Disease-resistant apple cultivars developed from the apple breeding program at the University of Illinois / S.S. Korban and P.A. O'Connor.

Korban, S. S.; O'Connor, P. A.

doi:10.5962/bhl.title.45684

Cited by 6 publications

(10 citation statements)

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“…If this were the case, the presence of a QTL near Vf, which is carried by Prima, would be expected. This was not observed, possibly due to the absence of an actual common genetic basis between fire blight and scab resistance in the Vf-cultivars, as already proposed by Korban et al (1988). We were also unable to detect a minor QTL, or the link between the Vf genomic region and fire blight might be more complex involving, for instance, epistatic interactions between two or more loci.…”

Section: Discussioncontrasting

confidence: 49%

“…A few studies have identified a quantitative, most probably polygenic, determinism in several apple cultivars (Korban et al 1988; for a review see Lespinasse and Aldwinckle 2000). There is no known ''gene-for-gene '', R-Avr relationship for the interaction E. amylovora/ M. · domestica, and specific interactions between the pathogen genotypes and the apple cultivars have rarely been reported (Lespinasse and Aldwinckle 2000), which may be partly attributable to the quantitative nature of resistance.…”

Section: Introductionmentioning

confidence: 99%

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Identification of a major QTL together with several minor additive or epistatic QTLs for resistance to fire blight in apple in two related progenies

Calenge¹,

Drouet²,

Denancé³

et al. 2005

Theor Appl Genet

120

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Although fire blight, caused by the bacterium Erwinia amylovora, is one of the most destructive diseases of apple (Malus · domestica) worldwide, no major, qualitative gene for resistance to this disease has been identified to date in apple. We conducted a quantitative trait locus (QTL) analysis in two F 1 progenies derived from crosses between the cultivars Fiesta and either Discovery or Prima. Both progenies were inoculated in the greenhouse with the same strain of E. amylovora, and the length of necrosis was scored 7 days and 14 days after inoculation. Additive QTLs were identified using the MAPQTL software, and digenic epistatic interactions, which are an indication of putative epistatic QTLs, were detected by two-way analyses of variance. A major QTL explaining 34.3-46.6% of the phenotypic variation was identified on linkage group (LG) 7 of Fiesta in both progenies at the same genetic position. Four minor QTLs were also identified on LGs 3, 12 and 13. In addition, several significant digenic interactions were identified in both progenies. These results confirm the complex polygenic nature of resistance to fire blight in the progenies studied and also reveal the existence of a major QTL on LG7 that is stable in two distinct genetic backgrounds. This QTL could be a valuable target in marker-assisted selection to obtain new, fire blight-resistant apple cultivars and forms a starting point for discovering the function of the genes underlying such QTLs involved in fire blight control.

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Section: Discussioncontrasting

confidence: 49%

Section: Introductionmentioning

confidence: 99%

Identification of a major QTL together with several minor additive or epistatic QTLs for resistance to fire blight in apple in two related progenies

Calenge¹,

Drouet²,

Denancé³

et al. 2005

Theor Appl Genet

120

View full text Add to dashboard Cite

show abstract

“…Most of these programs involved the advanced selections of the PRI program (Janick 2002). In some cases, breeders attempted to diversify the sources of resistance and accumulate various functionally different resistances against scab (Boldyzheva et al 1985;Braniste, 1981;Denardi et al 1988;Fomina 1980;Korban et al 1988Korban et al , 1990Krasova 1981;Lespinasse et al 1976;Mehlenbacher et al 1988;Sedov and Zhdanov 1981;Zhdanov and Fomina 1981).…”

Section: Identification Of Vf Resistance and Its Use In Breedingmentioning

confidence: 99%

Vf scab resistance of Malus

Gessler

Pertot

2011

Trees

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The apple production in temperate regions with spring rains, the Scab caused by the fungus Venturia inaequalis is the most important constraint. To produce spotless apples and avoid damage that develops during storage, growers apply fungicide on a regular or weatherdetermined basis. All major apple cultivars are highly susceptible to this disease. To limit the need for fungicide applications, apple breeders are currently introgressing disease resistance from wild Malus accessions into commercial lines. The first attempts to do this were made 100 years ago. As apples are self-incompatible, pseudobackcrossing is used to eliminate unwanted traits from wild Malus and select new cultivars that are attractive to both producers and consumers. This process, from the first cross of a commercial cultivar with a wild, disease-resistant Malus, is extremely long due to apple's long juvenile phase, the need for more than seven backcross steps and the high heterozygosity of this genus. Therefore, most of today's scab-resistant cultivars rely on a single introduction of scab resistance from Malus floribunda 821, referred to as Vf. In this paper, we trace the history of Vf from its initial identification through its use in breeding and commercial production. We sum up the literature describing how and where Vf resistance has been overcome by new pathotypes of V. inaequalis. Finally, we describe the current knowledge of the genes behind Vf resistance, its mode of action and the use of Vf genes in gene technology.

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“…Apple trees have been grown in all continents except Antarctic and are well suited to the temperate climate regions and tropical regions with high altitudes (Korban, Skirvin 1984). Turkey is accepted as the genetic centre for other agricultural crops as well as fruit plants and is rich in different types of flora and cultivars of fruit trees.…”

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confidence: 99%

Determination of antioxidant activities of some apple cultivars

Pırlak¹,

Ünüvar²,

Ersoy³

2017

Hort. Sci. (Prague)

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This study was conducted in order to determine the antioxidant activities of certain apple varieties. 'Galaxy Gala' , 'Scarlet Spur' , 'Fuji' , 'Pink Lady' and 'Granny Smith' were characterized in this study. The antioxidant activities among the varieties were determined via three different procedures. Antiradical activity figures of the apple varieties were between 0.592 ('Galaxy Gala') and 0.802 ('Scarlet Spur'). Inhibition levels of chelating activity with Fe +2 varied between 40.20-55.50%; 'Scarlet Spur' and 'Pink Lady' extracts had the highest inhibition with 55.50% and 'Granny Smith' extract had the lowest with the level. Among the extracts showing H 2 O 2 clearance effect, Granny Smith (62.54%) and Scarlet Spur (44.67%) extracts had the highest inhibition levels. In this study conducted on apple varieties, total phenolic matter levels were determined in 'Scarlet

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Disease-resistant apple cultivars developed from the apple breeding program at the University of Illinois / S.S. Korban and P.A. O'Connor.

Cited by 6 publications

References 0 publications

Identification of a major QTL together with several minor additive or epistatic QTLs for resistance to fire blight in apple in two related progenies

Identification of a major QTL together with several minor additive or epistatic QTLs for resistance to fire blight in apple in two related progenies

Vf scab resistance of Malus

Determination of antioxidant activities of some apple cultivars

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