TRANSLOCATIONS AND RECESSIVE LETHALS INDUCED INASPERGILLUSBY ULTRA-VIOLET LIGHT AND GAMMA-RAYS

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Abstract
A diploid strain of the fungus Aspergillus nidulans heterozygous for markers on all linkage groups was irradiated with ultra-violet light at doses which gave survival values of 1-5%. The genotype of 19 diploid survivors was analyzed by selecting a large number of haploids from each to detect induced translocations and lethals. No viable translocations were found, but recessive lethals showed a frequency of about 25% (5 cases). In addition, one case was found of a nucleus which contained either a translocation with recessive lethal effect (deficiency-translocation) or recessive lethals on 2 chromosomes. All controls were of parental genotype. From the comparison of these results with those reported in similar experiments using gamma-rays it can be concluded that treatments of fungus chromosomes with ultra-violet light and ionizing radiations produce patterns of recessive lethals and translocation frequencies similar to those found in higher organisms.

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