Resistance gene analogues identified through the NBS-profiling method map close to major genes and QTL for disease resistance in apple

• Published in: Theoretical and applied genetics 2005-02, Vol.110 (4), p.660-668
• Main Authors: Calenge, F, Linden, C.G. van der, Weg, E. van de, Schouten, H.J, Arkel, G. van, Denance, C, Durel, C.E
• Format: Article
• Language: English
• Subjects: Amino Acid Sequence; amino acid sequences; apples; arabidopsis; Binding sites; Biological and medical sciences; Chromosome Mapping; Chromosomes, Plant; Classical genetics, quantitative genetics, hybrids; co-localize; defense genes; disease resistance; Fundamental and applied biological sciences. Psychology; genes; Genes, Plant; Genetic Markers; genetic techniques and protocols; Genetics; Genetics of eukaryotes. Biological and molecular evolution; Genome, Plant; Genomics; homologs; Life Sciences; major genes; Malus - genetics; Malus domestica; mildew resistance; Molecular Sequence Data; nucleotide-binding site profiling; Plant diseases; Plant Diseases - genetics; plant pathogenic fungi; plant proteins; Podosphaera leucotricha; potato; progeny; Pteridophyta, spermatophyta; Quantitative Trait Loci; resistance gene analogues; scab resistance; Vegetals; Venturia inaequalis
• ISSN: 0040-5752; 1432-2242
• DOI: 10.1007/s00122-004-1891-6

We used a new method called nucleotide-binding site (NBS) profiling to identify and map resistance gene analogues (RGAs) in apple. This method simultaneously allows the amplification and the mapping of genetic markers anchored in the conserved NBS-encoding domain of plant disease resistance genes. Ninety-four individuals belonging to an F1 progeny derived from a cross between the apple cultivars 'Discovery' and 'TN10-8' were studied. Two degenerate primers designed from the highly conserved P-loop motif within the NBS domain were used together with adapter primers. Forty-three markers generated with NBS profiling could be mapped in this progeny. After sequencing, 23 markers were identified as RGAs, based on their homologies with known resistance genes or NBS/leucine-rich-repeat-like genes. Markers were mapped on 10 of the 17 linkage groups of the apple genetic map used. Most of these markers were organized in clusters. Twenty-five markers mapped close to major genes or quantitative trait loci for resistance to scab and mildew previously identified in different apple progenies. Several markers could become efficient tools for marker-assisted selection once converted into breeder-friendly markers. This study demonstrates the efficiency of the NBS-profiling method for generating RGA markers for resistance loci in apple.