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Segregation of factors controlling fusion between plasmodia of the true slime mould Physarum polycephalum

Published online by Cambridge University Press:  14 April 2009

R. T. M. Poulter  and
Jennifer Dee
R. T. M. Poulter
Affiliation:
Department of Genetics, University of Leicester
Jennifer Dee
Affiliation:
Department of Genetics, University of Leicester
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1. The occurrence of fusion between plasmodia produced from amoebal clones of P. polycephalum was studied.

2. The occurrence of fusion was found to be strain-dependent and the factors responsible segregated in the progeny of a cross.

3. The segregations found in crosses between several strains led to the conclusion that four alleles (f1–f4) of one gene f were controlling fusion in these strains.

4. Fusion occurs only between plasmodia carrying identical f alleles, except in one class of results.

5. A model accommodating all the results, including the ‘exceptional’ class, is proposed. It requires that the action of the f factors is to inhibit fusion between dissimilar strains rather than to promote fusion between identical strains. Certain physiological deductions from this model are discussed.

6. The locus (mt) determining mating type of the amoebae is not concerned in plasmodial fusion and is unlinked to f.

7. The rate of fusion between some pairs of strains is apparently influenced by modifying genes.

8. It is suggested that, as a result of the operation of the f gene and of the previously described killing reaction, heterokaryons will occur rarely in natural populations of P. polycephalum.

Type
Research Article
Information
Genetics Research , Volume 12 , Issue 1 , August 1968 , pp. 71 - 79
Copyright
Copyright © Cambridge University Press 1968

References

REFERENCES

Alexopoulos, C. J. & Zabka, G. C. (1962). Production of hybrids between physiological races of the true slime mould Didymium iridia. Nature, Lond. 193, 598–599.Google Scholar
Carlile, M. J. & Dee, J. (1967). Plasmodial fusion and lethal interaction between strains in a Myxomycete. Nature, Lond. 215, 832–834.CrossRefGoogle Scholar
Caten, C. E. & Jinks, J. L. (1966). Heterokaryosis: its significance in wild homothallic Ascomycetes and Fungi Imperfecti. Trans. Br. mycol. Soc. 49 (1), 81–93.CrossRefGoogle Scholar
Collins, O. R. (1966). Plasmodial compatibility in heterothallic and homothallic isolates of Didymium iridis. Mycologia, 58, 362–372.CrossRefGoogle Scholar
Collins, O. R. & Clark, J. (1966). Genetic basis of plasmodial compatibility in Didymium iridia. Am. J. Bot. 53, 625.Google Scholar
Daniel, J. W. & Baldwin, H. H. (1964). Methods of culture for plasmodial Myxomycetes. In Prescott, D. M. (ed.), Methode in Cell Physiology 1, 9–41. New York: Academic Press, Inc.Google Scholar
Dee, J. (1966 a). Multiple alleles and other factors affecting plasmodium formation in the true slime mould, Phyaarum polycephalum Schw. J. Protozool. 13 (4), 610–616.CrossRefGoogle Scholar
Dee, J. (1966 b). Genetic analysis of actidione-resistant mutants in the Myxomycete Phyaarum polycephalum Schw. Genet. Res. 8, 101–110.CrossRefGoogle ScholarPubMed
Gray, W. D. (1945). The existence of physiological strains in Phyaarum polycephalum. Am. J. Bot. 32, 157–160.Google Scholar
Lewis, D. (1964). A protein dimer hypothesis of incompatibility. In Geerts, S. J. (ed.), Genetics Today, vol. III. Proc. XI int. Congr. Genetice. Pergamon Press.Google Scholar