Abstract

Abstract— The accumulation of (J‐carotene in the ph/ph + y diploid strain of the smut fungus Ustilago violacea was associated with reduced killing and lower levels of induced mitotic recombination compared to the β‐carotene lacking ph/ph+ w strain in response to both incandescent photosensitization and treatment with H202. The ph/ph+ y strain was only slightly more resistant to killing by exogenous toluidine blue (TB) photosensitization. The ph/ph+ y strain exhibited significantly greater levels of survival when exposed to incandescent radiation and 1.5 μ.M TB for 15 min, as well as 3.0. 0.3, 0.03, 0.003% H202 in the dark. The ph/ph+ y strain also exhibited lower levels of mitotic recombination after endogenous TB photosensitization and the latter two H202 treatments. Similar survival results were obtained for the carotene accumulating haploid strain l.C2y and the carotene lacking haploid strain l.C2iv in response to H202 exposure.

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