Post-meiotic events in boleti

Duncan, Elliott G.

doi:10.1016/s0007-1536(70)80150-4

Cited by 17 publications

(3 citation statements)

References 10 publications

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“…The pattern of nuclear behavior during sporulation of P. eryngii corresponded to the pattern C nuclear behavior as defined by Duncan and Galbraith (1972): a single postmeiotic nuclear division occurs in each basidiospore while it is still attached to the sterigma, and then one of the two daughter nuclei moves back to the basidium. The present observation did not agree with the previous report describing the three species of the P. eryngii complex to have pattern A nuclear behavior (Slézec 1984).…”

Section: Discussionmentioning

confidence: 64%

Isolation and characterization of a sporeless mutant in Pleurotus eryngii

et al. 2003

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A sporeless mutant dikaryon, completely defective in sporulation, was isolated from mycelial protoplasts of Pleurotus eryngii mutagenized by UV irradiation. Newly established dikaryons between one component monokaryon from the mutant, and 12 different wild type monokaryons from 3 other wild type dikaryons, all exhibited the sporeless phenotype, whereas those between the other monokaryon and the same wild type monokaryons all produced normal fruiting bodies. These results indicated that the sporeless mutation was induced in one of two nuclei of the mutant and was dominant. In the wild type basidia, the pattern of nuclear behavior during sporulation corresponded to the pattern C nuclear behavior as defined by Duncan and Galbraith. Cytological observation revealed that in the sporeless mutant meiosis was blocked at the meta-anaphase I in most basidia and hence basidiospores and sterigmata were not produced. Although fruiting bodies of the sporeless mutant showed a somewhat leaning growth, their gross morphology and its fruiting body productivity were comparable to that of the original wild type strain. Based on these results, it was considered that the sporeless mutant could serve as a potential material in breeding of sporeless P. eryngii commercial strains.

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Section: Discussionmentioning

confidence: 64%

Isolation and characterization of a sporeless mutant in Pleurotus eryngii

et al. 2003

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“…During basidiospore formation in some Homobasidiomycetes post-meiotic nuclei performing a mitosis move through the sterigmata into the spores. The extrusion of nucleoli by the post-meiotic nuclei was considered to be a necessary spatial diminution for nuclear migration through the sterigmata (Duncan, 1970). However, there are other patterns of nuclear behavior in which the third nuclear division takes place within the basidiospores (Duncan…”

Section: Discussionmentioning

confidence: 99%

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

Bauer

Oberwinkler

1988

Botanica Acta

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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.

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“…meiotic nucleus remained within the sterigma. Later Duncan (1970) established that the nucleolus was extruded by the migrating post-meiotic nucleus as the latter moved into the basidiospore in a number of species of Boletus.…”

Section: Introductionmentioning

confidence: 99%

Nucleolar behaviour during division in the homobasidiomycetidae

Galbraith

Duncan

1972

Transactions of the Botanical Society of Edinburgh

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The nueleoli of Oudemansiella mucida and Nolanea cetrata become disassociated from the parent ehromatin during both mitosis and meiosis. Disassociation of the nueleoli from the post-melotic nuclei at the onset of migration is taken, along with other evidence, to indicate that the third nuclear division is initiated in the basidium and completed in the basidiospores. It is postulated that the coincidence of migration and the third nuclear division arises from the inability of nucleoli to pass through the sterigmata. This view is supported by observations made by the authors on other members of the Homobasidiomycetidae.

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Post-meiotic events in boleti

Cited by 17 publications

References 10 publications

Isolation and characterization of a sporeless mutant in Pleurotus eryngii

Isolation and characterization of a sporeless mutant in Pleurotus eryngii

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

Nucleolar behaviour during division in the homobasidiomycetidae

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