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  • Antarctic  (5)
  • Pollen
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  • 1
    Electronic Resource
    Electronic Resource
    Male gametophytic selection in maize (1982)
    Springer
    Theoretical and applied genetics 63 (1982), S. 249-254 
    Details
    ISSN: 1432-2242
    Keywords: Maize ; Pollen ; Gametophytic selection ; Competitive ability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary There is evidence that male gametophyte selection is a widespread phenomenon in higher plants. The pollen tube growth rate is one of the main components of gametophyte selective value; genetic variability for this trait, due to the effect of single genes or to quantitative variation, has been described in maize. However, indication of gametophytic selection has been indirectly obtained; its effect was revealed by the positive relation observed between gametophyte competitive ability and sporophyte metrical traits. This paper considers the results of selection applied to gametophyte populations produced from single plants. The competitive ability of the lines was evaluated in comparison with that of a standard line by means of the pollen mixture technique. Sporophytic traits were measured in the hybrid progeny obtained by crossing selected S3 and S4 families with an unrelated single cross and an inbred line. Gametophyte selection produced inbred lines with high gametophyte competitive ability. In view of the selection procedure adopted, this result was interpreted as an indication of haploid expression of genes involved in the control of pollen tube growth. Moreover, this gametophytic trait was positively correlated with sporophytic traits (seedling weight, kernel weight and root tip growth in vitro), indicating that both groups of characters have a common genetic basis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00304004
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    Paper (German National Licenses)
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  • 2
    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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  • 3
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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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  • 4
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    On Clathrozoellidae (Cnidaria, Hydrozoa, Anthoathecatae), a new family of rare deep-water leptolids, with the description of three new species (2003)
    In:  Zoologische Verhandelingen vol. 345, pp. 281-296
    Details
    Publication Date: 2024-01-12
    Description: Three new species of Anthoathecatae (Cnidaria, Hydrozoa) of the rare genus Clathrozoella Stechow, 1921, Clathrozoella abyssalis spec. nov., C. bathyalis spec. nov. and C. medeae spec. nov., are described from New Zealand and Antarctic waters. Along with the previously known C. drygalskii (Vanh\xc3\xb6ffen, 1910) the genus Clathrozoella now numbers four species. Details of the skeleton, hydranths, nematocysts and gonophores are described and discussed, as is also the position of the newly established family Clathrozoellidae.
    Keywords: Hydrozoa ; Anthoathecatae ; Clathrozoellidae ; Clathrozoella ; Antarctic ; benthos ; new species
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 5
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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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  • 6
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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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  • 7
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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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