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  • 1
    Electronic Resource
    Electronic Resource
    C-banding analysis on wild Emmer (Triticum dicoccoides Körn) strains with and without spontaneous reciprocal translocations (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 173-178 
    Details
    ISSN: 1432-2242
    Keywords: Triticum dicoccoides ; Reciprocal translocation ; Translocation breakpoint ; C-banding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract C-banding polymorphism was analyzed in eight strains of wild Emmer, Triticum dicoccoides Körn, which included six translocation homozygotes reported previously. Polymorphisms were detected in all of the strains examined, and the breakpoints of five spontaneous translocations were successfully identified by C-bands. Of the eight breakpoints that could be precisely identified, one was located in the centromeric region while the remaining seven were located in proximal to distal euchromatic regions. The two breakpoints of one translocation could only be approximately localized to proximal regions due to the scarcity of C-bands. The present results are in contrast with those observed on T. araraticum, another wild tetraploid wheat belonging to the Timopheevi group, in which most of the breakpoints were located in centromeric regions. In T. dicoccoides, the six translocation chromosome types were derived from the standard karyotype primarily by a mechanism other than centric breakage-fusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223373
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  • 2
    Electronic Resource
    Electronic Resource
    Numerical analyses of karyotypic diversity in the genusEupatorium (Compositae, Eupatorieae) (1990)
    Springer
    Plant systematics and evolution 170 (1990), S. 215-228 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Compositae ; Eupatorium ; Chromosomal distance ; chromosomal identity ; karyotype analysis ; statistics phenetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Somatic metaphase karyotypes were analyzed for 22 diploid species ofEupatorium. The karyotypic comparisons were made using two indices: minimal chromosomal distance (MCD), measuring overall dissimilarities, and chromosomal identity (CI), measuring number of morphologically identical chromosomes between species. The resulting phenograms from these indices are largely compatible. The 22 species cluster into four groups in the phenogram using MCD, and the grouping corresponds well with morphology or geographic distribution into the three N. American groupsEutrochium, Uncasia, Traganthes, and the E. Asian group. These results suggest that karyotypes in perennialEupatorium have been considerably conservative and changed not through large chromosomal mutations but through small chromosomal mutations gradually fixed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937705
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    Paper (German National Licenses)
    Fulltext
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