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  • Hydrozoa  (6)
  • Gametophytic selection  (3)
  • 1995-1999  (8)
  • 1980-1984  (1)
Collection
Keywords
Publisher
Years
Year
  • 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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  • 2
    Electronic Resource
    Electronic Resource
    Identification of genetic factors for alachlor tolerance in maize by molecular markers analysis (1996)
    Springer
    Molecular genetics and genomics 251 (1996), S. 551-555 
    Details
    ISSN: 1617-4623
    Keywords: Key words Maize ; Herbicide ; Molecularmarkers ; Gametophytic selection ; Linkage analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Genetic factors controlling tolerance to the herbicide Alachlor in maize were localised by means of two different strategies. In the first approach, backcross (BC) plants, derived from pollen which had been subjected to selective pressure for resistance to the herbicide, were analysed for segregation distortion at 47 RFLP loci and compared to BC plants obtained from non-selected pollen. Preferential transmission of five chromosomal regions where putative QTLs (Quantitative Trait Loci) are localised was revealed in the BC plants from selected pollen. A second approach was based on a classical linkage analysis for segregation of the same set of RFLPs and factors controlling the trait, in a BC population of 210 individuals, by means of regression analysis. This study detected seven significant loci in four genomic regions. Overall, two loci revealed both segregation distortion and association with the expression of the trait, indicating linkage to genes expressed in both gametophytic and sporophytic phase. Three chromosomal regions appeared to carry factors involved in plant tolerance to Alachlor which are not expressed in pollen. Conversely, three loci were linked to factors selectable in pollen, but did not reveal significant association with tolerance in the plant in the segregating populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02173644
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  • 3
    Electronic Resource
    Electronic Resource
    Identification of genetic factors for alachlor tolerance in maize by molecular markers analysis (1996)
    Springer
    Molecular genetics and genomics 251 (1996), S. 551-555 
    Details
    ISSN: 1617-4623
    Keywords: Maize ; Herbicide ; Molecular markers ; Gametophytic selection ; Linkage analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Genetic factors controlling tolerance to the herbicide Alachlor in maize were localised by means of two different strategies. In the first approach, backcross (BC) plants, derived from pollen which had been subjected to selective pressure for resistance to the herbicide, were analysed for segregation distortion at 47 RFLP loci and compared to BC plants obtained from non-selected pollen. Preferential transmission of five chromosomal regions where putative QTLs (Quantitative Trait Loci) are localised was revealed in the BC plants from selected pollen. A second approach was based on a classical linkage analysis for segregation of the same set of RFLPs and factors controlling the trait, in a BC population of 210 individuals, by means of regression analysis. This study detected seven significant loci in four genomic regions. Overall, two loci revealed both segregation distortion and association with the expression of the trait, indicating linkage to genes expressed in both gametophytic and sporophytic phase. Three chromosomal regions appeared to carry factors involved in plant tolerance to Alachlor which are not expressed in pollen. Conversely, three loci were linked to factors selectable in pollen, but did not reveal significant association with tolerance in the plant in the segregating populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02173644
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  • 4
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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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  • 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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    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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  • 8
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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
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  • 9
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    Phylogenetic analysis of the Antarctic genus Oswaldella Stechow, 1919 (Hydrozoa, Leptomedusae, Kirchenpaueriidae) (1999)
    In:  Contributions to Zoology vol. 68 no. 2, pp. 83-93
    Details
    Publication Date: 2024-01-12
    Description: A cladistic study was carried out on known species of the characteristically Antarctic genus Oswaldella, adopting as outgroups some other genera included in the family Kirchenpaueriidae. The analysis resulted in a cladogram with low CI in which no relationship between genera can be depicted. However, the hypothesis of monophyly of the genus Oswaldella is corroborated, being supported in our cladogram by five synapomorphies (although all are homoplastic with other taxa or reversed within the species of the genus). The basal relationships of the genus are uncertain, but three species groups are distinguishable within Oswaldella: 1) the O. incognita group, 2) the O. antarctica group, and 3) a clade formed by (O. garciacarrascosai, O. elongata ( O. blanconae (O. gracilis O. herwigi, Oswaldella sp. two)))).
    Keywords: Hydrozoa ; Kirchenpaueriidae ; Oswaldella ; Antarctica ; systematics ; cladistics
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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