Abstract
SOMATIC, or mitotic, crossing-over1 occurs in nuclei of the mycelium of the homothallic ascomycete Aspergillus nidulans2,3, made diploid and heterozygous for known markers by means of a new technique2. The asexual Aspergillus niger has now been found to behave in a similar manner; that is, diploids heterozygous for known markers give mitotic recombinants homozygous for one or more of these markers but usually still heterozygous for the others, and therefore undergoing further mitotic recombination. Detailed analysis of mitotic recombinants in A. nidulans further shows that mitotic crossing-over is not distributed at random between the nuclei of the mycelium but tends to be concentrated in a small proportion of them. The kind of evidence on which this conclusion is based is exemplified in the following paragraphs.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Stern, C., Genetics, 21, 624 (1936).
Roper, J. A., Experientia, 8, 14 (1952).
Pontecorvo, G., and Roper, J. A., J. gen. Microbiol. (in the press).
Sansome, E., Trans. Brit. Mycol. Soc., 32, 305 (1949).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
PONTECORVO, G. Non-random Distribution of Multiple Mitotic Crossing-over among Nuclei of Heterozygous Diploid Aspergillus. Nature 170, 204–205 (1952). https://doi.org/10.1038/170204b0
Issue Date:
DOI: https://doi.org/10.1038/170204b0
This article is cited by
-
Karyologische Untersuchungen an Arten und Formen der Gattung Botrytis Mich.
Archiv für Mikrobiologie (1965)
-
Analysis of mitotic recombination inAspergillus nidulans
Journal of Genetics (1954)
-
Recombination without Sexual Reproduction in Penicillium chrysogenum
Nature (1953)
-
The structure and behavior of fungus nuclei
The Botanical Review (1953)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.