Zur Karyologie der Meiose des Lebermooses Sphaerocarpus Donnellii

Reitberger, Alois; Buchner, Erika

doi:10.1007/bf02568079

Cited by 11 publications

(2 citation statements)

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“…This nonchiasmatic pattern of sex chromosomes may be compared with the meiotic behaviour of autosomes in species with primitive types of maturation. Such a primitive non-chiasmatic association of autosomes possibly occurs in Sphaerocarpus [39,63,83,851, in which the nonchiasmatic end-to-end pairing of autosomes in mammals is replaced functionally by substances derived from elimination bodies (REIT-BERGER & BUCHNER, 1958). In this connection it is interesting that both the XY sex vesicle and the elimination bodies of mammals are high in RNA content.…”

Section: Heteropycnosis and Pairing Of Sex Chromosomesmentioning

confidence: 98%

Comparative studies on sex chromosomes in different species

Eberlé

1964

Genetica

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In Locusta migmtoria (XO), Mus musculus, Rattus •orvegicus, Mesocm-cetus auratus, Cvicetulus griseus and Homo sapiens typical sex vesicle structures are visible in early meiotic prophase stages up to pachynema. The structures include whole sex chromosomes or parts thereof. The heterologous parts and the solitary X chromosome of Locusta pass diplonema, diakinesis and first metaphase nearly in mitotic shape. Entirely heterologous sex chromosomes are kept together by a unilateral and achiasmatic end connection. The sex vesicle is interpreted as a special structure of allocyclic sex chromosomes or parts of them, corresponding in early meiotic stages to the chromocenters of mitotic interphase nuclei. The formation of the sex vesicle is independent of the orthoploidy of nuclei and of the DNA ratio between autosomes and sex chromosomes. Heteropycnotic behaviour of sex chromosomes ill spermatids is interpreted as a condition capable of blocking genetic activity, like in the Barr bodies of female somatic nuclei, giving equal chances of fertilization to both types of gametes.

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Section: Heteropycnosis and Pairing Of Sex Chromosomesmentioning

confidence: 98%

Comparative studies on sex chromosomes in different species

Eberlé

1964

Genetica

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“…Tag nach der Befruchtung, bei den iibrigen Versuchen unter anderen Kulturbedingungen erst urn den 25. Tag nach der Befruchtung start(REITBERGER und BUCHNER 1958).Die befruchteten Pflanzen kamen den Kulturbedingungen entsprechend zwischen dem zehnten und vierzehnten Tag in die Therrnostaten und hliehen dort mindestens his zur Differenzierung der vier Sporen in den Sporenmutterzellen. So befanden sich die Sporogone sicher wahrend der Meiose und sehr wahrscheinlich bereits mit Beginn der prameiorischen Interphase in den gewahlten Temperaturen.Allerdings war die Zahl der untersuchten Sporogone teilweise zu klein, urn die Moglichkeit einer, wenn auch geringen, Heterogenitat auszuschlieBen.…”

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12. W. O. Abel und Herta Rothe: Der Einfluß der Temperatur auf die Häufigkeit der Postreduktion bei dem Lebermoos Sphaerocarpus donnellii ¹

1964

Berichte der Deutschen Botanischen Gesellschaft

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Differentiation of Intracapsular Cells in the Sporophyte of Sphaerocarpos Donnellii

Kelley

Doyle

1975

American J of Botany

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Ultrastructural and histochemical changes during intracapsular cell differentiation in the premeiotic sporophyte of the liverwort Sphaerocarpos donnellii Austin were studied. From an initially undifferentiated meristematic tissue, spore mother cells and nutritive cells become differentiated. The first indications of ultrastructural differentiation into two cell types are the accumulation of lipid within spherosomes and the occurrence of plastid tubules in the presumptive spore mother cells. Once differentiated the two cell types are clearly distinguishable on the basis of cytoplasmic vacuolation, stored food reserve, and cell and nuclear size. The mature spore mother cell contains many spherosomes, small vacuoles, starch‐containing plastids, and a large central nucleus. The mature nutritive cell, on the other hand, is extremely vacuolate and contains large, starch‐filled plastids, a few spherosomes, and a small nucleus. A previously undescribed type of cell was observed in developing sporophyte capsules. This cell is located peripherally in the capsule and degenerates during differentiation of spore mother cells and nutritive cells.

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Zur Karyologie der Meiose des Lebermooses Sphaerocarpus Donnellii

Cited by 11 publications

References 10 publications

Comparative studies on sex chromosomes in different species

Comparative studies on sex chromosomes in different species

12. W. O. Abel und Herta Rothe: Der Einfluß der Temperatur auf die Häufigkeit der Postreduktion bei dem Lebermoos Sphaerocarpus donnellii ¹

Differentiation of Intracapsular Cells in the Sporophyte of Sphaerocarpos Donnellii

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Zur Karyologie der Meiose des Lebermooses Sphaerocarpus Donnellii

Cited by 11 publications

References 10 publications

Comparative studies on sex chromosomes in different species

Comparative studies on sex chromosomes in different species

12. W. O. Abel und Herta Rothe: Der Einfluß der Temperatur auf die Häufigkeit der Postreduktion bei dem Lebermoos Sphaerocarpus donnellii 1

Differentiation of Intracapsular Cells in the Sporophyte of Sphaerocarpos Donnellii

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12. W. O. Abel und Herta Rothe: Der Einfluß der Temperatur auf die Häufigkeit der Postreduktion bei dem Lebermoos Sphaerocarpus donnellii ¹