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Spectral sensitivities of 7 morphological types of photoreceptors in the retina of the turtle geoclemys reevesii


Journal of Comparative Neurology 237(2): 145-154
Spectral sensitivities of 7 morphological types of photoreceptors in the retina of the turtle geoclemys reevesii
Spectral sensitivities of photoreceptors in the turtle (Geoclemys) retina were studied by intracellular recording, and each cell was filled with Lucifer yellow (LY). Photoreceptors were classified into 7 morphological types: rod, 4 types of single cones, and 2 members of a double cone. Single cones contained 1 of 4 different oil droplets: red, pale-green, orange, and clear. Double cones consisted of 2 apposed cones; principal members contained yellow oil droplets, while accessory members contained no oil droplet. Spectral sensitivities recorded from these 7 types of photoreceptors were classified into 1 type of rod and 3 chromatic types of cones. Rods (n = 19) showed peak sensitivity at 520 nm. Single cones containing either a red (n = 51) or a pale-green (n= 9) oil droplet were red-sensitive (.lambda.max at 620 nm). Single cones containing an orange oil droplet (n = 14) were green-sensitive (.lambda.max at 540 nm). Single cones containing a clear oil droplet (n = 3) were blue-sensitive (.lambda.max 460 nm). Both members of the double cone, principal (n = 22) and accessory (n = 15), were red-sensitive (.lambda.max at 620 nm). No diffusion of LY was detected between the apposed members of double cones. Red-sensitive cones, therefore, consisted of 4 different morphological types of cones, and they occupy .apprx. 70% of the photoreceptor mosaic in the turtle retina.


Accession: 006459839



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