NDLI: Multiple field and glasshouse assessments increase the reliability of linkage mapping of the Vf source of scab resistance in apple

Content Provider	Springer Nature Link
Author	King, G. J. Alston, F. H. Brown, L. M. Chevreau, E. Evans, K. M. Dunemann, F. Janse, J. Laurens, F. Lynn, J. R. Maliepaard, C. Manganaris, A. G. Roche, P. Schmidt, H. Tartarini, S. Verhaegh, J. Vrielink, R.
Copyright Year	1998
Abstract	Apple scab, caused by the fungus Venturia inaequalis (Cke.) Wint., is an important disease in commercial apple production. A mapping population of 155 individuals, derived from a cross between the apple varieties ‘Prima’ (resistant)×‘Fiesta’ (susceptible), was scored for response to the disease in replicated field and glasshouse trials throughout Europe. Twenty data sets were selected and cluster analysis was used to form a consensus score for the population fitting a 1 : 1 segregation ratio of resistance:susceptibility. The progeny were scored with molecular markers. A detailed map covering 54 cM of the ‘Prima’ linkage group containing the Vf gene for scab resistance was constructed using 24 molecular markers linked to the resistance gene. One isoenzyme marker (Pgm-1), six RFLP markers and 17 RAPD markers formed a linkage group with the consensus measure of resistance to scab. Four marker bridges were established with the corresponding ‘Fiesta’ linkage group with additional markers (one isozyme, one RFLP, three RAPD and one AFLP). A low chi-square value indicated a good fit of the marker ordering, which was in close agreement with previously reported linkage positions for some of the markers and Vf. Differences were observed in the ability of different scoring methods to resolve susceptible and resistant classes. The results obtained for the consensus classification of resistance to scab for the population may suggest the presence of virulent inocula at some sites, which could overcome the Vf gene for resistance. The consequences of relying on individual scoring occasions for studying Vf scab resistance are discussed in the context of linkage analysis, conventional breeding selection, and marker-assisted selection.
Starting Page	699
Ending Page	708
Page Count	10
File Format	PDF
ISSN	00405752
Journal	Theoretical and Applied Genetics
Volume Number	96
Issue Number	5
e-ISSN	14322242
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-04-27
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Biotechnology Agronomy and Crop Science

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Saturation mapping of the apple scab resistance gene Vf using AFLP markers

Narrowing down the region of the Vf locus for scab resistance in apple using AFLP-derived SCARs

Introgression of the Vf source of scab resistance and distribution of linked marker alleles within the Malus gene pool

Identification of functional apple scab resistance gene promoters

Fine mapping of the Rvi5 (Vm) apple scab resistance locus in the ‘Murray’ apple genotype

Cloning and linkage mapping of resistance gene homologues in apple

Characterization of a new apple S-RNase allele and its linkage with the Rvi5 gene for scab resistance

Vr 2 : a new apple scab resistance gene

A major resistance gene from Russian apple ‘Antonovka’ conferring field immunity against apple scab is closely linked to the Vf locus

Multiple field and glasshouse assessments increase the reliability of linkage mapping of the Vf source of scab resistance in apple

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Saturation mapping of the apple scab resistance gene Vf using AFLP markers

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