Abstract
Photoreceptor composition and retinal visual pigments in three newt (Caudata, Salamandridae, Pleurodelinae) species (Pleurodeles waltl, Lissotriton (Triturus) vulgaris, and Cynops orientalis) were studied by light microscopy and single-cell microspectrophotometry. Retinas of all three species contain “red” (rhodopsin/porphyropsin) rods, large and small single cones, and double cones. Large single cones and both components of double cones contain red-sensitive (presumably LWS) visual pigment whose absorption spectrum peaks between 593 and 611 nm. Small single cones are either blue- (SWS2, maximum absorption between 470 and 489 nm) or UV-sensitive (SWS1, maximum absorption between 340 and 359 nm). Chromophore composition of visual pigments (A1 vs. A2) was assessed both from template fitting of absorption spectra and by the method of selective bleaching. All pigments contained a mixture of A1 (11-cis retinal) and A2 (11-cis-3,4-dehydroretinal) chromophore in the proportion depending on the species and cell type. In all cases, A2 was dominant. However, in C. orientalis rods the fraction of A1 could reach 45%, while in P. waltl and L. vulgaris cones it did not exceed 5%. Remarkably, the absorption of the newt blue-sensitive visual pigment was shifted by up to 45 nm toward the longer wavelength, as compared with all other amphibian SWS2-pigments. We found no “green” rods typical of retinas of Anura and some Caudata (ambystomas) in the three newt species studied.
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Original Russian Text © D.A. Korenyak, V.I. Govardovskii, 2013, published in Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, 2013, Vol. 49, No. 4, pp. 264–271.
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Korenyak, D.A., Govardovskii, V.I. Photoreceptors and visual pigments in three species of newts. J Evol Biochem Phys 49, 399–407 (2013). https://doi.org/10.1134/S0022093013040038
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DOI: https://doi.org/10.1134/S0022093013040038