OXYGEN-DEPENDENT PHOTOSENSITIVITY and MITOTIC RECOMBINATION IN THE SMUT FUNGUS Ustilago violacea |
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Authors: | Oscar H Will III |
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Institution: | Department of Biology, Augustana College, Sioux Falls, SD 57197, USA |
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Abstract: | Abstract— The effect of high intensity incandescent radiation on survival and mitotic recombination in the phlph + diploid strain of Ustilago violacea was studied with and without atmospheric O2. In the presence of atmospheric O2, strain phlph+ was characterized by photokilling to approximately 50% survival, and induction of mitotic recombination to about 60% by 90 min of light exposure. No photokilling and little induction of mitotic recombination were observed when light exposure was carried out in an 02 depleted environment. Photokilling and photo-induced mitotic recombination in U. violacea may be due to DNA damage or repair in response to a photosensitized reaction, involving an endogeneous photosensitizer. |
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