Triticum turgidum L. 6A and 6B recombinant substitution lines: extended linkage maps and characterization of residual background alien genetic variation

Du, Changheng; Hart, G. E.

doi:10.1007/s001220050784

Cited by 10 publications

(4 citation statements)

References 17 publications

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“…1). In linkage mapping, loci detected by clone PSR899 were mapped in 6AS and/or 6DS of common wheat (Jia et al 1996;Marino et al 1996) and durum wheat (Blanco et al 1998;Du and Hart 1998); but they were not always mapped at the most-distal regions on linkage maps (Marino et al 1996;Du and Hart 1998).…”

Section: Resultsmentioning

confidence: 99%

“…3). This was also true when the order of loci was compared between this consensus map and other homoeologous group-6S linkage maps, such as the consensus genetic map of common wheat (Jia et al 1996) and barley (Qi et al 1996), and the 6A and 6B linkage maps of durum wheat (Du and Hart 1998) (data not shown).…”

Section: Comparison Of Physical Maps Of Wheat 6bs and Barley 6hsmentioning

confidence: 99%

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Comparison of homoeologous group-6 short arm physical maps of wheat and barley reveals a similar distribution of recombinogenic and gene-rich regions

Weng¹,

Lazar²

2002

Theor Appl Genet

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Eighty two new loci, mapped with 51 DNA clones, were added to the earlier deletion maps of the homoeologous group-6 short arms of hexaploid wheat ( Triticum aestivum L. em Thell., 2n = 6 x = 42, AABBDD). There are now 41, 56 and 52 loci mapped on deletion maps of 6AS, 6BS and 6DS, respectively. The linear order of orthologous loci in all three arms appears to be identical. The majority of the loci are located in the distal one-half of the three arms. There seems to be an increased marker/gene density from the centromeric to the telomeric regions in each arm, and the marker density in comparable physical regions is similar on all three maps. Recombination is not uniformly distributed along the chromosome arms; 60% of recombination occurs in the distal one-third of each arm. Recombination increases from the proximal region to the distal end in a nonlinear pattern. The distribution of loci and recombination along each of the three chromosome arms is highly correlated. Comparison of the 6BS deletion map from this study and a 6HS physical map of barley ( Hordeum vulgare L., 2n = 2 x = 14, HH) reveals a remarkably similar distribution of recombinogenic and gene-rich regions between the two chromosome arms, suggesting that the distribution patterns of genes may be conserved in the homoeologous group-6 chromosome short arms of wheat and barley. A consensus map of wheat group-6 short arms containing 46 orthologous loci was constructed. Comparison of the consensus map with published linkage maps of Triticeae group-6 chromosome short arms indicates that the linear order of the loci on the maps has been largely conserved. Evidence from this study does not support the existence of a 2BS-6BS reciprocal terminal translocation.

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Section: Resultsmentioning

confidence: 99%

Section: Comparison Of Physical Maps Of Wheat 6bs and Barley 6hsmentioning

confidence: 99%

Comparison of homoeologous group-6 short arm physical maps of wheat and barley reveals a similar distribution of recombinogenic and gene-rich regions

Weng¹,

Lazar²

2002

Theor Appl Genet

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“…The RFLP marker Xmwg798 was previously mapped in a durum wheat population. Du and Hart (1998) used the T. turgidum ssp. durum cultivar Langdon -T. turgidum ssp.…”

Section: Discussionmentioning

confidence: 99%

Identification and Mapping of Lr3 and a Linked Leaf Rust Resistance Gene in Durum Wheat

et al. 2007

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Leaf rust, caused by Puccinia triticina, is an important disease of durum wheat (Triticum turgidum ssp. durum) worldwide and can be controlled through the use of genetic resistance. Two leaf rust resistance genes in durum wheat lines, 'Camayo' and 'Storlom', were mapped to the long arm of chromosome 6B via amplified fragment length polymorphism (AFLP) analysis of bulked segregant populations. The leaf rust resistance gene in Storlom was identified to be Lr3 using a previously known co-segregating marker, Xmwg798. We validated a sequence tagged site (STS) version of this marker and identified three AFLP markers that were associated with the resistance gene in Camayo. The lack of recombination between the two resistance genes present in Storlom and Camayo, and comparison of the phenotypic and molecular characteristics of Camayo and the common wheat (T. aestivum) near-isogenic 'Thatcher' lines carrying Lr3a, Lr3ka and Lr3bg, indicated that the resistance in Camayo is conferred by a previously unknown gene adjacent to the Lr3 locus. The two closely linked genes confer resistance to P. triticina race BBG/BN prevalent on durum wheat in northwestern Mexico and should be deployed in combination with other resistance genes, to prolong their effectiveness.

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“…Therefore, little is known about the molecular aspects of the LDN-DS lines. Chromosomal rearrangements might have occurred during the development of the LDN-DS lines, and some CS genetic background might remain in the LDN-DS lines, in addition to the Dgenome chromosome pair (Du and Hart 1998;Chen et al 2006). These facts could limit the utility of the LDN-DS lines in genome mapping and the development of other genetic stocks.…”

Section: Introductionmentioning

confidence: 99%

Molecular characterization and chromosome-specific TRAP-marker development for Langdon durum D-genome disomic substitution lines

Klindworth

Shireen

et al. 2006

Genome

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Highly repetitive DNA sequences constitute a significant portion of most eukaryotic genomes, raising questions about their evolutionary origins and amplification dynamics. In this study, a novel chicken repetitive DNA family, the HinfI repeat, was characterized. The basic repeating unit of this family displays a uniform length of 770 bp, which was defined by the recognition site of HinfI. The HinfI repeat was specifically localized in the pericentric region of chromosome 4 by fluorescence in situ hybridization and constitutes 0.51% of the chicken genome. Interestingly, a chicken repeat 1 (CR1) element has been identified within this basic repeating unit. Like other CR1 elements, this CR1 element also displays typical retrotransposition characteristics, including a highly conserved 3' region and a badly truncated 5' end. This direct evidence from sequence analysis, together with our Southern blot results, suggests that the HinfI repeat may originate from a unique region containing a retrotransposed CR1 element.

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Triticum turgidum L. 6A and 6B recombinant substitution lines: extended linkage maps and characterization of residual background alien genetic variation

Cited by 10 publications

References 17 publications

Comparison of homoeologous group-6 short arm physical maps of wheat and barley reveals a similar distribution of recombinogenic and gene-rich regions

Comparison of homoeologous group-6 short arm physical maps of wheat and barley reveals a similar distribution of recombinogenic and gene-rich regions

Identification and Mapping of Lr3 and a Linked Leaf Rust Resistance Gene in Durum Wheat

Molecular characterization and chromosome-specific TRAP-marker development for Langdon durum D-genome disomic substitution lines

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