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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