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Tuesday, July 21, 2020 | History

2 edition of Meiosis in the basidium of two agaricaceae found in the catalog.

Meiosis in the basidium of two agaricaceae

J. Lewis Allison

Meiosis in the basidium of two agaricaceae

Amanita panterian Fries and Coprinus fimetarius var. machrorhiza Fries.

by J. Lewis Allison

  • 262 Want to read
  • 18 Currently reading

Published .
Written in English

    Subjects:
  • Agaricaceae.,
  • Plant embryology.,
  • Karyokinesis.,
  • Chromosomes.

  • The Physical Object
    Pagination15 l.
    Number of Pages15
    ID Numbers
    Open LibraryOL16720037M

    Key words: Volvariella volvaceae, rice-straw m ushroom, sporophore, basidium, karyokinesis, meiosis and post-meiotic mitosis. uction Volvariella volvacea (Bull, ex. Fr.) Sin g commonly. Some species form only two spores per basidium, but that also varies. Following meiosis, mitotic divisions can occur in the basidium. Multiple numbers of basidiospores can be formed, including odd numbers due to degeneration of nuclei, pairing up of nuclei, or lack of migration of nuclei.

      How meiotic cycle and mating differentiation program are genetically and developmentally integrated to safeguard successful meiotic sporulation remains poorly known. In C. neoformans, sporulation occurs following two parallel events, meiosis and differentiation of specialized cell termed basidium. A basidium (pl., basidia) is a microscopic, spore producing structure found on the hymenophore of fruiting bodies of basidiomycete fungi. The presence of basidia is one of the main characteristic features of the Basidiomycota. A basidium usually&#;.

    a basidium of a fungus in the Basidiomycota. Basidium (singular), Basidia (plural) A specialized club-shaped reproductive cell of fungi in the Basidiomycota in which meiosis occurs and basidiospores are produced. Black yeasts¼microcolonial yeasts¼meristematic yeasts A polyphyletic assemblage of darkly pigmented extremophilic yeasts. germinate, meiosis to occur and vegetative haploid cells to be released - Diploid reproductive stage: created by fusion of haploid cells 2) Ascospores - Formed inside ascus, an elongated saclike cell - 2 haploid nuclei fuse to form a diploid nucleus then divide by meiosis to for 4 haploid nuclei, then divide by mitosis to form 8 haploid.


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Meiosis in the basidium of two agaricaceae by J. Lewis Allison Download PDF EPUB FB2

Sterigmata formation, spore maturation, spore discharge, and color change were observed ().Observation revealed the occurrence of stages from karyogamy, meiosis, post-meiotic mitosis, and nuclear migration events to spore formation ().After differentiation into a basidium, two nuclei approach one another and fuse to a diploid : Fu-Chia Chen, Norihiro Shimomura, Takeshi Yamaguchi, Tadanori Aimi.

In the basidium, nuclei of two different mating strains fuse (karyogamy), giving rise to a diploid zygote that then undergoes meiosis. The haploid nuclei migrate into basidiospores, which germinate and generate monokaryotic hyphae. The mycelium that results is called a primary mycelium.

Meiosis and post-meiotic mitosis took place in the center of the basidium. Sterigmata appeared when the first meiotic division occurred, and the center of the basidium. Introduction. Since the first discovery of meiosis in the late ’s in sea urchin eggs, the fundamental genetic features of meiosis have proven to be virtually universal for sexual reproduction throughout the Eukarya ically, a typical meiosis involves one round of genome duplication, followed by pairing and crossing-over between homologous chromosomes and two rounds of Cited by: Abstract.

The basidium is the organ in which karyogamy and meiosis occur and on which the meiospores (i.e., basidiospores) are developed. The structure of the mature meiosporangium (i.e., basidium) seems to be evolutionarily conservative; therefore, morphological similarities of the meiosporangia in the major taxa are believed to indicate varying degrees of relationships between Cited by: The club-shaped basidium carries spores called basidiospores.

In the basidium, nuclei of two different mating strains fuse (karyogamy), giving rise to a diploid zygote that then undergoes meiosis. The haploid nuclei migrate into basidiospores, which germinate and generate monokaryotic hyphae.

Karyogamy takes place in basidium and it is immediately followed by meiosis giving rise to four haploid basidiospores. The basidiospores are borne on sterigmata. The subterranean mycelial strands called rhizomorphs posssess dense knots of dikaryotic hyphae.

These knots develop into Basidiocarps. The meiosis I spindle extended between two monoglobular, disc-containing spindle pole bodies. During interphase I and II, septa lacking pores divided the basidium between daughter nuclei.

In interphase I, a putative new spindle pole body appeared between the nuclear envelope and the monoglobular spindle pole body residual from the first division. of meiosis, the synkaryon enters the first stage or 'interphase' of the division­ cycle and enlarges considerably and in the following prophase almost attains the width of the basidium (Fig.

1, d). Delicate reticulum, beaded at places. Basidium and Sterile Elements Basidium. The basidium is a clublike structure with 2–4 apical sterigmata that bear basidiospores. It is usually entire but is divided longitudinally in Auriculariales and Platygloeales.

Phragmobasidium. A phragmobasidium is a basidium divided into separate cells following meiosis, as in Auriculariales and. A single meiosis occurs in each basidium of C.

neoformans: To examine the meiotic process during conventional mating, crosses were set up between the M and JF99 parents. Using a microscope for guidance, a micromanipulation needle was used to lift as much as possible of the chains produced from a single basidium (Figure 1). In the basidium, nuclei of two different mating strains fuse (karyogamy), giving rise to a diploid zygote that then undergoes meiosis.

The haploid nuclei migrate into four different chambers appended to the basidium, and then become basidiospores. Each basidiospore germinates and generates monokaryotic haploid hyphae.

lagopus is that two pairs of independently segregating Mendelian factors are involved. The fusion nucleus in the basidium bears the complete set of sex factors (Aa Bb). If disjunction occurs in a basidium during the first division of meiosis, that basidium forms four spores which fall into two sex.

In the gills of the fruiting body, some cells undergo fusion of these two nuclei. These now diploid cells are the basidia. The diploid phase is very brief. Soon after fusion, meiosis takes place, resulting in four haploid nuclei.

The nuclei then migrate to the terminus of the basidium. The club-shaped basidium carries spores called basidiospores. In the basidium, nuclei of two different mating strains fuse (karyogamy), giving rise to a diploid zygote that then undergoes meiosis.

The haploid nuclei migrate into basidiospores, which germinate and generate monokaryotic hyphae. The mycelium that results is called a primary mycelium.

Each sprouts into a haploid hypha, a threadlike strand of fungus. This is the gametophyte stage of the life cycle. Two hyphae will fuse and join their chromosomes into a diploid zygote, which.

The double centrosome in the basidium of Boletus rubinellus has been observed in three planes with the electron microscope at interphase preceding nuclear fusion, at prophase I, and at interphase I.

It is composed of two components connected by a band-shaped middle part. At anaphase I a single, enlarged centrosome is found at the spindle pole, which is attached to the cell membrane.

Nuclear division in basidia of Poria latemarginata was studied comparatively by light and electron microscopy. Premeiotic mitosis occurred in the lower half of the basidium and was oriented paralle.

The heterothallic basidiomycetous fungus Cryptococcus neoformans has two mating types, MATa and MAT Morphological progression of bisexual reproduction in C. neoformans is as follows: yeast to hyphal transition, filament extension, basidium formation, meiosis, and sporulation.

neoformans Cdk-related kinase 1 (CRK1) is a negative regulator of bisexual mating. Spores are generally produced through sexual reproduction, rather than asexual reproduction.

The club-shaped basidium carries spores called basidiospores. In the basidium, nuclei of two different mating strains fuse (karyogamy), giving rise to a diploid zygote that then undergoes meiosis.

The two division of meiosis that occur in the distal portion of the basidia ofPholiota terrestris were studied with light and electron microscopy. A diglobular spindle pole body (SPB), consisting of two globular elements and a connecting, electron-dense middle piece, is closely attached to the nuclear envelope of the fusion nucleus.

During prometaphase I the globular elements separate and pass.(C). Meiosis: reduction division (A). Plasmogamy. Ø Plasmogamy is the first phase of sexual reproduction in fungi. Ø It is the fusion of protoplasts of two compatible gametes or sex cells or hyphae.

Ø As a result of plasmogamy, two compatible nuclei are come close to each other (B). Karyogamy. Ø Fusion of two nuclei to form a diploid nucleus.The diploid nucleus divides to form four meiotic products called basidiospores that, unlike in Ascomycotina, are abjected outside from a tube-like or a club-shaped basidium (Figure A3).

Example: Agaricus bisporus (Figure A4), Puccinia graminis (Figure A5).