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Electrophysiological sensitivity of carotenoid deficient and replaced Drosophila

Published online by Cambridge University Press:  02 June 2009

De-Mao Chen  and
William S. Stark
De-Mao Chen
Affiliation:
Department of Biology, St. Louis University, Missouri
William S. Stark
Affiliation:
Department of Biology, St. Louis University, Missouri
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Abstract

R1–6 dominated electroretinographic (ERG) spectral sensitivities were determined as a function of days posteclosion from carotenoid deprived and replaced white-eyed Drosophila. The sensitivity of flies deprived from egg to adult waxed (about 1.5 log units by day 3), and then waned gradually from 3–11 days (over 2 log units by day 11). Carotenoid replacement (feeding nothing but carrot juice) effected recovery to near the replete control' level in about 1 day throughout (tested at 0, 4, and 11 days). The normal yellow cornmeal-agar-molasses-brewers yeast fly food (in our laboratory, supplemented with β-carotene) renders a slower recovery (requiring 7–9 days) since it is a medium designed largely for larval growth. Placing replete adults on deprivational medium did not create a deprivational syndrome in over 11 days. At 3–7 days, deprived flies reared and maintained in constant darkness had substantially enhanced sensitivity, beyond the 1.5 log unit increment already described for cyclic light rearing conditions. All spectral analyses are consistent with the ultraviolet (UV) sensitization of the blue (480 nm) rhodopsin by a replacement-dependent retinoid including two unexpected findings: (1) sensitivity recovery with carrot juice was so fast that the UV peak was already high at 6 h; and (2) the waxing of the deprived fly's sensitivity in dark rearing was so great that the UV peak was present at 4–7 days.

Keywords

Carotenoid replacementVitamin A deprivationVisual pigmentSensitivityElectroretinogram (ERG)Spectral sensitivity
Type
Research Articles
Information
Visual Neuroscience , Volume 9 , Issue 5 , November 1992 , pp. 461 - 469
Copyright
Copyright © Cambridge University Press 1992

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