1887

Abstract

SUMMARY: The ascus cytology of (Ces.) Rehm, a secondarily homothallic Pyrenomycete fungus, has been followed under the light microscope from the crozier, through karyogamy and the three nuclear divisions in the ascus (the first two constituting a meiosis and the third a mitosis) to the first spore mitosis and spore maturation. The spindles remain widely separated at division II, during which segregation for mating type is said to occur. After division III, in which the spindles are transverse, the ascus contains four pairs of sister nuclei. The realignment of the nuclei so that two non-sister nuclei are included in each of the four spores is brought about by the movements of the centrosomes or, more likely, of their outer portions. Spore delimitation, which starts from these organelles, appears as a thin cleavage line separating the spore plasm from the epiplasm of the ascus. A mitosis in the spore initial followed by degeneration of one of the four daughter-nuclei in the primary appendage leads to an imbalance in the mating-type factors in the spore. The wall of the mature spore is separable into three layers, the middle one of which is pigmented. The mucilaginous secondary appendage formed at each end of the spore is already present before the primary appendage is cut off.

Loading

Article metrics loading...

/content/journal/micro/10.1099/00221287-53-1-81
1968-08-01
2021-08-03
Loading full text...

Full text loading...

/deliver/fulltext/micro/53/1/mic-53-1-81.html?itemId=/content/journal/micro/10.1099/00221287-53-1-81&mimeType=html&fmt=ahah

References

  1. Ames L. M. 1932; An hermaphroditic self-sterile but cross-fertile condition in Pleurage anserina.. Bull. Torrey bot. Club 59:341
    [Google Scholar]
  2. Ames L. M. 1934; Hermaphroditism involving self-sterility and cross-fertility in the Ascomycete Pleurage anserina.. Mycologia 26:392
    [Google Scholar]
  3. Carr A. J. H., Olive L. S. 1958; Genetics of Sordaria fimicola. II. Cytology.. Am. J. Bot 45:142
    [Google Scholar]
  4. Colson B. 1934; The cytology and morphology of Neurospora tetrasperma Dodge.. Ann. Bot 48:211
    [Google Scholar]
  5. Dodge B. O. 1936; Spermatia and nuclear migrations in Pleurage anserina.. Mycologia 28:284
    [Google Scholar]
  6. Doguet G. 1960; Contribution à l’étude du noyau du Sordaria fimicola.. Rev. Cytol. Biol. veg 22:109
    [Google Scholar]
  7. Esser K., Kuenen R. 1965 Genetic der Pilze Berlin-Heidelberg-New York: Springer-Verlag.;
    [Google Scholar]
  8. Faull J. H. 1905; Development of the ascus and spore formation in Ascomycetes.. Proc. Boston Soc. nat. Hist 32:77
    [Google Scholar]
  9. Franke G. 1957; Die Cytologie der Ascusentwicklung von Podospora anserina.. Z. indukt. Abstamm.- u. VererbLehre 88:159
    [Google Scholar]
  10. Franke G. 1962; Versuche zur Genomverdoppelung des Ascomyceten Podospora anserina (Ces.) Rehm.. Z. VererbLehre 93:109
    [Google Scholar]
  11. Heslot H. 1958; Contribution à l’étude cytogénétique et génétique des Sordariacées.. Rev. Cytol. Biol. veg 19:1
    [Google Scholar]
  12. Kuenen R. 1962; Crossover- und Chromatiden-Interferenz bei Podospora anserina (Ces.) Rehm.. Z. VererbLehre 93:66
    [Google Scholar]
  13. McIntosh D. L. 1954; A Feulgen-carmine technique for staining fungus chromosomes.. Stain Technol 29:29
    [Google Scholar]
  14. Moreau F., Moreau MME. 1951; Observations cytologiques sur les Ascomycètes du genre Pleurage Fr.. Revue Mycol., Paris 16:198
    [Google Scholar]
  15. Rizet G., Engelmann C. 1949; Contribution à l’étude génétique d’un Ascomycète tetrasporé: Podospora anserina (Ces.) Rehm.. Rev. Cytol. Biol. veg II:202
    [Google Scholar]
  16. Robinow C. E., Marak J. 1966; A fibre apparatus in the nucleus of the yeast cell.. J. Cell Biol 29:129
    [Google Scholar]
  17. Schrantz J.-P. 1967; Presence d’un aster au cours des mitoses de l’asque et de la formation des ascospores chez l’Ascomycete Pustularia cupularis (L.) Fuck.. C. r. hebd. Seanc. Acad. Sci., Paris 264:1274
    [Google Scholar]
  18. Singleton J. R. 1953; Chromosome morphology and the chromosome cycle in the ascus of Neuro-spora crassa.. Am. J. Bot 40:124
    [Google Scholar]
http://instance.metastore.ingenta.com/content/journal/micro/10.1099/00221287-53-1-81
Loading
/content/journal/micro/10.1099/00221287-53-1-81
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error