate the pupil mechanism shifts the 490 nm peak of spectral sensitivity in R 1-6 towards shorter wavelenghts by 40-50 nm in Calliphora but not in the pupilless mutant, white, of Musca. There are 2 spectral classes of R7. Both have a single peak of sensitivity in the range 340-360 nm, but 1 is purely ultra-violet (UV) sensitive, having < 10% sensitivity beyond 400 nm, whilst the other has a long tail of sensitivity extending to 500 nm. The majority of R8 cells have a major peak of sensitivity at around 540 nm. Polarization sensitivity (PS) in Calliphora R 1-6 averages 2.0 when measured in the green, and is not significantly affected by light-adaptation. In Musca R 1-6, PS averages 1.9. In R7, PS is similar in Calliphora (average 2.2), but reaches values of up to 6 in Musca. Absolute sensitivities measured from the quantal flux required to generate a 50% maximum response using axial light of peak wavelength (APS50) are higher in R7 and R8 due to the higher voltage gain per quantum. All receptor classes light adapt in a similar manner and continue responding to increments of intensity under the brightest adapting regimes used. These new results from identified receptors lead to a reappraisal of the possible roles of R 1-6 and R7 and 8 in optomotor responses elicited under different regimes of test pattern wavelength and intensity.