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  • 1
    Electronic Resource
    Electronic Resource
    The evolution of fraction I protein during the origin of a new species ofNicotiana (1975)
    Springer
    Journal of molecular evolution 7 (1975), S. 59-64 
    Details
    ISSN: 1432-1432
    Keywords: Fraction I Protein ; Ribulose Diphosphate Carboxylase ; Nicotiana ; Origin of Species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The polypeptide composition of Fraction I protein fromNicotiana digluta, a synthetic species which arose by chromosome doubling following the interspecific hybridization ofN.glutinosa andN.tabacum, has been examined by isoelectric focusing. The composition of the protein fromN.digluta, which was identical to the protein from the infertile F1 hybridN.glutinosa xN.tabacum, showed 3 polypeptides in the large subunit and 4 polypeptides in the small subunit. The large subunit polypeptides were identical to those fromN.glutinosa, the maternal parent in the original hybridization, whereas the small subunit polypeptides were a composite of the small subunit polypeptides from bothN.glutinosa andN.tabacum. This analysis demonstrates how the polypeptide composition of Fraction I protein evolves during the origin of new species ofNicotiana.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01732179
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  • 2
    Electronic Resource
    Electronic Resource
    Polypeptide composition of fraction I protein from Nicotiana glauca and from cultivars of Nicotiana tabacum, including a male sterile line (1975)
    Springer
    Biochemical genetics 13 (1975), S. 771-778 
    Details
    ISSN: 1573-4927
    Keywords: fraction I protein ; ribulose diphosphate carboxylase ; Nicotiana ; tobacco ; male sterility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The polypeptide compositions of fraction I protein isolated from six collections of Nicotiana glauca and from ten cultivars of N. tabacum, as well as a polyploid series and a male sterile line, have been analyzed by isoelectric focusing in polyacrylamide gel slabs containing 8 m urea. Apart from the male sterile line, none of the plants showed any variation from the species pattern of polypeptides. Fraction I protein from the male sterile Burley 21 cultivar of N. tabacum contained the two small subunit polypeptides of N. tabacum and the three large subunit polypeptides of an Australian species, probably N. megalosiphon. This indicates a changed chloroplast genome in the male sterile line in comparison to the normal fertile N. tabacum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484408
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  • 3
    Electronic Resource
    Electronic Resource
    Differentiation of Fraction 1 protein in relation to age and distribution of Angiosperm groups (1981)
    Springer
    Plant systematics and evolution 138 (1981), S. 89-113 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Nicotiana ; Gossypium ; Lemnaceae ; Fraction 1 protein ; differentiation and age of taxa ; migration to Australia ; land connections ; long distance dispersal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Fraction 1 protein (F-1-protein) (ribulose bisphosphate carboxy-lase-oxygenase) contained inLemnaceae has been evolving for at least 50 million years because fossils of these plants have been identified in strata belonging to the Upper Cretaceous. Electrofocusing F-1-protein resolves the large subunit polypeptides coded by extranuclear DNA and the small subunit polypeptides coded by nuclear DNA. Four differences affecting isoelectric points of the large subunit polypeptides and eight affecting the small subunit polypeptides are now present among eleven species representing the four genera comprising theLemnaceae. In comparison, four differences in the large and 13 in the small subunit polypeptides exist among 63 species ofNicotiana; four differences in the large and eight differences in the small subunit polypeptides exist among 19 species ofGossypium. The number of differences in F-1-protein composition being of the same order of magnitude for the generaNicotiana, Gossypium, and the familyLemnaceae, we infer that these Angiosperms are of similar antiquity. Nicotiana species indigenous to Australia and Africa contain F-1-proteins whose large subunit polypeptides are different but some of whose small subunit polypeptides are like those found in species from the Western Hemisphere. The same situation is found for the F-1-protein inGossypium. These results are in harmony with the view that species ofNicotiana andGossypium have arrived in Australia via former land connections between S. America, Antarctica, and Australia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984611
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