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Chromosome rearrangements resulting in increased aneuploid production in Sordaria brevicollis

Published online by Cambridge University Press:  14 April 2009

D. J. Bond  and
S. J. Broxholme
D. J. Bond
Affiliation:
Department of Genetics, King's Buildings, University of Edinburgh, Edinburgh EH9 3JN, Scotland
S. J. Broxholme
Affiliation:
Department of Genetics, King's Buildings, University of Edinburgh, Edinburgh EH9 3JN, Scotland
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Summary

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Two spontaneously arising chromosome rearrangements were isolated in Sordaria brevicollis from one perithecium. These were detected through increased production of black spores in intercrosses of complementing buff spore colour mutants. One was a reciprocal translocation between linkage groups I and II; the other a reciprocal translocation between linkage groups II and VI. In the former case the translocation resulted in frequent non-disjunction generating black spores which were either tertiary or interchange disomics. The frequency of premature centromere division was also increased. In the case of the translocation involving linkage groups II and VI the black spores were formed as a result of adjacent-1 segregation and were probably duplication/deficiency products.

In both rearrangements the breakpoint in linkage group II was, as far as could be judged, in an identical place. This and the fact that they were isolated from a single fruiting body, suggests that the chromosome breakage event arose as a potential lesion, which replicated before the potential break was either restituted, to restore a normal chromosome, or opened, to form the rearrangements.

Type
Research Article
Information
Genetics Research , Volume 42 , Issue 3 , December 1983 , pp. 297 - 310
Copyright
Copyright © Cambridge University Press 1983

References

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