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Mutants of Ustilago maydis resistant to dicarboximide (DCOF) and aromatic hydrocarbon fungicides (AHF) were isolated after chemical mutagenesis or by selection of spontaneous mutants on fungicide-amended agar medium. A wide range of mutants, with low to high levels of resistance, were isolated. The resistance factor compared to the wild type was greater than 150 for three mutants isolated on tolclophos-methyl and greater than 50 for three mutants isolated on vinclozolin. Growth rates for these six most tolerant isolates were similar to that of the wild type. The phenomenon of cross-resistance between these two groups was confirmed. None of the mutants were resistant to the ergosterol biosynthesis inhibitor propiconazole. Two mutants, VR43 and VR44, demonstrated the same osmotic sensitivity when grown in the presence of NaCl (1-8%) as the wild type under these conditions
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Ann B. Orth (1994) studied this question.
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