Abstract
In the drone retina light elicits an increase in the extracellular Ca 2+ concentration ([Ca] o). After withdrawal of extracellular Ca 2+ and addition of 1 mM EGTA (ethyleneglycol-bis (β-aminoethyl ether) N, N, N′, N′-tetraacetic acid) a short light flash still caused an increase in [Ca] o as measured with Ca 2+-sensitive microelectrodes. This increase vanished after a few flashes. When [Ca] o was reduced to 10 −5 M Ca 2+ (no EGTA) the rise in Ca o disappeared after several light flashes. Subsequent stimulation with a dim steady light produced a decrease in [Ca] o and caused a recovery of the increase in [Ca] o elicited by a test flash. The results show that bee photoreceptors have a light-depletable intracellular Ca 2+ store which can be reloaded by dim continuous lights.
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