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  • 1
    Electronic Resource
    Electronic Resource
    Quantitative trait loci influencing grain protein content in tetraploid wheats (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 115 (1996), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Seed storage protein content of durum wheat (Triticum turgidum var. durum) has an important effect on nutritional value and pasta-making characteristics. The objective of this study was to determine by association with genetic markers the number, chromosomal location, and magnitude of effect of quantitative trait loci (QTLs) controlling protein concentration in kernels. A set of 65 recombinant inbred lines (RIs) was developed by single seed descent from a cross between cultivated durum wheat cv. ‘Messapia’ (low protein content) and accession MG4343 of the wild tetraploid wheat var. dicoccoides (high protein content). This population was characterized for eight morphological, six storage protein, one isozyme and 124 RFLP loci. Field trials were conducted in one location in 1993 and two locations in 1994. QTLs were mapped by regression analysis on each marker locus for each location and for the average across environments. A total of six putative QTLs were located on chromosome arms 4BS, SAL, 6AS, 6BS and 7BS. The number and size of QTLs detected varied across environments. The marker with the highest r2 value per QTL in each environment and across environments was chosen for a multiple linear regression analysis, which explained 49.2- 56.4% of the phenotypic variation for protein content. Only some of the markers were found to be negatively associated with plant grain yield and/or seed weight in one or two of the environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1996.tb00925.x
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  • 2
    Electronic Resource
    Electronic Resource
    Genetic control of domestication traits in pearl millet (Pennisetum glaucum L., Poaceae) (2000)
    Springer
    Theoretical and applied genetics 100 (2000), S. 147-159 
    Details
    ISSN: 1432-2242
    Keywords: Key words Domestication ; Pennisetum glaucum ; Quantitative trait loci (QTL) ; RFLP mapping ; Wild relatives
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Quantitative trait loci (QTLs) controlling the morphological differences between pearl millet (Pennisetum glaucum ssp. glaucum) and its wild ancestor (Pennisetum glaucum ssp. monodii, form mollissimum) were investigated in a cultivated/wild F2 population by means of RFLP markers. The most critical adaptive changes resulting from the domestication process involved the spikelet structure: non-shedding seeds with reduced bracts and bristles and long involucral pedicel. Major differences also concerned characters describing the plant architecture, phenology and spike sizes. Many morphological differences could be attributed to the effect of a small number of loci with relatively large effects. These loci are mainly concentrated on four linkage groups (2, 5, 6 and 7). The loss of shedding ability, due to the absence of a functional abscission layer, is controlled by a single locus on linkage group 6 (al6). Genetic control of the other spikelet traits involved factors with large effects which are located in the region of linkage group 6 close to al6 and to an esterase gene, Esterase-E. Moreover, QTLs with large effects on plant and spike morphology traits such as plant height, number of spikes and weight of the spike were also mapped on linkage groups 6 and 7. This strong linkage of factors in the domestication syndrome may be involved in the maintenance of the phenotypic identity of wild and cultivated populations in sympatry. This result also brings new arguments in the understanding of the domestication process of this allogamous crop.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050020
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  • 3
    Electronic Resource
    Electronic Resource
    Comparative mapping reveals a complex relationship between the pearl millet genome and those of foxtail millet and rice (2000)
    Springer
    Theoretical and applied genetics 100 (2000), S. 190-198 
    Details
    ISSN: 1432-2242
    Keywords: Key words Colinearity ; Comparative maps ; Foxtail millet ; Grasses ; Oryza ; Pearl millet ; Pennisetum glaucum ; Rice ; Setaria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Comparative genetic maps were constructed of the pearl millet genome with foxtail millet and used to describe the homoeology between the genomes of pearl millet, foxtail millet and rice. Despite the close taxonomic relationship of pearl and foxtail millet, their genomes were highly, rearranged. A comparison of the millet and rice genomes indicated that most of these rearrangements were likely to have taken place in pearl millet. Two duplications were identified in pearl millet. A duplication between the distal segments of linkage groups 1 and 4 corresponds to the ancient duplication previously identified between rice chromosome arms 11S and 12S and foxtail millet chromosomes VII and VIII. The other putative duplication, also between regions of linkage groups 1 and 4, is likely to be species-specific. The exploitation of the comparative maps in pearl millet research is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050026
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  • 4
    Electronic Resource
    Electronic Resource
    Chromosomal location in wheat of the genes coding for the acyl carrier proteins I and III (1991)
    Springer
    Theoretical and applied genetics 82 (1991), S. 3-5 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231269
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  • 5
    Electronic Resource
    Electronic Resource
    Chromosomal location and variability in wheat, barley and rye of a wheat gene encoding a bZIP protein (EmBP-1) (1991)
    Springer
    Theoretical and applied genetics 82 (1991), S. 665-667 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227308
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  • 6
    Electronic Resource
    Electronic Resource
    Structural evolution of wheat chromosomes 4A, 5A, and 7B and its impact on recombination (1995)
    Springer
    Theoretical and applied genetics 91 (1995), S. 282-288 
    Details
    ISSN: 1432-2242
    Keywords: Crossing-over ; Genetic map ; Inversion ; Linkage ; Recombination ; T. aestivum ; T. monococcum ; Translocation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The construction of comparative genetic maps of chromosomes 4Am and 5Am of Triticum monococcum and chromosomes of homoeologous groups 4, 5 and 7 of T. aestivum has provided insight into the evolution of these chromosomes. The structures of chromosomes 4A, 5A and 7B of modern-day hexaploid bread wheat can be explained by a 4AL/5AL translocation that occurred at the diploid level and is present both in T. monococcum and T. aestivum. Three further rearrangements, a 4AL/7BS translocation, a pericentric inversion and a paracentric inversion, have taken place in the tetraploid progenitor of hexaploid wheat. These structural rearrangements and the evolution of chromosomes 4A, 5A and 7B of bread wheat are discussed. The presence of the 4AL/5AL translocation in several Triticeae genomes raises two questions — which state is the more primitive, and is the translocation of mono- or poly-phylogenetic origin? The rearrangements that have occurred in chromosome 4A resulted in segments of both arms having different positions relative to the telomere, compared to 4Am and to 4B and 4D. Comparisons of map length in these regions indicate that genetic length is a function of distance from the telomere, with the distal regions showing the highest recombination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220890
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  • 7
    Electronic Resource
    Electronic Resource
    Construction of RFLP-based maps of foxtail millet, Setaria italica (L.) P. Beauv. (1998)
    Springer
    Theoretical and applied genetics 96 (1998), S. 31-36 
    Details
    ISSN: 1432-2242
    Keywords: Key words Foxtail millet ; Genetic map ; Primary trisomics ; RFLP ; Setaria italica ; Setaria viridis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  An RFLP-based map consisting of 160 loci was constructed in an intervarietal cross of foxtail millet [Setaria italica (L.) P. Beauv.], Longgu 25×Pagoda Flower Green. The map comprises nine linkage groups, which were aligned with the nine foxtail millet chromosomes using trisomic lines, and spans 964 cM. The intraspecific map was compared to an interspecific map, constructed in a S. italica×S. viridis cross. Both the order of the markers and the genetic distances between the loci were highly conserved. Deviations from the expected 1 : 2 : 1 Mendelian segregation ratios were observed in both the intra- and inter-specific populations. The segregation data indicate that chromosome VIII in the Longgu 25×Pagoda Flower Green cross carries a gene that strongly affects gamete fertility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050705
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  • 8
    Electronic Resource
    Electronic Resource
    RFLP-based genetic map of rye (Secale cereale L.) chromosome 1R (1991)
    Springer
    Theoretical and applied genetics 82 (1991), S. 174-178 
    Details
    ISSN: 1432-2242
    Keywords: Rye ; Genetic mapping ; RFLP ; Storage protein ; Isozyme
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A map of chromosome 1R of rye was constructed using 16 molecular and biochemical loci. From long arm to short arm, known-function loci were placed in the order: XAdh — XLee — Glu-R1[Sec-3] — XPpdk-1R — XEm-1R-1 — XEm-1R-2 — Centromere — XNor-R1 —Gpi-R1 — XGli-R1 [Sec-1a] along with six anonymous genomic and cDNA clones from wheat. The map, which spans 106 cM with 12 loci clustered in a 15-cM region around the centromere, shows reasonably good agreement with previously published maps for the centromeric region, whereas the XNor-R1 — Gpi-R1 region gives a much larger distance than previously reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226209
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  • 9
    Electronic Resource
    Electronic Resource
    Comparative RFLP maps of the homoeologous group-2 chromosomes of wheat, rye and barley (1993)
    Springer
    Theoretical and applied genetics 85 (1993), S. 784-792 
    Details
    ISSN: 1432-2242
    Keywords: Wheat ; Rye ; Barley ; RFLP ; Biochemical markers ; Genetic maps
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Genetic maps of the homoeologous group-2 chromosomes were constructed, comprising 114 loci in wheat and 34 loci in rye. These include the genes coding for sucrose synthase, sedoheptulose-1,7-bisphosphatase, a bZIP protein (EmBP-1), a peroxidase and an abscisic acid-induced protein (#7). Overall, gene orders are highly conserved in the genomes of wheat, barley and rye, except for the distal ends of chromosome arms 2BS and 2RS, which are involved in interchromosomal, probably evolutionary, translocations. Clustering of loci in the centromeric regions of the maps, resulting from the concentration of recombination events in the distal chromosomal regions, is observed in wheat and rye, but not in barley. Furthermore, loci for which homoeoloci can be detected in rye and barley tend to lie in the centromeric regions of the maps, while non-homoeologous and wheat-specific loci tend to be more evenly distributed over the genetic maps. Mapping of the group-2 chromosomes in the intervarietal ‘Timgalen’ x ‘RL4137’ cross revealed that the T. timopheevi chromosome segment introgressed into chromosome 2B in ‘Timgalen’ is preferentially transmitted. Recombination is also greatly reduced in that segment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225020
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  • 10
    Electronic Resource
    Electronic Resource
    The distribution of RFLP markers on chromosome 2(2H) of barley in relation to the physical and genetic location of 5S rDNA (1993)
    Springer
    Theoretical and applied genetics 87 (1993), S. 177-183 
    Details
    ISSN: 1432-2242
    Keywords: Barley ; RFLP ; 5S rDNA ; Genetic mapping ; Physical mapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The 5S rDNA locus on the long arm of barley chromosome 2(2H) was genetically mapped in two crosses in relation to 30 other RFLP loci. Comparison of the genetic maps with the previously published physical position of the 5S rDNA, determined by in-situ hybridization, showed that there was a marked discrepancy between physical and genetic distance in both crosses, with recombination being less frequent in the proximal part of the arm. Pooled information from the present study and other published genetic maps showed that at least 26 of the 44 (59%) RFLPs that have been mapped on 2(2H)L lie distal to the 5S rDNA locus even though this region is only 27% of the physical length of the arm. The distribution of RFLP markers is significantly different from expected (P 〈 0.01), implying that the low-copy sequences used for RFLP analysis occur more frequently in distal regions of the arm and, or, that sequences in distal regions are more polymorphic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223762
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