Mapping Quantitative Field Resistance Against Apple Scab in a ‘Fiesta’ × ‘Discovery’ Progeny

Liebhard, R.; Koller, Bernhard; Patocchi, Andrea; Kellerhals, M.; Pfammatter, W.; Jermini, Mauro; Gessler, C.

doi:10.1094/phyto.2003.93.4.493

Cited by 78 publications

(54 citation statements)

References 36 publications

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“…However, a lot of strains were avirulent to 'Discovery' and virulent to 'Golden', showing that 'Discovery' possesses some additional resistance factors; this could explain why only 20% of the strains were virulent to Discovery. These results are concordant with those obtained by Liebhard et al (2003) and Calenge et al (2004), mapping the resistance to scab in two progenies of 'Discovery'. Sixty-seven percent of the strains were virulent to 'Fiesta'.…”

Section: Constitution Of the Core-collection Of V Inaequalissupporting

confidence: 90%

Variability of the Pathogenicity of Venturia Inaequalis in Europe

Parisi¹,

Fouillet²,

Schouten³

et al. 2004

Acta Hortic.

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In INTRODUCTIONThe overall objective of the DARE project was to improve the knowledge on the genomic organisation of resistance factors in apple, and to select cultivars with a broad spectrum of resistance. Hence, an important topic of the project was the study of the variability and the geographical distribution of the pathogenicity of V. inaequalis in Europe, with a strong focus on partial resistances.However, the Vf gene was given special attention because it is the main source of scab resistance used in apple breeding programmes. Since the first detection of strains of V. inaequalis virulent to this gene in Germany and England (Parisi et al., 1993;Roberts and Crute, 1994), several reports on the presence of these strains in Europe were published. Race 7 was detected in

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Section: Constitution Of the Core-collection Of V Inaequalissupporting

confidence: 90%

Variability of the Pathogenicity of Venturia Inaequalis in Europe

Parisi¹,

Fouillet²,

Schouten³

et al. 2004

Acta Hortic.

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“…SSR-based maps have been essential for identification and positional comparison of major genes and QTLs for scab, powdery mildew, and fire blight resistance (Durel et al , 2003Evans and James 2003;Liebhard et al 2003c;Calenge et al 2004;Gygax et al 2004;James et al 2004;Patocchi et al 2004;Tartarini et al 2004;Vinatzer et al 2004;Khan et al 2006) as well as morphological or physiological traits (Conner et al 1998;King et al 2000;Liebhard et al 2003a;Costa et al 2005). Recognition of SSR associations led to the identification of clusters of resistance genes (e.g., Bus et al 2004) and to the first integrated map of apple that reviews many papers with regard to the location of scab resistance genes .…”

Section: Introductionmentioning

confidence: 99%

Microsatellite markers spanning the apple (Malus x domestica Borkh.) genome

Silfverberg-Dilworth

Matasci

Weg³

et al. 2006

Tree Genetics & Genomes

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A new set of 148 apple microsatellite markers has been developed and mapped on the apple reference linkage map Fiesta x Discovery. One-hundred and seventeen markers were developed from genomic libraries enriched with the repeats GA, GT, AAG, AAC and ATC; 31 were developed from EST sequences. Markers derived from sequences containing dinucleotide repeats were generally more polymorphic than sequences containing trinucleotide repeats. Additional eight SSRs from published apple, pear, and Sorbus torminalis SSRs, whose position on the apple genome was unknown, have also been mapped. The transferability of SSRs across Maloideae species resulted in being efficient with 41% of the markers successfully transferred. For all 156 SSRs, the primer sequences, repeat type, map position, and quality of the amplification products are reported. Also presented are allele sizes, ranges, and number of SSRs found in a set of nine cultivars. All this information and those of the previous CH-SSR series can be searched at the apple SSR database (http://www. hidras.unimi.it) to which updates and comments can be added. A large number of apple ESTs containing SSR repeats are available and should be used for the development of new apple SSRs. The apple SSR database is also meant to become an international platform for coordinating this effort. The increased coverage of the apple genome with SSRs allowed the selection of a set of 86 reliable, highly polymorphic, and overall the apple genome well-scattered SSRs. These SSRs cover about 85% of the genome with an average distance of one marker per 15 cM.

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“…2 and Va from PI 172623 (Williams and Kuc 1969;Lespinasse 1989). All except Va have already been introduced into breeding lines, making them available for breeding purposes (Liebhard et al 2003). However, molecular markers are available for Vf, Vm (Cheng et al 1998), Vbj (Gygax 2004), Vr (Hemmat et al 2002 and for a second resistance gene, Vx, recently identified in Russian seedling (Hemmat et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Vr 2 : a new apple scab resistance gene

et al. 2004

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Reports from several European countries of the breakdown of the Vf resistance, the most frequently used source of resistance in breeding programs against apple scab, emphasize the urgency of diversifying the basis of apple scab resistance and pyramiding different apple scab resistances with the use of their associated molecular markers. GMAL 2473 is an apple scab resistant selection thought to carry the resistance gene Vr. We report the identification by BSA of three AFLP markers and one RAPD marker associated with the GMAL 2473 resistance gene. SSRs associated with the resistance gene were found by (1) identifying the linkage group carrying the apple scab resistance and (2) testing the SSRs previously mapped in the same region. One such SSR, CH02c02a, mapped on linkage group 2, co-segregates with the resistance gene. GMAL 2473 was tested with molecular markers associated with other apple scab resistance genes, and accessions carrying known apple scab resistance genes were tested with the SSR linked to the resistance gene found in GMAL 2473. The results indicate that GMAL 2473 does not carry Vr, and that a new apple scab resistance gene, named Vr 2 , has been identified.

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Mapping Quantitative Field Resistance Against Apple Scab in a ‘Fiesta’ × ‘Discovery’ Progeny

Cited by 78 publications

References 36 publications

Variability of the Pathogenicity of Venturia Inaequalis in Europe

Variability of the Pathogenicity of Venturia Inaequalis in Europe

Microsatellite markers spanning the apple (Malus x domestica Borkh.) genome

Vr 2 : a new apple scab resistance gene

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