Effects of UV‐irradiation at Various Wavelengths on Sterilizing Drosophila Embryos

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Abstract
Embryos of D. melanogaster at the early intravitelline nuclear multiplication stage were irradiated with UV light at the posterior pole. The sterility and mortality of these embryos were examined in relation to the dose and wavelength of the UV light. Sterility, expressed either as the frequency of pole-cell-deficient embryos, or as the frequency of agametic adults, was dependent on wavelength. UV-irradiation at 280 nm was most effective in causing sterility. The minimum dose of radiation to give a 100% sterility was 200 J/m2 at 280 nm, and 400 J/m2 at 254 nm. Mortality showed no dependency on the wavelength. The possibility that nucleic acids in the posterior region are a target of 280 nm radiation is discussed.

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