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  • Cnidaria  (5)
  • Male sterility  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    A multi-nucleate male-sterile mutant of maize with gametophytic expression (1997)
    Springer
    Sexual plant reproduction 10 (1997), S. 22-26 
    Details
    ISSN: 1432-2145
    Keywords: Key words Maize ; Pollen ; Male sterility ; Gametophytic mutants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  In order to dissect the complex genetic system that controls pollen development, we have undertaken a program of transposon insertion mutagenesis, with the purpose of producing mutations in gametophytically acting genes that are important for this process. The present work reports the developmental cytology of one of the mutants isolated, gaMS-2 (gametophytic male sterile-2). A peculiar feature of the mutant grains was lack of differentiation between the vegetative and the generative nuclei, leading to alteration in number, conformation and placement of nuclei. At anthesis, the grains carrying the mutant allele are about 40% of the normal grain size, contain a very reduced amount of starch and exhibit various nuclear abnormalities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004970050063
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    gaMS-1: a gametophytic male sterile mutant in maize (1996)
    Springer
    Sexual plant reproduction 9 (1996), S. 216-220 
    Details
    ISSN: 1432-2145
    Keywords: Key words Maize pollen ; Male sterility ; Microsporogenesis ; Gametophytic gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Several pollen-specific genes from different species have been isolated and characterized at the molecular level, but the precise role of most of them is unknown. Mutant analysis represents a direct approach to uncovering gene function, but the paucity of available mutants affecting pollen development and/or function and the poor characterization of the known mutants have so far limited the exploitation of this approach. Here we present the cytological characterization of gametophytic male sterile-1 (gaMS-1), a maize mutant that we identified in a program of transposon insertion mutagenesis for the production of mutations in gametophytically acting genes involved in microsporogenesis. gaMS-1 is expressed during or immediately after the first microspore division and leads to the production of immature, non-functional pollen grains. The mutation appears to affect the events leading to the developmental switch that follows the first microspore mitosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004970050034
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  • 3
    Electronic Resource
    Electronic Resource
    gaMS-1: A gametophytic male sterile mutant in maize (1996)
    Springer
    Sexual plant reproduction 9 (1996), S. 216-220 
    Details
    ISSN: 1432-2145
    Keywords: Maize pollen ; Male sterility ; Microsporogenesis ; Gametophytic gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several pollen-specific genes from different species have been isolated and characterized at the molecular level, but the precise role of most of them is unknown. Mutant analysis represents a direct approach to uncovering gene function, but the paucity of available mutants affecting pollen development and/or function and the poor characterization of the known mutants have so far limited the exploitation of this approach. Here we present the cytological characterization ofgametophytic male sterile-1 (gaMS-1), a maize mutant that we identified in a program of transposon insertion mutagenesis for the production of mutations in gametophytically acting genes involved in microsporogenesis.gaMS-1 is expressed during or immediately after the first microspore division and leads to the production of immature, nonfunctional pollen grains. The mutation appears to affect the events leading to the developmental switch that follows the first microspore mitosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02173101
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  • 4
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    Oswaldella vervoorti spec. nov. (Cnidaria: Hydrozoa), a new benthic hydroid from the South Shetland Islands, Antarctica (1998)
    In:  Zoologische Verhandelingen vol. 323 no. 15, pp. 175-180
    Details
    Publication Date: 2024-01-12
    Description: Oswaldella vervoorti spec. nov., a new antarctic hydroid is described and depicted. The differences and similarities with allied species in the genus, known only from the antarctic region, are discussed.
    Keywords: Cnidaria ; Hydrozoa ; hydroids ; Kirchenpaueriidae ; Oswaldella ; new species ; Antarctica.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 5
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    Redescription of Schizotricha anderssoni Jaderholm, 1904 (Cnidaria: Hydrozoa) with the description of a new species. Notes on antarctic hydroids, 4 (1996)
    In:  Zoologische Mededelingen vol. 70 no. 14, pp. 217-226
    Details
    Publication Date: 2024-01-12
    Description: The type series of Schizotricha anderssoni J\xc3\xa4derhoim, 1904, collected by the Swedish Antarctic Expedition 1901-1903 and deposited in the collections of the Swedisch National Museum, Stockholm, is redescribed. The type series is composed of two species, the species figured by J\xc3\xa4derhoim (1905) is designated the lectotype of Schizotricha anderssoni. The second species, differing from the other species of the genus, is described as Schizotricha jaederholmi spec. nov.
    Keywords: Cnidaria ; Hydrozoa ; hydroids ; Schizotricha ; new species ; Antarctic
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 6
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    On two new species of Oswaldella Stechow, 1919: O. terranovae spec. nov. and O. tottoni spec. nov. (Cnidaria: Hydrozoa). Notes on Antarctic hydroids, III (1996)
    In:  Zoologische Mededelingen vol. 70 no. 8, pp. 135-143
    Details
    Publication Date: 2024-01-12
    Description: The material assigned by Totton (1930) to Oswaldella antarctica (Jaderholm, 1904) and O. bifurca (Hartlaub, 1904) has been re-examined and redescribed. This material shows such important differences with Hartlaub\'s and J\xc3\xa4derholm\'s species and the remaining species of Oswaldella that they are here considered as two new species: O. terranovae spec. nov. and O. tottoni spec, nov., respectively.
    Keywords: Cnidaria ; Hydrozoa ; hydroids ; Oswaldella ; new species ; Antarctic
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 7
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    Species of Schizotricha Allman, 1883 (Cnidaria, Hydrozoa) from recent antarctic expeditions with R.V. \'Polarstern\', with the description of a new species (1996)
    In:  Zoologische Mededelingen vol. 70 no. 28, pp. 411-435
    Details
    Publication Date: 2024-01-12
    Description: Five species of the genus Schizotricha Allman, 1883, one of which is new to science, have been studied.\nThe material originates from the Weddell Sea region and from off Elephant Island and it was collected during several antarctic expeditions with the R.V. Tolarstern\'. Each species is described and figured and its systematic position among allied species discussed. The type material of Schizotricha glacialis (Hickson & Gravely, 1907) and S. turqueti Billard, 1906 has been re-examined and is also described and figured.
    Keywords: Cnidaria ; Hydrozoa ; hydroids ; Schizotricha ; Antarctic ; re-description of species ; new records ; new species
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 8
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    On Oswaldella billardi Briggs, 1938 and O. erratum spec, nov., two antarctic hydroid species (Cnidaria, Hydrozoa) (1997)
    In:  Zoologische Mededelingen vol. 71 no. 22, pp. 269-276
    Details
    Publication Date: 2024-01-12
    Description: The type material of Oswaldella billardi Briggs, 1938, has been re-examined and a complete description and figures are presented. The study of that material has allowed to reconsider the systematic position of all the material previously assigned to O. billardi and to determine that part of it belongs to another species. Since it is clearly different from the remaining species of the genus, it is described as Oswaldella erratum spec. nov.\nResumen: Se ha revisado y redescrito el material tipo de Oswaldella billardi Briggs, 1938. Su estudio ha permitido reconsiderar la posici\xc3\xb3n sistem\xc3\xa1tica de todo el material anteriormente asignado a O. billardi y, as\xc3\xad, determinar que parte del mismo pertenece a otra especie. Ya que dicha especie es claramente diferente de las otras especies del g\xc3\xa9nero, se describe como Oswaldella erratum spec. nov.
    Keywords: Cnidaria ; Hydrozoa ; hydroids ; Oswaldella ; new species ; Antarctic
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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