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Does retinol serve a sensitizing function in insect photoreceptors?

K Kirschfeld, K Vogt

Vision Research

|January 1, 1986

Summary

Simuliid male eyes have a dual spectral sensitivity, with a primary peak in the ultraviolet (UV) range and a secondary peak at 430 nm. This unique vision is due to a UV-absorbing sensitizing pigment, likely retinol, aiding UV light absorption.

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Area of Science:

Entomology
Vision Science
Photobiology

Background:

The dorsal compound eye of Simuliid males (Nematocera) exhibits distinct spectral sensitivity.
Understanding insect vision is crucial for ecological and evolutionary studies.

Purpose of the Study:

To investigate the spectral sensitivity and underlying mechanisms of the Simuliid male compound eye.
To compare Simuliid photoreceptor properties with those of other Diptera.

Main Methods:

Spectrophotometric analysis of Simuliid male compound eye spectral sensitivity.
Identification of visual and sensitizing pigments involved in photoreception.

Main Results:

A primary peak sensitivity was observed in the UV range at 340 nm, with a secondary peak around 430 nm.
The visual pigment, a rhodopsin, has an absorption maximum at 430 nm.
A distinct UV-absorbing sensitizing pigment, likely retinol, facilitates energy transfer to the visual pigment.

Conclusions:

Simuliid male photoreceptors share similarities with higher flies (e.g., Musca, Calliphora, Drosophila) due to a UV-absorbing sensitizing pigment.
The sensitizing pigment in Simuliids is distinct from 3-hydroxyretinol found in higher flies, suggesting retinol as the likely substance.

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