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  • 1985-1989  (6)
  • Pollen  (4)
  • Microspore mother cell  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Cytokinesis in microspore mother cells of Impatiens sultani (1988)
    Springer
    Sexual plant reproduction 1 (1988), S. 228-233 
    Details
    ISSN: 1432-2145
    Keywords: Microspore mother cell ; Cytokinesis ; Impatiens sultani ; Cell plate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Cytokinesis in Impatiens sultani microspore mother cells is simultaneous. It starts with the formation of small ingrowths of the surrounding callosic wall. Next, an incomplete cell plate is formed by fusion of small dictyosome vesicles. The cell plate consists of a network of anastomosing tubules and sacs. Aggregates of fusing vesicles are associated with bundles of microtubules, which are oriented perpendicular to the plane of the future cell walls. In the sacculate parts of the cell plate, some callose is deposited, while the associated microtubules disappear. The cell walls ultimately develop by enlargement of the previously formed wall ingrowths, which successively incorporate the elements of the cell plate. The enlargement and thickening of the walls is not accompanied by a further fusion and incorporation of dictyosome vesicles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189157
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  • 2
    Electronic Resource
    Electronic Resource
    Cytoskeletal changes during generative cell division and sperm formation inTradescantia virginiana (1989)
    Springer
    Protoplasma 150 (1989), S. 54-71 
    Details
    ISSN: 1615-6102
    Keywords: Generative cell ; Microtubules ; Mitosis ; Cytokinesis ; Pollen ; Sperm ; Tradescantia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Cytoskeletal organization and chromosome behavior were studied inTradescantia generative cells prior to and during sperm formation using in vitro grown pollen tubes and fluorescence staining methods. Before pollen germination, the crescent-shaped generative cell contains a reticulate microtubule (Mt) system. The cell elongates dramatically after germination, and its Mts assume a helical to longitudinal arrangement. Chromosome condensation is evident approximately 3hr after germination. Kinetochores appear as dark interruptions in the Mt array, and thus seem to attach directly to interphase fibers. No metaphase plate typical of other cells is observed with either DAPI or anti-tubulin staining. Instead, the chromosomes adopt a twisted or braided arrangement, with kinetochores distributed along the length of the cell and kinetochore fibers linked to each other and to surrounding fibers. Anaphase is characterized by a staggered, overlapping separation of chromosomes and by elongation of Mt branches connecting opposing kinetochore fibers. Cytokinesis appears to utilize a furrowing process; a phragmoplast or cell plate was never seen. As a result of these events, the sperm directly inherit their cytoskeleton from generative cell Mts involved in division. No actin fibers are observed at any stage using rhodamine-phalloidin staining. The results are discussed in terms of other reports on sperm formation, possible mitotic and cytokinetic mechanisms, and past distinctions between Mt arrays in higher plant somatic cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01352921
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Microtubule organization in the sperm ofTradescantia virginiana (1988)
    Springer
    Protoplasma 146 (1988), S. 28-34 
    Details
    ISSN: 1615-6102
    Keywords: Generative cell ; Microtubule ; Sperm ; Pollen ; Tradescantia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Microtubules were visualized in the sperm ofTradescantia virginiana pollen tubes grownin vitro and processed for antitubulin immunocytochemistry. The sperm contain thick microtubule bundles from which emerge numerous branches of various dimensions disposed longitudinally and helically along the cell axis. Sperm are usually spindle or cigar-shaped, but cells of various sizes and shapes can be found. All contain microtubule arrays. No F-actin was detected in sperm using rhodamine-phalloidin staining. Sperm microtubules are discussed in terms of their potential roles in cell shaping and motility and their origin during generative cell division.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01354292
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Cytoplasmic differentiation during tetrad formation and early microspore development inImpatiens sultani (1989)
    Springer
    Protoplasma 148 (1989), S. 1-7 
    Details
    ISSN: 1615-6102
    Keywords: Microspore mother cell ; Microspore ; Impatiens sultani ; Cytoplasm ; Organelles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary From early prophase stage until probaculae formation within the tetrad stage considerable cytoplasmic changes occur. The changes merely concern the ribosome population, the plasma matrix and, the endomembrane system formed by endoplasmic reticulum, dictyosomes and dictyosome-vesicles. The ultrastructure and morphology of mitochondria and plastids remain fairly unchanged, apart from the mobilization of starch during primexine formation. During meiotic prophase there is an increase in ribosome number, accompanied by the presence of nucleoloids in the cytoplasm. Simultaneously the electron density of the cytoplasm strongly increases, indicating a fair increase in protein content. Nucleoloids are also observed in the cytoplasm after primexine formation, accompanied by localized accumulation of ribosomes. Up to the individualization of the microspores the dictyosomes are in an inactive state. After that, they become very active, especially during primexine formation when numerous large dictyosome-vesicles are present. The endoplasmic reticulum (ER), initially in a plate-like configuration, disappears from the cytoplasm during primexine formation. Abundant, smooth and tubular ER is present when probaculum formation starts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01403985
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  • 5
    Electronic Resource
    Electronic Resource
    Origin of sperm cell association in the “male germ unit” ofBrassica pollen (1989)
    Springer
    Protoplasma 149 (1989), S. 1-4 
    Details
    ISSN: 1615-6102
    Keywords: Brassica napus ; Cell division ; Male germ unit ; Pollen ; Sperm cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The association of the two sperm cells inBrassica napus pollen following the generative cell division was investigated. The generative cell during division is located in the center of the pollen grain, within the vegetative cell. The space present between the two cells is slightly irregular as seen following standard glutaraldehyde fixation. After completion of mitosis vesicles appear in the equatorial plane, coalescing centripetally to form a cell plate which fuses with the membrane of the generative cell, dividing it in two sperm cells. They are isolated from the vegetative cell by the space between the two cell membranes and are separated from each other by a similar space resulting from the cell plate formed during cytokinesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01623975
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrastructure of the vegetative cell ofBrassica napus pollen with particular reference to microbodies (1989)
    Springer
    Protoplasma 152 (1989), S. 22-28 
    Details
    ISSN: 1615-6102
    Keywords: Brassica napus ; Vegetative cell ; Microbodies ; Pollen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ultrastructure of the vegetative cell ofBrassica napus tricellular pollen grains, just before anthesis with standard chemical fixation, is reported. The vegetative cell may be regarded as a highly differentiated and metabolically active fat-storage cell. It contains many mitochondria with a well developed internal membrane system, starchless plastids, microbodies, lipid bodies, dictyosomes and numerous vesicles thought to originate from the dictysomes. Rough endoplasmic reticulum organized in stacks of cisternae is also spatially associated with certain organelles, mainly lipid bodies, microbodies and plastids. There are also randomly distributed polyribosome areas. The microbodies are mainly polymorphic in shape and are often observed in contact with lipid bodies. The above spatial relationship implies that the microbodies may have a glyoxysomal function. In the late period of vegetative cell maturation, the microbodies are probably involved in the process of glyconeogenesis in which the conversion of lipid reserves to sugar takes place.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01354236
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