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  • 1
    Electronic Resource
    Electronic Resource
    Mapping a novel heat-stable resistance to Meloidogyne in Lycopersicon peruvianum (1999)
    Springer
    Theoretical and applied genetics 98 (1999), S. 274-280 
    Details
    ISSN: 1432-2242
    Keywords: Key words Heat-sensitivity ; Virulence ; Tomato ; Root-knot nematodes ; Mapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The root-knot nematode heat-stable resistance locus from L. peruvianum LA2157 was mapped on chromosome 6. All wild tomato LA2157 entries and the LA2157 S1 progeny tested were resistant to Mi-avirulent Meloidogyne spp. isolates at 32°C, indicating that the self-compatible accession is homozygous for heat-stable nematode resistance. The novel resistance locus was mapped on a RFLP linkage map; this map was based on a segregating F2 population obtained from the interspecific F1 between L. esculentum cv ‘Solentos’ and L. peruvianum LA2157. The inheritance of the heat-stable resistance was evaluated in 100 F3 lines derived from one F1 interspecific hybrid. The genotype of the resistance locus of the individual F2 plants was based on the phenotypic classification of their F3 lines, and the data were used to map the resistance locus on the arm of chromosome 6 with the closest linkage to TG178. The position of the novel heat-stable resistance of LA2157 was localized in the resistance genes’ cluster close to the location of gene Mi-1. Cuttings of the F3 lines expressed resistance to Mi-1-avirulent M. incognita and M. javanica biotypes at 25°C and at 32°C (a temperature at which Mi-1 resistance is not expressed). There was no difference in the segregating population for expression of heat-unstable resistance and heat-stable resistance to Mi-1-avirulent Meloidogyne spp. However, LA2157 and cuttings of the above F3 lines were susceptible to a Mi-1-virulent M. incognita isolate at 30°C and to a M. hapla isolate at 25°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051068
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  • 2
    Electronic Resource
    Electronic Resource
    Aligning male and female linkage maps of apple (Malus pumila Mill.) using multi-allelic markers (1998)
    Springer
    Theoretical and applied genetics 97 (1998), S. 60-73 
    Details
    ISSN: 1432-2242
    Keywords: Key wordsMalus pumila Mill ; Molecular linkagemap ; Marker-assisted selection ; Fruit tree breeding ; Outbred progeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Linkage maps for the apple cultivars ‘Prima’ and ‘Fiesta’ were constructed using RFLP, RAPD, isozyme, AFLP, SCAR and microsatellite markers in a ‘Prima’בFiesta’ progeny of 152 individuals. Seventeen linkage groups, putatively corresponding to the seventeen haploid apple chromosomes, were obtained for each parent. These maps were aligned using 67 multi-allelic markers that were heterozygous in both parents. A large number of duplicate RFLP loci was observed and, in several instances, linked RFLP markers in one linkage group showed corresponding linkage in another linkage group. Distorted segregation was observed mainly in two regions of the genome, especially in the male parent alleles. Map positions were provided for resistance genes to scab and rosy leaf curling aphid (Vf and Sd 1, respectively) for the fruit acidity gene Ma and for the self-incompatibility locus S. The high marker density and large number of mapped codominant RFLPs and some microsatellite markers make this map an ideal reference map for use in other progenies also and a valuable tool for the mapping of quantitative trait loci.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050867
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  • 3
    Electronic Resource
    Electronic Resource
    Three QTLs from Lycopersicon peruvianum confer a high level of resistance to Clavibactermichiganensis ssp. michiganensis (1999)
    Springer
    Theoretical and applied genetics 99 (1999), S. 1068-1074 
    Details
    ISSN: 1432-2242
    Keywords: Key words Bacterial canker ; L. peruvianum ; Restriction fragment length polymorphism (RFLP) ; Sequence characterised amplified region (SCAR) ; Quantitative trait locus (QTL)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Lycopersicon peruvianum LA2157 originates from 1650 m above sea level and harbours several beneficial traits for cultivated tomatoes such as cold tolerance, nematode resistance and resistance to bacterial canker (Clavibacter michiganensis ssp. michiganensis). In order to identify quantitative trait loci (QTLs) for bacterial canker resistance, a QTL mapping approach was carried out in an F2 population derived from the interspecific F1 between Lycopersicon esculentum cv Solentos and L. peruvianum LA2157. Three QTLs for resistance mapped to chromosomes 5, 7 and 9 respectively. The resistance loci were additive and co-dominant with the QTL on chromosome 7 explaining the largest part of the variation for resistance in the F2 population. The combination of this QTL with either of the other two QTLs conferred a resistance similar to the level in the resistant parent L. peruvianum. Some RFLP markers flanking this QTL on chromosome 7 were converted into SCAR markers allowing efficient marker-assisted selection of plants with high resistance to bacterial canker.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051416
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  • 4
    Electronic Resource
    Electronic Resource
    An integrated high-density RFLP-AFLP map of tomato based on two Lycopersicon esculentum×L. pennellii F2 populations (1999)
    Springer
    Theoretical and applied genetics 99 (1999), S. 254-271 
    Details
    ISSN: 1432-2242
    Keywords: Key words Molecular markers ; Integrated linkage map ; Tomato ; Lycopersicon species ; AFLP ; RFLP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Two independent F2 populations of Lycopersicon esculentum×L. pennellii which have previously been investigated in RFLP mapping studies were used for construction of a highly saturated integrated AFLP map. This map spanned 1482 cM and contained 67 RFLP markers, 1078 AFLP markers obtained with 22 EcoRI+MseI primer combinations and 97 AFLP markers obtained with five PstI+MseI primer combinations, 231 AFLP markers being common to both populations. The EcoRI+MseI AFLP markers were not evenly distributed over the chromosomes. Around the centromeric region, 848 EcoRI+ MseI AFLP markers were clustered and covered a genetic distance of 199 cM, corresponding to one EcoRI+ MseI AFLP marker per 0.23 cM; on the distal parts 1283 cM were covered by 230 EcoRI+MseI AFLP markers, corresponding to one marker per 5.6 cM. The PstI/MseI AFLP markers showed a more even distribution with 16 PstI/MseI AFLP markers covering a genetic distance of 199 cM around the centromeric regions and 81 PstI/MseI AFLP markers covering a genetic distance of 1283 cM on the more distal parts, corresponding to one marker per 12 and 16 cM respectively. In both populations a large number of loci showed a significant skewed segregation, but only chromosome 10 loci showed skewness that was similar for both populations. This ultra-dense molecular-marker map provides good perspectives for genetic and breeding purposes and map-based cloning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051231
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  • 5
    Electronic Resource
    Electronic Resource
    AFLP linkage group assignment to the chromosomes of Allium cepa L. via monosomic addition lines (2000)
    Springer
    Theoretical and applied genetics 100 (2000), S. 480-486 
    Details
    ISSN: 1432-2242
    Keywords: Key words Allium cepa ; Monosomic addition lines ; AFLP™ ; CAPS ; Isozymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Two complete sets of Allium fistulosum L.– A. cepa monosomic addition lines (2n=2x+1=17) together with an AFLP linkage map based on a cross between A. cepa and A. roylei Stearn were used to re-evaluate the eight A. cepa linkage groups identified in the mapping study. The linkage groups could be assigned to individual, physical chromosomes. The low level of molecular homology between A. cepa and A. fistulosum enabled the identification of 186 amplified fragment length polymorphisms (AFLP™ markers) present in A. cepa and not in A. fistulosum with ten different primer combinations. With the monosomic addition lines the distribution of the markers over the eight chromosomes of A. cepa could be determined. Of these 186 AFLP markers 51 were absent in A. roylei and consequently used as markers in the mapping study (A. cepa ×A. roylei cross). Therefore, these 51 AFLP markers could be used to assign the eight A. cepa linkage groups identified in the mapping study to physical chromosomes. Seven isozyme and three CAPS markers were also included. Two of the linkage groups had to be split because they included two sets of markers corresponding to different chromosomes. A total of 20 (approx. 10%) of the A. cepa-specific AFLP markers were amplified in more than one type of the monosomic addition lines, suggesting unlinked duplications. The co-dominant isozyme and CAPS markers were used to identify the correspondence of linkage groupsoriginating from A. cepa or from A. roylei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050062
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