Reversed Light Reaction of the Screening Pigment in a Compound Eye Induced by Noradrenaline
نویسنده
چکیده
* Arbeitsgruppe Sehphysiologie. Abteilung für Biologie. Ruhr-Universität. D-4630 Bochum, Bundesrepublik Deutschland ** D epartm ent of Physiology, Karolinska Institute, S-10401 Stockholm, and D epartm ent of Occupational Neuromedicine, National Board of Occupational Safety and H ealth, S-17184 Solna, Sweden Z. Naturforsch. 42c, 973—976 (1987); received October 13, 1986/March 18. 1987 Screening Pigment, Pigment Migration, Compound Eye, Sphingid Moth, Noradrenaline Migration of the screening pigment in the compound eye of the sphingid moth Deilephila elpenor is altered by noradrenaline, as shown by microreflectometric measurements on eyes of intact moths and by transmission microscopy on preparations consisting of the screening pigment cells and dioptric structures. Local application of noradrenaline inverts the reaction of the pigment to light stimulation; light causes a contraction of the pigment instead of the normal dispersion. It is suggested that catecholamines are involved in the normal regulation of pigment migration.
منابع مشابه
Effect of Neurotransmitters on Movement of Screening Pigment in Insect Superposition Eyes
The light-induced expansion of the screening pigment in the compound eyes of the sphingid moth Deilephila and the owlfly Ascalaphus is counteracted by local application of noradrenaline or octopam ine. A t a critical concentration, similar for both drugs, the expanding effect caused by a light stimulus is com pletely neutralized, and at higher drug concentrations light stimulation induces a con...
متن کاملRetinal morphology and retinomotor response in Caspian kutum (Rutilus frisii subsp. kutum)
In this study, the morphology and organization of the retina of Caspian kutum and fish response to ambient light as retinomotor reaction was investigated. The Rutilus frisii subsp. kutum is an anadromous fish and important native fish specimen of Caspian Sea. The specimens were obtained from Shahid Ansari Teleost Reproduction and Culture center (Guilan province, Iran). For light and dark adapta...
متن کاملInvestigation of the Screening Pigment System in the Compound Eye of the Moth Agrotis segetum (fam. Noctuidae) by Visible Reflectometry
The functional properties of the light adaptation system in the superposition eye of the moth Agrotis segetum have been investigated by reflection spectroscopy. The spectrum of the reflected light from the tapetum of dark adapted eyes had a peak at about 580 nm corresponding to a spacing between the reflecting layers in the tapetum of 145 nm. During light adaptation of the eye the observed refl...
متن کاملLight-induced and circadian changes in the compound eye of the haematophagous bug Triatoma infestans (Hemiptera: Reduviidae).
We analysed dynamic changes in the ommatidial structure of the compound eyes of Triatoma infestans. This nocturnal insect possesses open-rhabdom eyes, in which a ring of six rhabdomeres from retinula cells 1-6 (R1-6) surrounds a central pair of rhabdomeres from retinula cells 7 and 8 (R7-8). Screening pigments are located in all the photoreceptors and in the primary (PPC) and secondary (SPC) pi...
متن کاملCalcium Enables Photoreceptor Pigment Migration in a Mutant Fly
Upon bright illumination, pigment granules in the photoreceptors of the fly compound eye migrate transversely toward the rhabdomeres (Kirschfeld & Franceschini, 1969). The granules absorb light passing down the rhabdomeric light guide, thereby reducing the light available to the visual pigment. This light-regulating mechanism is found in a number of invertebrate eyes (Stavenga, 1979) and has be...
متن کامل