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  • 1
    Electronic Resource
    Electronic Resource
    The Floral Biology of Duchesnea (Rosaceae) (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Plant species biology 11 (1996), S. 0 
    Details
    ISSN: 1442-1984
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Pollinators and UV photos of flowers of Duchesnea chrysantha and D. indica are discussed. The petals of D. chrysantha reflect UV light strongly, while those of D. indica have a nectar guide appearing as a spot at the base of the petals that absorbs UV light. This is the same as in Potentilla which is closely related taxonomically. In Duchesnea, we consider the presence of a nectar guide to be a derived character. The petals of D. chrysantha and D. indica are distinguished by the presence or absence of nectar guides, but both species are pollinated mostly by the same kind of pollinators, which are commonly small polylectic insects. The main pollinators are four small bees (Andrena knuthi, A. minutula, Halictus aerarius, Lasioglossum sp.) and three syrphid flies (Paragus haemorrhous, Sphaerophoria macrogaster, S. philanthus). The total number of insect visitors in D. chrysantha was 60 species, while in D. indica there were 51. There was no significant difference in the visitors to the two Duchesnea species, therefore, the adaptive meaning of the presence of nectar guides was not determined in Duchesnea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1442-1984.1996.tb00143.x
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular methods of analysing bacterial diversity: the case of Rhizobia (1992)
    Springer
    Biodiversity and conservation 1 (1992), S. 237-249 
    Details
    ISSN: 1572-9710
    Keywords: 16S rRNA ; Rhizobium ; Bradyrhizobium ; bacterial diversity ; DNA-DNA homology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution of rhizobia, bacteria which nodulate the roots of leguminous plants, was surveyed for 91 species of the familyLeguminosae. A total of 117 strains of rhizobia were isolated, and 28 strains were obtained from culture collections. The sample total of 145 strains was discriminated by rapid ribosomal RNA (rRNA) sequencing. The partial sequences (157 bases from position (inEscherichia coli) 1220 to 1377 from 5′ end) of 16S rRNA revealed the presence of 16 groups in these rhizobia. Further, DNA-DNA homology studies suggested that the differences of the 16 groups were enough to justify establishing at least 16 species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693762
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Chromosome numbers of European blackberries (Rubus subg.Rubus, Rosaceae) (1995)
    Springer
    Plant systematics and evolution 198 (1995), S. 143-149 
    Details
    ISSN: 1615-6110
    Keywords: Rosaceae ; Rubus subg.Rubus ; Chromosome numbers ; Flora of Germany
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chromosome numbers are presented for 32 collections of 29 European blackberry species (Rubus subg.Rubus) from Germany. One species is triploid (2n = 21), 27 species are tetraploid, (2n = 28), and one species is pentaploid (2n = 35). Chromosome numbers are reported for the first time ofR. adspersus, R. amisiensis, R. calvus, R. conothyrsoides, R. contractipes, R. demissus, R. elegantispinosus, R. ferocior, R. foliosus, R. hypomalacus, R. leucandrus, R. nemorosus, R. platyacanthus, R. praecox, R. rhombifolius, andR. rhytidophyllus. Chromosome numbers forR. dasyphyllus, R. gelertii, R. glandithyrsos, R. lamprocaulos, R. lindebergii, R. macrophyllus, R. montanus, R. muenteri, R. pedemontanus, R. polyanthemus, R. senticosus, R. silvaticus, andR. vigorosus are confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985110
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