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  • 1
    Electronic Resource
    Electronic Resource
    Fertility relationships ofGeranium (Geraniaceae): sectt.Ruberta, Anemonifolia, Lucida andUnguiculata (1987)
    Springer
    Plant systematics and evolution 155 (1987), S. 283-306 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Geraniaceae ; Geranium ; New hybrids ; interspecific fertility level as index of relationship ; autopolyploidy ; allopolyploidy ; asymmetry in reciprocal crossings ; Hogenboom's theory of incongruity ; climatic influence on crossing success
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cross-pollinations were carried out among 11 briefly described species ofGeranium. Eight species pairs produced hybrids, of which five had not been reported before. The close relationship ofG. purpureum, G. robertianum andG. rubescens (sect.Ruberta) was confirmed; they form a polyploid series (diploid, tetraploid and octoploid on base x = 16). ForG. canariense (sect.Anemonifolia), another octoploid on base x = 16, the results suggest greater affinity with the former section.G. maderense andG. palmatum of sect.Anemonifolia (2n = 68) are confirmed as closely related to each other.G. maderense produced hybrids withG. robertianum (2n = 64; sect.Ruberta) and withG. cataractarum (2n = 36; sect.Unguiculata). Meiosis in the latter hybrid suggests allopolyploidy between parents with 2n = 32 and 2n = 36. Whereas all these species clearly form a very close alliance,G. lucidum (sect.Lucida) andG. macrorrhizum andG. dalmaticum (both sect.Unguiculata), appear genetically more isolated from them. One plant ofG. macrorrhizum ×G. dalmaticum was raised. — In crosses where hybrids or non-germinating seeds resulted, the reciprocal cross in the majority of cases produced a greatly inferior result or none at all. This asymmetry of response could in some cases be explained by inability of pollentubes from short-styled parents to reach the ovary of a long-styled species and in others by a modification of Hogenboom's theory of incongruity, but neither explanation works for every case. In all our asymmetric results where the ploidy level differed the diploid was the successful female, not the tetraploid, as is usually the case. — Some variation in results from year to year could be attributed to weather conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00936305
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  • 2
    Electronic Resource
    Electronic Resource
    The chemotaxonomy ofGeranium (Geraniaceae) (1990)
    Springer
    Plant systematics and evolution 173 (1990), S. 1-15 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Geraniaceae ; Geranium ; Chemotaxonomy ; seed proteins ; essential oils ; nectar amino acids ; additivity in hybrids and allopolyploids ; chemical divergence and mutation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Relationships amongGeranium species constituting sectt.Anemonifolia, Lucida (monotypic) andRuberta together with representatives of sect.Unguiculata were investigated by gas-chromatographic study of essential oils, electrophoretic comparison of seed proteins and chromatographic separation of nectar amino acids. — Essential oil study gave little information.G. macrorrhizum (sect.Unguiculata) had far greater quantities of essential oils in its foliage than other species and differed from them qualitatively. — Species of sectt.Anemonifolia andRuberta, together withG. cataractarum (sect.Unguiculata), between them yielded 19 seed protein bands; the distribution of these indicated close relationship among the species and was consistent with hypotheses for the origin of certain species by alloand autopolyploidy partly within the group. Involvement of an unknown species in the origin of two allopolyploids was implied. Separate origins for the two octoploid species in this set are also inferred. In two instances there was evidence for the transformation of one band into another subsequent to the separation of related species. The inference of allopolyploidy was supported by the occurrence of additivity of parental bands shown by an artificial hybrid between two of the species. A model for the evolutionary divergence of the seed protein patterns is presented. Two species outside the above set appeared less closely related; they wereG. lucidum andG. macrorrhizum (sect.Unguiculata) and between them they showed 6 additional bands, four of which were shared. — Of 18 nectar amino acids found, 4 to 15 occurred in any one species, with low numbers (4 and 8) occurring in the most extreme inbreeders. The spectra of nectar amino acids of two hybrids showed additivity of those of the respective parents. The results echo rather closely those provided by seed proteins, but in the absence of data from outside the group their taxonomic significance is uncertain. However, the divergence between the two octoploids was again evident.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937759
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  • 3
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    Whole-exome sequencing of pancreatic cancer defines genetic diversity and therapeutic targets (2015)
    Springer Nature
    Details
    Publication Date: 2015-04-11
    Description: Article Diagnosis of pancreatic ductal adenocarcinoma (PDA) has poor long-term survival rates with limited therapy options. Here Witkiewicz et al. use microdissection and whole-exome sequencing to identify novel recurrent PDA mutations, highlighting the genetic diversity of this aggressive cancer. Nature Communications doi: 10.1038/ncomms7744 Authors: Agnieszka K. Witkiewicz, Elizabeth A. McMillan, Uthra Balaji, GuemHee Baek, Wan-Chi Lin, John Mansour, Mehri Mollaee, Kay-Uwe Wagner, Prasad Koduru, Adam Yopp, Michael A. Choti, Charles J. Yeo, Peter McCue, Michael A. White, Erik S. Knudsen
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 4
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    The Pollination of Flowers. (1974)
    Wiley
    Details
    Publication Date: 1974-03-01
    Print ISSN: 0022-0477
    Electronic ISSN: 1365-2745
    Topics: Biology
    Published by Wiley on behalf of British Ecological Society.
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  • 5
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    The Natural History of Pollination. (1997)
    Wiley
    Details
    Publication Date: 1997-01-01
    Print ISSN: 0012-9658
    Electronic ISSN: 1939-9170
    Topics: Biology
    Published by Wiley on behalf of Ecological Society of America.
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