Abstract
The UV induction of the malformation “double abdomen” in the eggs of Smittia is photoreversible with a constant dose reduction factor of about 0.7 under certain experimental conditions. The qualitative effect was shown to be significant ( p < 0.01) under various conditions. The near-UV and visible radiation employed for photoreversion did not cause any delay of development and was effective only after, not before, UV irradiation. The results are discussed with regard to direct or indirect photoreversion. From current knowledge about photoreversion in living systems, the results can be regarded as evidence that at least one effective target is a nucleic acid. Since photoreversible UV induction of double abdomens can be achieved by irradiation of a strictly cytoplasmic area, the results are consistent with the hypothesis that the factors which determine the metameric pattern in the eggs of Smittia include the activity of one or more ooplasmic nucleic acids.
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