Blue and double-peaked green receptors depend on ommatidial type in the eye of the Japanese yellow swallowtail Papilio xuthus
Blue and double-peaked green receptors depend on ommatidial type in the eye of the Japanese yellow swallowtail Papilio xuthus
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DOI：
10.2108/zsj.23.199
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发表时间：
2006-02-01
影响因子：
0.9
通讯作者：
Arikawa, Kentaro
中科院分区：
文献类型：
--
作者：
Kinoshita, Michiyo;Kurihara, Daisuke;Arikawa, Kentaro
蝴蝶的复眼是由三种不同类型的小眼组成的。我们通过细胞内记录、体内荧光显微镜和组织学的方法，研究了在I型和III型小眼远端遇到的蓝色和双峰绿色受体。蓝色受体是R1和/或R2光感受器；它们含有编码吸收蓝色视觉色素的视蛋白的相同的mRNA。然而，我们在这里发现，在UV波长区的敏感性强烈地依赖于小眼类型；I型小眼中的蓝色受体对UV的敏感性明显降低，这归因于融合纹状体的侧向滤波。在眼睛的主要额腹部，所有小眼的R3和R4光感受器都含有一套相同的两个mRNA，编码吸收绿色的视觉色素的视蛋白PxL1和PxL2。光谱敏感度呈双峰型，但I型小眼的R3和R4感受器的紫外光敏感度似乎降低，与共定位的蓝色感受器相似。
The compound eye of the butterfly Papilio xuthus is composed of three spectrally distinct types of ommatidia. We investigated the blue and double-peaked green receptors that are encountered distally in type I and III ommatidia, by means of intracellular recordings, in vivo fluorescence microscopy, and histology. The blue receptors are R1 and/or R2 photoreceptors; they contain the same mRNA encoding the opsin of the blue-absorbing visual pigment. However, here we found that the sensitivity in the UV wavelength region strongly depends on the ommatidial type; the blue receptors in type I ommatidia have a distinctly depressed UV sensitivity, which is attributed to lateral filtering in the fused rhabdom. In the main, fronto-ventral part of the eye, the R3 and R4 photoreceptors of all ommatidia contain the same set of two mRNAs encoding the opsins of green-absorbing visual pigments, PxL1 and PxL2. The spectral sensitivities are double-peaked, but the UV sensitivity of the R3 and R4 photoreceptors in type I ommatidia appears to be reduced, similar to that of the co-localized blue receptors.