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  • 1
    Electronic Resource
    Electronic Resource
    Homoeologous relationships of Aegilops speltoides chromosomes to bread wheat (1998)
    Springer
    Theoretical and applied genetics 97 (1998), S. 181-186 
    Details
    ISSN: 1432-2242
    Keywords: Key words Homoeologous pairing ; Phylogenetic relationships ; Wheat ; Ae. speltoides ; C-banding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Homoeologous pairing at metaphase I was analysed in the standard-type, ph2b and ph1b hybrids of Triticum aestivum (AABBDD) and Aegilops speltoides (SS). Data from relative pairing affinities were used to predict homoeologous relationships of Ae. speltoides chromosomes to wheat. Chromosomes of both species, and their arms, were identified by C-banding. The Ae. speltoides genotype carried genes that induced a high level of homoeologous pairing in the three types of hybrids analyzed. All arms of the seven chromosomes of the S genome showed normal homoeologous pairing, which implies that no apparent chromosome rearrangements occurred in the evolution of Ae. speltoides relative to wheat. A pattern of preferential pairing of two types, A-D and B-S, confirmed that the S genome is very closely related to the B genome of wheat. Although this pairing pattern was also reported in hybrids of wheat with Ae. longissima and Ae. sharonensis, a different behaviour was found in group 5 chromosomes. In the hybrids of Ae. speltoides, chromosome 5B-5S pairing was much more frequent than 5D-5S, while these chromosome associations reached similar frequencies in the hybrids of Ae. longissima and Ae. sharonensis. These results are in agreement with the hypothesis that the B genome of wheat is derived from Ae. speltoides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050883
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  • 2
    Electronic Resource
    Electronic Resource
    Structural chromosome differentiation between Triticum timopheevii and T. turgidum and T. aestivum (1999)
    Springer
    Theoretical and applied genetics 98 (1999), S. 744-750 
    Details
    ISSN: 1432-2242
    Keywords: Key words Chromosome pairing ; Translocations ; T. timopheevii ; T. turgidum ; T. aestivum ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract.  Chromosome pairing at metaphase-I was analyzed in F1 hybrids among T. turgidum (AABB), T. aestivum (AABBDD), and T. timopheevii (AtAtGG) to study the chromosome structure of T. timopheevii relative to durum (T. turgidum) and bread (T. aestivum) wheats. Individual chromosomes and their arms were identified by means of C-banding. Homologous pairing between the A-genome chromosomes was similar in the three hybrid types AAtBG, AAtBGD, and AABBD. However, associations of B-G were less frequent than B-B. Homoeologous associations were also observed, especially in the AAtBGD hybrids. T. timopheevii chromosomes 1At, 2At, 5At, 7At, 2G, 3G, 5G, and 6G do not differ structurally from their counterpart in the A and B genomes. Thus, these three polyploid species inherited translocation 5AL/4AL from the diploid A-genome donor. Chromosome rearrangements that occurred at the tetraploid level were different in T. turgidum and T. timopheevii. Translocation 4AL/7BS and a pericentric inversion of chromosome 4A originated only in the T. turgidum lineage. The two lines of T. timophevii studied carry four different translocations, 6AtS/1GS, 1GS/4GS, 4GS/4AtL, and 4AtL/3AtL, which most likely arose in that sequence. These structural differences support a diphyletic origin of polyploid wheats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051130
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  • 3
    Electronic Resource
    Electronic Resource
    Homoeologous relationships of Triticum sharonense chromosomes to T. aestivum (1997)
    Springer
    Theoretical and applied genetics 94 (1997), S. 657-663 
    Details
    ISSN: 1432-2242
    Keywords: Key words C-banding ; Homoeologous pairing ; Homoeologous relationships ; Wheat ; Triticum sharonense
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Homoeologous pairing at metaphase I was analyzed in standard-type, ph2b, and ph1b hybrids of Triticum aestivum (common, bread or hexaploid wheat) and T. sharonense in order to establish the homoeologus relationships of T. sharonense chromosomes to hexaploid wheat. Chromosomes of both species, and their arms, were identified by C-banding. Normal homoeologous relationships for the seven chromosomes of the Ssh genome, and their arms, were revealed, which implies that no apparent chromosome rearrangement occurred in the evolution of T. sharonense relative to wheat. All three types of hybrids with low-, intermediate-, and high-pairing level showed preferential pairing between A-D and B-Ssh. A close relationship of the Ssh genome to the B genome of bread wheat was confirmed, but the results provide no evidence that the B genome was derived from T. sharonense. Data on the pairing between individual chromosomes of T. aestivum and T. sharonense provide an estimate of interspecific homoeologous recombination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050463
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of ph mutations on homoeolgous pairing in hybrids of wheat with Triticum longissimum (1995)
    Springer
    Theoretical and applied genetics 91 (1995), S. 1265-1270 
    Details
    ISSN: 1432-2242
    Keywords: C-banding ; Homoeologous pairing ; ph1b ; ph2b ; Wheat ; T. longissimum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Homoeologous pairing at metaphase-I was analyzed in wild-type, ph2b, and ph1b hybrids of wheat and a low-pairing type of T. longissimum in order to study the effect of ph mutations on the pairing of T. longissimum chromosomes with wheat chromosomes. Chromosomes of both species, and their arms, were identified by C-banding. The three types of hybrids, with low-, intermediate-, and high-pairing levels, respectively, exhibited a very similar pairing pattern which was characterized by the existence of two types, A-D and B-S1, of preferential pairing. These results confirm that the S1 genome of T. longissimum is closely related to the B genome of wheat. The possible use of ph1b and ph2b mutations in the transfer to wheat of genes from related species is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220939
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