A LIGHT-MICROSCOPIC STUDY OF SOME TRANSLOCATIONS IN ASPERGILLUS NIDULANS

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Abstract
A cytological investigation of A. nidulans (Eidam) Winter, was undertaken to test the feasibility of using simple light microscopic techniques to study chromosome aberrations for the correlation of chromosomes and linkage groups in this genetically well analyzed fungus. Pachytene chromosome analysis was not possible, because the chromosomes are very small, do not spread well when squashed and show very little structural detail. Some catenations were seen at 1st metaphase in translocation heterozygotes either as dense masses or, more rarely, as open rings. Lagging chromosomes were also seen at low frequency in both 1st and 2nd anaphase and telophase in translocation but not in control material. Meiotic chromosome behavior in A. nidulans heterozygous for reciprocal translocations is probably similar to that in some higher organisms. The species is not suitable for detailed cytological analysis, at least by the techniques employed.

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