Abstract
The influence of colchicine, cytochalasin B, calcium concentration, ouabain, 2,4-dinitrophenol, epinephrine, octopamine, and low temperature on the migration of pigment granules induced by light or darkness in the superposition eye of Ephestia kuehniella was investigated using the size of the eye glow to indicate the position of the granules. Colchicine, low extracellular calcium concentration, 2,4-dinitrophenol, and low temperature inhibit the aggregation of the granules in the secondary pigment cells from the dispersed state, and cause aggregated granules to disperse in darkness. Cytochalasin B inhibits aggregation from the dispersed state, but does not induce dispersal. Ouabain and high extracellular calcium concentration cause a light-induced inhibition of aggregation. The neurotransmitters, epinephrine and octopamine, have no effects on granule position. Dispersion is inhibited only by cytochalasin B. The requirements for aggregation and dispersion are discussed.
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