Effects of Gamma-Rays on the Taste Buds of Embryos and Adults of the Fish Oryzias latipes

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The present study was performed in order to evaluate the state of activity of the taste bud cells of the fish Oryzias latipes. Two types of taste bud cells, namely pale cells and dark cells were distinguished and scored separately. From the irradiation experiment on adult fish, it was found that pale cells were more radiosensitive than are dark cells. At 10 days after irradiation with 1000 R, repopulation of the pale cells was observed and their number returned almost to the control value. In the experiments using various stages of embryos, the formation of the taste bud cells was highly radiosensitive at their early embryonic stages. The organs of taste in the vertebrates consist of groups of epithelial cells, 'taste buds. ' In mammals these structures are almost entirely confined to the tongue and to particular types of papillae on the dorsal surface of that organ. 1) However, in fish, as well as such internal taste buds, similar structures are found also on the outside of the head, on the body surface, the barbels (whiskers) and the gill arches.
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