A detailed linkage map around an apple scab resistance gene demonstrates that two disease resistance classes both carry the Vf gene

1996 ◽  
Vol 93 (4) ◽  
pp. 485-493 ◽  
Author(s):  
S. E. Gardiner ◽  
H. C. M. Bassett ◽  
D. A. M. Noiton ◽  
V. G. Bus ◽  
M. E. Hofstee ◽  
...  
Keyword(s):  
Disease Resistance ◽  
Linkage Map ◽  
Resistance Gene ◽  
Apple Scab ◽  
Scab Resistance ◽  
Vf Gene

A detailed linkage map around an apple scab resistance gene demonstrates that two disease resistance classes both carry the V f gene

1996 ◽  
Vol 93 (4) ◽  
pp. 485-493 ◽  
Author(s):  
S. E. Gardiner ◽  
H. C. M. Bassett ◽  
D. A. M. Noiton ◽  
V. G. Bus ◽  
M. E. Hofstee ◽  
...  
Keyword(s):  
Disease Resistance ◽  
Linkage Map ◽  
Resistance Gene ◽  
Apple Scab ◽  
Scab Resistance ◽  
F Gene

scholarly journals Breakdown of the Scab Resistance Gene Vf in Apple Leads to a Founder Effect in Populations of the Fungal Pathogen Venturia inaequalis

2004 ◽  
Vol 94 (4) ◽  
pp. 364-369 ◽  
Author(s):  
Fabien Guérin ◽  
Bruno Le Cam
Keyword(s):  
Resistance Gene ◽  
Founder Effect ◽  
Allelic Variation ◽  
Venturia Inaequalis ◽  
Apple Scab ◽  
Apple Orchard ◽  
Scab Resistance ◽  
Vf Gene ◽  
Major Resistance Gene ◽  
High Level

The recent breakdown of Vf, a major resistance gene to apple scab, provided an opportunity to analyze a population genetic process within the matching virulent subpopulation of the fungus Venturia inaequalis. We utilized the amplified fragment length polymorphism technique and allelic variation at four microsatellite loci to assess genetic structure of 133 isolates of V. inaequalis from a single commercial apple orchard sampled from one cultivar carrying the Vf gene (Judeline) and three cultivars devoid of the Vf gene. Both analyses indicated a strong decrease of the genetic diversity among isolates from the Vf cultivar compared with the high level of diversity among isolates from the three other cultivars. This leads to a high genetic differentiation between virVf and avrVf groups (FST > 0.17). Analyses of the genetic distance between AFLP patterns based on the Jaccard index indicate that all virVf isolates could be assigned to a single clonal lineage. These results lead us to conclude that the clonal structure of the population isolated from the Vf cultivar is an example of a founder effect in response to a resistance gene breakdown and it is likely that this event occurred in the orchard during the sampling year.

scholarly journals A Novel Pear Scab (Venturia nashicola) Resistance Gene, Rvn3, from Interspecific Hybrid Pear (Pyrus pyrifolia × P. communis)

Plants ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 2632
Author(s):  
Sewon Oh ◽  
Hyeondae Han ◽  
Daeil Kim
Keyword(s):  
Resistance Gene ◽  
Resistance Genes ◽  
Interspecific Hybrid ◽  
Dominant Gene ◽  
Apple Scab ◽  
Scab Resistance ◽  
Hybrid Population ◽  
Pyrus Pyrifolia ◽  
Pear Scab ◽  
Venturia Nashicola

Asian pear scab is a fungal disease caused by Venturia nashicola. The identification of genes conferring scab resistance could facilitate the breeding of disease-resistant cultivars. Therefore, the present study aimed to identify a scab-resistance gene using an interspecific hybrid population ((Pyrus pyrifolia × P. communis) × P. pyrifolia). Artificial inoculation of V. nashicola was carried out for two years. The segregation ratio (1:1) of resistant to susceptible individuals indicated that resistance to V. nashicola was inherited from P. communis and controlled by a single dominant gene. Based on two years phenotypic data with the Kruskal–Wallis test and interval mapping, 12 common markers were significantly associated with scab resistance. A novel scab resistance gene, Rvn3, was mapped in linkage group 6 of the interspecific hybrid pear, and co-linearity between Rvn3 and one of the apple scab resistance genes, Rvi14, was confirmed. Notably, an insertion in pseudo-chromosome 6 of the interspecific hybrid cultivar showed homology with apple scab resistance genes. Hence, the newly discovered Rvn3 was considered an ortholog of the apple scab resistance gene. Since the mapping population used in the present study is a pseudo-BC1 population, pyramiding of multiple resistance genes to pseudo-BC1 could facilitate the breeding of pear cultivars with durable resistance.

scholarly journals Molecular markers linked to the apple scab resistance gene Vbj derived from Malus baccata jackii

2004 ◽  
Vol 109 (8) ◽  
pp. 1702-1709 ◽  
Author(s):  
M Gygax ◽  
L Gianfranceschi ◽  
R Liebhard ◽  
M Kellerhals ◽  
C Gessler ◽  
...  
Keyword(s):  
Molecular Markers ◽  
Resistance Gene ◽  
Apple Scab ◽  
Scab Resistance ◽  
Malus Baccata

scholarly journals Identification of functional apple scab resistance gene promoters

2005 ◽  
Vol 110 (6) ◽  
pp. 1119-1126 ◽  
Author(s):  
E. Silfverberg-Dilworth ◽  
S. Besse ◽  
R. Paris ◽  
E. Belfanti ◽  
S. Tartarini ◽  
...  
Keyword(s):  
Resistance Gene ◽  
Apple Scab ◽  
Scab Resistance ◽  
Gene Promoters

scholarly journals Identification and mapping of the novel apple scab resistance gene Vd3

2009 ◽  
Vol 5 (3) ◽  
pp. 475-482 ◽  
Author(s):  
J.M. Soriano ◽  
S.G. Joshi ◽  
M. van Kaauwen ◽  
Y. Noordijk ◽  
R. Groenwold ◽  
...  
Keyword(s):  
Resistance Gene ◽  
Apple Scab ◽  
Scab Resistance ◽  
The Novel

Construction of a 550 kb BAC contig spanning the genomic region containing the apple scab resistance gene Vf

1999 ◽  
Vol 262 (4-5) ◽  
pp. 884-891 ◽  
Author(s):  
A. Patocchi ◽  
B. A. Vinatzer ◽  
L. Gianfranceschi ◽  
S. Tartarini ◽  
H.-B. Zhang ◽  
...  
Keyword(s):  
Resistance Gene ◽  
Apple Scab ◽  
Genomic Region ◽  
Scab Resistance ◽  
Bac Contig

Exploitation of a marker dense linkage map of potato for positional cloning of a wart disease resistance gene

2005 ◽  
Vol 112 (2) ◽  
pp. 269-277 ◽  
Author(s):  
Bart Brugmans ◽  
Ronald G. B. Hutten ◽  
A. Nico O. Rookmaker ◽  
Richard G. F. Visser ◽  
Herman J. van Eck
Keyword(s):  
Disease Resistance ◽  
Linkage Map ◽  
Resistance Gene ◽  
Positional Cloning ◽  
Disease Resistance Gene ◽  
Wart Disease

Identification by genome scanning approach (GSA) of a microsatellite tightly associated with the apple scab resistance gene Vm

Genome ◽  
2005 ◽  
Vol 48 (4) ◽  
pp. 630-636 ◽  
Author(s):  
A Patocchi ◽  
M Walser ◽  
S Tartarini ◽  
G A.L Broggini ◽  
F Gennari ◽  
...  
Keyword(s):  
Molecular Markers ◽  
Linkage Group ◽  
Resistance Gene ◽  
Resistance Genes ◽  
Simple Sequence Repeat ◽  
Apple Scab ◽  
Scab Resistance ◽  
Sequence Repeat ◽  
Genome Scanning ◽  
Simple Sequence

For all known major apple scab resistance genes except Vr, molecular markers have been published. However, the precise position of some of these genes, in the apple genome, remains to be identified. Knowledge about the relative position of apple scab resistance genes is necessary to preliminarily evaluate the probability of success of their pyramidization. Pyramidization of different resistance genes into the same genotype is a reliable way to create cultivars with durable apple scab resistance. Applying the genome scanning approach (GSA), we identified the linkage group of the scab resistance gene Vm, derived from Malus micromalus, and we found a new molecular marker tightly associated with the gene. The simple sequence repeat Hi07h02, previously mapped on linkage group 17, cosegregates with the Vm gene (no recombinants in the 95 plants tested). The already published sequence-characterized amplified region Vm marker OPB12687 was found to be linked at about 5 cM from the resistance gene and, therefore, this marker also maps on linkage group 17 of apple. This is the first report of the discovery of a major apple scab resistance gene on linkage group 17. The advantages of using GSA for the identification of molecular markers for qualitative traits are discussed.Key words: Malus, Venturia inaequalis, mapping, simple sequence repeat.

scholarly journals Six promising selections from the Hungarian apple breeding program for multiple resistance

2005 ◽  
Vol 11 (3) ◽  
Author(s):  
M. Tóth
Keyword(s):  
Powdery Mildew ◽  
Fire Blight ◽  
Molecular Genetic ◽  
Apple Scab ◽  
Breeding Program ◽  
Scab Resistance ◽  
Multiple Resistance ◽  
Vf Gene ◽  
Apple Breeding ◽  
Malus Floribunda

An apple breeding program has been carried out at the Department of Fruit Science for more than a decade. Several apple selections have been released from the progenies of crosses in 1992 and 1993. Six candidates were submitted for national recognition out of the hybrids examined for more than a decade. The six selections are resistant against all the three most important apple diseases (apple scab, powdery mildew and fire blight). Scab resistance is controlled by the Vf gene originating from the species Malus floribunda 821 and transmitted by cultivar Prima. Heterozygote Vfvf genotype of the six cultivar candidates was proved by molecular genetic examinations of Dept. Genetics and Plant Breeding. Characteristics of these selections from 'Prima' progenies are shown on the base of our own observations.

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