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  • 1
    Electronic Resource
    Electronic Resource
    Introgression of the Vf source of scab resistance and distribution of linked marker alleles within the Malus gene pool (1999)
    Springer
    Theoretical and applied genetics 99 (1999), S. 1039-1046 
    Details
    ISSN: 1432-2242
    Keywords: Key words Apple ; Scab resistance ; Introgression ; Vf gene ; DNA markers ; Linkage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  A chromosomal region originating from Malus floribunda 821 confers Vf scab resistance to many isolates of Venturia inaequalis. Twelve DNA markers located in this region were used to scan the equivalent of 31 cM in 98 Malus accessions. This allowed a molecular diagnosis of a source of resistance in apple germplasm with the aid of pedigree information, and in the context of a limited marker survey representing other chromosomes. At least five marker alleles were present in all scab-resistant breeding selections or varieties arising from M. floribunda. The validity of findings based on RAPD markers was confirmed with SCAR assays and Southern-hybridisation experiments. The order of markers determined in previous mapping studies was confirmed and sets of recombinants identified that establish reliable fine-mapping orders within 0.7 cM of the resistance locus. None of the marker alleles were present in the accessions that are either susceptible or possess weak polygenic resistance to scab. The presence of some alleles corresponding to those present at least 5.3 cM from Vf in M. floribunda was detected in some accessions. Other major sources of scab resistance do not appear to possess alleles in common with the Vf region, which will simplify future allelism tests. The results are discussed in the context of the introgression of resistance loci together with marker-assisted selection. The use of breeding pedigrees to assist in fine-scale mapping and map-based cloning is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051412
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  • 2
    Electronic Resource
    Electronic Resource
    Construction of a 550 kb BAC contig spanning the genomic region containing the apple scab resistance gene Vf (1999)
    Springer
    Molecular genetics and genomics 262 (1999), S. 884-891 
    Details
    ISSN: 1617-4623
    Keywords: Key wordsVf ; Malus×domestica ; Resistance gene ; Chromosome walking ; Inverse PCR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A positional cloning project was started in apple with the aim of isolating the Vf resistance gene of Malus floribunda 821. Vf confers resistance against apple scab, the most important disease in apple orchards. A chromosome walk starting from two molecular markers (M18-CAPS and AM19-SCAR) flanking Vf was performed, using a bacterial artificial chromosome (BAC) library containing inserts of the cultivar Florina, which is heterozygous for Vf. Thirteen BAC clones spanning the region between the two markers were identified in nine chromosome walking steps. The size of the resulting contig is approximately 550 kb. In order to map the Vf region in more detail, we analyzed over 2000 plants from different populations segregating for Vf with markers produced from BAC end sequences. In this way, we were able to restrict the possible location of the Vf gene to a minimum of five clones spanning an interval of approximately 350 kb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004380051154
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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