Intranuclear spindles and reduction of the nuclear volume during meiosis in Coprinus radiatus (Bolt) Fr.

Thielke, Ch.

doi:10.1007/bf00425285

Cited by 23 publications

(5 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The possibility of numbers per kinetochore above three can be fairly certainly eliminated, but because the kinetochore terminations are not clearly differentiated, lower figures are possible. This number of microtubules per kinetochore compares with the two or more reported in another Basidiomycete genus Coprinus (22,39), but is high relative to the one found in most fungi (see review of Heath, reference 13).…”

mentioning

confidence: 49%

Ultrastructure of mitosis in the cowpea rust fungus Uromyces phaseoli var. Vignae.

Heath¹,

Heath²

1976

The Journal of Cell Biology

View full text Add to dashboard Cite

Aspects of the ultrastructure of mitotic nuclei of the fungus Uromyces phaseoli var. vignae are described from both intercellular hyphae in the cowpea host and infection structures induced to differentiate in vitro. The interphase nucleusassociated organelle (NAO) consists of two trilamellar acircular disks connected by an osmiophilic bar. The intranuclear spindle develops between these disks when they separate. The spindle contains pole to pole, interdigitating, chromosomal, and fragmentary microtubules arranged to form a central bundle along the surface of which lie the metaphase chromosomes. No metaphase plate is found. There are up to three microtubules per kinetochore and approximately 14 chromosomes on the haploid spindle. Telophase elongation appears to involve extension of pole to pole microtubules with no evidence for the remaining presence of interdigitating microtubules. Concomitantly, numerous cytoplasmic microtubules develop from each NAO disk where few or none are present in other phases. Reformation of the interphase NAO involves the formation of a sausage-shaped intermediate at late telophase. The nuclear envelope remains intact and the nucleolus persists throughout division. Various aspects of the spindle and NAOs appear to be evolutionary intermediates between Ascomycetes and higher Basidiomycetes, thus supporting the theory of Basidiomycete evolution from the former group and demonstrating an encouraging correlation between mitotic characteristics and other phylogenetic markers.

show abstract

mentioning

confidence: 49%

Ultrastructure of mitosis in the cowpea rust fungus Uromyces phaseoli var. Vignae.

Heath¹,

Heath²

1976

The Journal of Cell Biology

View full text Add to dashboard Cite

show abstract

“…(Reproduced from reference 359 by kind permission of D. Zickler and Chromosoma. ) radiatus (326). The latter report is especially intriguing, as a previous investigation (188) of the same species had shown that the nuclear envelope broke down during metaphase and reformed in telophase.…”

Section: Figmentioning

confidence: 86%

“…8, 9). In Coprinus radiatus the SPBs are present outside the nuclear envelope early in prophase I but then penetrate the nuclear envelope and form the poles of the intranuclear spindle (326).…”

mentioning

confidence: 99%

Meiosis in protists. Some structural and physiological aspects of meiosis in algae, fungi, and protozoa.

Heywood¹,

Magee²

1976

Bacteriological Reviews

View full text Add to dashboard Cite

“…The initial stages of degeneration are similar to the beginning of a basidiomycetous nuclear division. Condensation of chromatin and reduction of nuclear volume have been reported several times (Girbardt, 1961;Thielke, 1972Thielke, , 1974. During mitotis in Bullera alba nuclear volume is reduced to 1/12th of that of the somatic nucleus (Taylor and Wells, 1978).…”

Section: Discussionmentioning

confidence: 98%

Nuclear Degeneration during Ballistospore Formation of Cronartium asclepiadeum (Uredinales)*

Bauer

Oberwinkler

1988

Botanica Acta

View full text Add to dashboard Cite

When basidia of Cronartium asclepiadeum (Uredinales) develop basidiospores, nuclei migrate from the basidial cells into the basidiospores. A mitotic nuclear division yields two nuclei in the basidiospore. One of these nuclei degenerates if the basidiospore develops a secondary ballistospore. Several stages in the degeneration of the nuclei can be recognized: (1) Condensation of chromatin, (2) separation of the nucleus into a portion containing the chromatin and a portion containing the nucleoplasm by an invagination of the nuclear envelope, (3) reduction of nuclear volume, (4) enveloping and (5) twisting of nuclear membranes around the degenerating nucleus, (6) homogenization of the chromatin with reduction of the nuclear envelope, and reduction of the enclosing membrane complex from a multilamellar structure to a single membrane layer, and (7) invagination or splitting off of the spiralled membranes. The nuclear behavior during early developmental stages of secondary spore formation is similar to that of budding basidiomycetous yeasts. Basidiomycetes producing ballistospores may possibly have arisen from those whose reproducing phase is yeast‐like.

show abstract

Intranuclear spindles and reduction of the nuclear volume during meiosis in Coprinus radiatus (Bolt) Fr.

Cited by 23 publications

References 23 publications

Ultrastructure of mitosis in the cowpea rust fungus Uromyces phaseoli var. Vignae.

Ultrastructure of mitosis in the cowpea rust fungus Uromyces phaseoli var. Vignae.

Meiosis in protists. Some structural and physiological aspects of meiosis in algae, fungi, and protozoa.

Nuclear Degeneration during Ballistospore Formation of Cronartium asclepiadeum (Uredinales)*

Contact Info

Product

Resources

About