Abstract
14 mutants of Aspergillus nidulans were isolated which were more sensitive to the lethal effects of UV light than wild-type strains. Haploidization analysis of 6 mutants showed that 4 are on linkage group IV, 1 on V and the other on II or VIII. The sensitivity of 6 mutants to nitrous acid was tested and it was found that ranking in terms of UV sensitivity paralleled ranking in terms of nitrous acid sensitivity. No effects on the frequency of meiotic intergenic recombination were found in crosses heterozygous for 7 of the mutants. 1 of these mutants was tested in a homozygous cross and again no effects were observed. The mutations were inherited as single mendelian genes and the survival of diploid conidia after UV irradiation suggested that they were also recessive. 5 mutants had an effect on ascospore development. Viable ascospores were recovered from crosses of these mutant strains in reduced numbers.
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